Relevant bibliographies by topics / Urea-formaldehyde resins

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
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  5. Conference papers

Academic literature on the topic 'Urea-formaldehyde resins'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Urea-formaldehyde resins"

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Park, Seongsu, Bora Jeong, and Byung-Dae Park. "A Comparison of Adhesion Behavior of Urea-Formaldehyde Resins with Melamine-Urea-Formaldehyde Resins in Bonding Wood." Forests 12, no. 8 (August 5, 2021): 1037. http://dx.doi.org/10.3390/f12081037.

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This paper reports a comparison of adhesion behavior of urea-formaldehyde (UF) with those of melamine-urea-formaldehyde (MU) resins in bonding wood by analyzing the results published in literatures. For this purpose, the adhesion behavior of UF resins prepared by blending low-viscosity resin (LVR) with high-viscosity resin (HVR) at five different blending and two formaldehyde/urea (F/U) molar ratios (1.0 and 1.2) was compared with those of two MUF resins synthesized by either simultaneous reaction (MUF-A resins) or multi-step reaction (MUF-B resins) with three melamine contents (5, 10, and 20 wt%). As the blending (LVR:HVR) ratio increased from 100:0 to 0:100, the viscosity and molar mass (Mw and Mn) of the blended UF resins increased while the gelation time decreased. The interphase features such as maximum storage modulus (E′max), resin penetration depth, and bond-line thickness of the UF resins increased to a maximum and then decreased as the blending ratio increased. In addition, both MUF-A and MUF-B resins also showed an increase in the Mw and Mn as the melamine content increased from 5% to 20%. However, the E′max, resin penetration depth, and bond-line thickness of the MUF resins decreased as the molar mass or melamine content increased. These results indicated that the adhesion of UF resins heavily depends on the interphase features while that of the MUF resins highly depends on the cohesion of the resins.
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Zhang, Ji Zhi, Xiao Ying Liu, Ying Ying Qiu, Xiao Mei Wang, Jian Zhang Li, and Shi Feng Zhang. "Performances of Modified Urea-Formaldehyde Resins for Bonding Plywood." Applied Mechanics and Materials 71-78 (July 2011): 3170–73. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3170.

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Urea-formaldehyde resin was modified by a modifier with different synthetic processes labelled as UFM1, UFM2, and UFM3 respectively. As a comparison, normal UF resin with a F/U molar ratio of 1.1 labelled as UF0 was synthesized. The thermal behavior of modified urea-formaldehyde resins was studied by TG-DTA techniques, and the properties of plywood bonded with the UFM resins were investigated. The conclusions were as follows: (1) the modifier used in this study could significantly reduce the free formaldehyde content of urea-formaldehyde resin and the formaldehyde emission of plywood; (2) The exothermic peak temperatures of DTA curve were 129.37, 125.05, 120.98, and 116.11 °C for UF0, UFM1, UFM2, and UFM3 respectively. (3) The plywood manufactured with UFM2 and UFM3 resins have high bonding strength (1.28MPa and 1.59MPa) and low formaldehyde emission value (E1 grade).
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Gao, Zhen Zhong, Li Tao Guan, Jin Sun, and Deng Yun Tu. "Preparation and Characteristic of Urea Formaldehyde Modified with Hexamethoxymethyl Melamine." Advanced Materials Research 160-162 (November 2010): 1245–52. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.1245.

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Hexamethoxymethyl melamine (HMMM) was used to modify UF resins to obtain good performance with low formaldehyde emission. The effect of urea to formaldehyde ratio, HMMM content on the properties of UF resin was studied in detail. The results suggested that urea to formaldehyde ratio to be 1:0.9 and 20% HMMM content is the optimum formulation to afford desired UF resin. The viscosity, solidification time, bond strength and formaldehyde emission of the modified UF resins were also studied. The results revealed that the performance of the modified UF achieved the chinese standard.
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Dong, Yao Hui, Qiang Gao, Yue Zhang, and Jian Zhang Li. "Study on Curing Behavior of Low Molar Ratio Urea-Formaldehyde Resins with Different Curing Agents." Advanced Materials Research 150-151 (October 2010): 965–68. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.965.

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In order to characterize the curing behavior of low molar ratio urea-formaldehyde (UF) resin, the curing time and thermal analysis in curing reaction of the UF resins and the bonding strength and formaldehyde emission of plywood bonded by five kinds of low molar ratio UF resins with six different curing agents were studied. The results indicated that the UF resins with the molar ratio of formaldehyde to urea more than 1.0 could get reasonable curing time. The heat enthalpy of UF resins significantly increased with the enhancing the acidity of curing agent. The plywood manufactured by the UF resins with 1.1 molar ratio showed much higher bonding strength and lower formaldehyde emission.
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Despres, A., and A. Pizzi. "Colloidal aggregation of aminoplastic polycondensation resins: Urea–formaldehyde versus melamine–formaldehyde and melamine–urea–formaldehyde resins." Journal of Applied Polymer Science 100, no. 2 (2006): 1406–12. http://dx.doi.org/10.1002/app.23230.

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Rogers-Gentile, V., G. C. East, J. E. Mcintyre, and P. Snowden. "Fibers from urea-formaldehyde resins." Journal of Applied Polymer Science 77, no. 1 (July 5, 2000): 64–74. http://dx.doi.org/10.1002/(sici)1097-4628(20000705)77:1<64::aid-app10>3.0.co;2-m.

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Wang, Hui, Jiankun Liang, Jun Zhang, Xiaojian Zhou, and Guanben Du. "Performance of urea-formaldehyde adhesive with oxidized cassava starch." BioResources 12, no. 4 (August 30, 2017): 7590–600. http://dx.doi.org/10.15376/biores.12.4.7590-7600.

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Urea-formaldehyde (UF) resins based on different formaldehyde/urea (F/U) mole ratio were synthesized with oxidized cassava starch added at the final stage of the resin synthesis process. The basic characteristics of resins including solid content, viscosity, and curing time were studied, and the dry and wet bond strengths were evaluated by producing a three layer plywood. Additionally, the curing characteristics of different resins were investigated via differential scanning calorimetry (DSC). Structural distributions between UF and oxidized cassava starch were examined via FT-IR and 13C NMR analysis. The results indicated that the addition of oxidized starch not only improved resin bond strength but also notably reduced the curing start temperature of modified resins. Furthermore, a negative relationship between F/U mole ratio and the extent of reduction was identified. The structural distribution of UF resins changed dramatically because of oxidation cassava starch addition, but the changes varied due to different F/U mole ratios.
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Zhang, Shi Feng, Jian Zhang Li, Ji Zhi Zhang, Yong Hua Li, and Qiang Gao. "Study on Properties of Modified Low Molar Ratio Urea-Formaldehyde Resins (I)." Advanced Materials Research 113-116 (June 2010): 2016–20. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.2016.

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For improving the performance of urea-formaldehyde (UF) resin, modified low molar ratio UF resins were developed to improve water resistance properties and reduce the formaldehyde emission of its bonded products. The effects of modifier feeding amount on the character of the cured resins were characterized by Fourier transform infrared spectroscopy (FTIR) measurement. The viscosity, pH value, solid content, free formaldehyde content, pot time, and curing time of the UF resins were also tested according to Chinese National Standards methods. The results show that the modified 1.00 molar ratio UF resins show lower free formaldehyde content and higher boiling-water-resistance comparing with unmodified ones. The boiling-water-resistant bonding strength of poplar plywood bonded with modified UF resin at 140 °C hot-press temperature can reach type I grade (100 °C water bath 3h) plywood requirement and the formaldehyde emission can meet the E0 grade plywood need.
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Hirata, Toshimi, Sumire Kawamoto, and Akio Okuro. "Pyrolysis of melamine–formaldehyde and urea–formaldehyde resins." Journal of Applied Polymer Science 42, no. 12 (June 20, 1991): 3147–63. http://dx.doi.org/10.1002/app.1991.070421208.

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Gonçalves, M., NT Paiva, JM Ferra, J. Martins, F. Magalhães, and L. Carvalho. "Classification of amino resins and formaldehyde near infrared spectra using K-nearest neighbors." Journal of Near Infrared Spectroscopy 27, no. 5 (July 8, 2019): 345–53. http://dx.doi.org/10.1177/0967033519861008.

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Amino resins are synthetic adhesives that can be divided into three major types: urea–formaldehyde (UF), melamine–urea–formaldehyde (MUF), or melamine–formaldehyde (MF). When less than 5% of melamine is added to a UF resin, the resin is called a melamine-fortified UF (mUF) resin. The extensive application of these resins in wood-based products is due to their many advantages: ease of use, strong bonding, resistance to wear and abrasion, heat resistance, and relatively low price. Several near infrared (NIR) models have been developed for this type of adhesives and have been used in industrial plants. However, the NIR spectroscopy is sensitive to the type of resin (UF, MUF, MF, or mUF) and even to the synthesis process, therefore different NIR models must be constructed per resin basis. This work presents two methods: (a) a method to distinguish the NIR spectra of formaldehyde from the NIR spectra of amino resins, and (b) a method to classify the NIR spectra of amino resins by class of resin. The method for the separation of formaldehyde from amino resins achieved 100% correct classification for the dataset used. This method was based on defining a baseline cutoff for the NIR spectra at which there were no amino resins bonds overlapping formaldehyde bonds. For the classification of amino resins, this work used the methodology of K-nearest neighbors, up to 91 neighbors, and principal component analysis, up to 10 principal components. The best classification method obtained an accuracy of 96.1% and can be used industrially to automatically select the most suitable NIR model for amino resins, helping to reduce the time taken for an NIR analysis and automatically preventing the wrong selection of NIR models by an operator.
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Dissertations / Theses on the topic "Urea-formaldehyde resins"

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Hill, Simon David Julian. "An investigation of process-structure correlations in urea-formaldehyde resins." Thesis, Lancaster University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239838.

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Nocanda, Xolani Wittleton. "A synthetic and spectrometric study of the initial phases in urea-formaldehyde resin formation." Thesis, Rhodes University, 1998. http://hdl.handle.net/10962/d1005048.

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In a series ofpreIiminary studies of urea-formaldehyde reactions, the influence of the U:F molar ratio, the temperature and the catalyst were investigated. Subsequently, in a more rigorous evaluation of the influence of four variables on urea-formaldehyde resin formation, viz., U:F molar ratio, pH, temperature and reaction time, a set of twenty reactions were performed using a statistical approach. The results indicate that high resin viscosity is best achieved by using a high U:F molar ratio (1:2) and conducting the reaction at 90°C. Several basic components produced in urea-formaldehyde reactions have been synthesised, characterised by NMR spectroscopy, silylated using bis(trimethylsilyl)trifluoroacetamide and analysed by low resolution mass spectrometry. The use oftriazones as cross-linking agents has been investigated, and a series of 5-substituted triazones have been prepared and their mass fragmentation patterns explored using a combination of low and high resolution mass spectrometry. In order to facilitate interpretation of ¹³C NMR data obtained for U-F resins, internal rotation in various urea derivatives was investigated using variable temperature ¹H and ¹³C NMR spectroscopic study. Signal splittings observed below 247 K have been rationalised in terms of various rotameric structures.
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Jeremejeff, Joakim. "Investigation of UF-resins - the Effect of the Formaldehyde/Urea Molar Ratio during Synthesis." Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146204.

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In this project, urea-formaldehyde (UF) resins were produced and investigated. UF resins are commonly used indoors as wood adhesives in, e.g. particle boards, in different furniture applications and flooring. UF resins are produced by alternating methylolation and condensation reactions, thus reacting urea and formaldehyde with each other and creating longer polymeric chains. The number of alternations, i.e. number of condensation reactions can be varied. The focus laid on the effect of the formaldehyde/urea molar ratio during synthesis. This includes the effect of the molar ratio on both the composition and structure and in turn their effect on the properties of the resin. UF resin was synthesized via two different methods. In method one, a reference adhesive was synthesized, this adhesive was produced using three condensation reactions. In method one, another resin was also produced using only two condensation reactions but with the same F/U molar ratios. In method two, only two condensations reactions were performed for each resin. In the start of the reaction, the F/U-molar ratio was varied in three different values. Towards the end, however, different amounts of urea were added to make sure that the final F/U-molar ration was kept constant. The results showed that the F/U molar ratio during synthesis will have an effect on both the composition of the resin and the structures being formed. With less urea added in the beginning as in the case with a high starting molar ratio, more dimethyl ether bridges and methylol groups, but less methylene bridges were formed in the end-product. This was formed together with a more branched UF structure with a higher polydispersity index. The reason for this probably originates from the more highly substituted amino groups formed due to the lower amount of urea in the beginning in the sample with a high F/U molar ratio. The composition and structure of the resin with a higher F/U molar ratio also seem to favor a stronger tensile strength. The increased amount of methylol groups and the increased PDI are thought to have a larger effect on the increased tensile strength. The shelf life of the finished resin also showed dependency with the F/U molar ratio, since resins produced with a low molar ratio gelled within 24h compared the two other variations of F/U ratios, where it took about 90 days to gel at the same temperature.
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Cui, Zhiying. "Denim Fiberboard Fabricated from MUF and pMDI Hybrid Resin System." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505281/.

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In this study, a series of denim fiberboards are fabricated using two different resins, malamine urea formaldehyde (MUF) and polymeric methylene diphenyl diisocyanate (pMDI). Two experimental design factors (1) adhesive content and (2) MUF-pMDI weight ratio, were studied. All the denim fiberboard samples were fabricated following the same resin blending, cold-press and hot-press procedures. The physical and mechanical tests were conducted on the fiberboard following the procedures described in ASTM D1037 to obtain such as modulus of elasticity (MOE), modulus of rupture (MOR), internal bond (IB), thickness swell (TS), and water absorption (WA). The results indicated that the MOE was significantly affected by both factors. IB was affected significantly by weight ratio of different glue types, with 17 wt% more MDI resin portion in the core layer of the denim boards, the IB for total adhesive content 15% fiberboard was enhanced by 306%, while for total adhesive content 25% fiberboard, enhanced by 205%. TS and WA, with higher adhesive content used in denim boards' fabrication, and more pMDI portion in the core layer of the boards, the boards' TS and WA was reduced by up to 64.2% and 78.8%, respectively.
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Fiala, Michal. "Chování lubrikační emulze a pryskyřice ve výrobě minerální plsti." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-216650.

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Diploma's thesis describes resolution of cause technological problems in mineral wool manufacturig in company Saint-Gobain Orsil. Main attention is paid to thermal and volatile process in mineral wool from filtration chamber and common commercial sales. Samples of mineral wool were characterizated by thermal analysis (simultaneous TG-DTA), effluent gas analysis (EGA), infrared spectroscopy (FT-IR), electron microscopy (SEM) and X-ray diffraction (XRD). Thermal analysis experiments was used to check thermal volatile processes. Technological problem of burning is linked with rise of isocyanic acid.
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Buzo, Ana Laura Soler Cunha. "Painéis aglomerados produzidos com partículas de pinus e bagaço de cana empregando-se ureia formaldeido e poliuretano à base de mamona." Ilha Solteira, 2018. http://hdl.handle.net/11449/157188.

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Orientador: Sérgio Augusto Mello da Silva
Resumo: O desenvolvimento de estudos para produção de derivados de madeira tem representado uma real alternativa para contribuir as políticas de sustentabilidade, principalmente de espécies arbóreas nativas. Nesse contexto, o reaproveitamento de resíduos lignocelulósicos tem contribuído como uma alternativa para a produção industrial de painéis de madeira. Dentro desse contexto este trabalho se constitui do estudo para produção e avaliação de painéis aglomerados, empregando-se partículas de bagaço de cana-de-açúcar (Saccharum officinarum) e partículas de madeira de pinus (Pinus taeda; Pinus elliottii) e utilizando-se dois tipos de aglutinantes, o Poliuretano derivado do óleo de mamona (PU-M) e a Resina Ureia-formaldeído (UF). Para produção dos painéis foram propostos diferentes tratamentos com variações entre as proporções de massas das partículas, densidade nominal dos painéis de 0,80 g/cm3 e pressão de prensagem de 50 kgf/cm2 durante 10 min. As misturas de partículas foram utilizadas com 10% de umidade para o adesivo PU-M e 3% de umidade para a resina UF ambos com um conteúdo de 10% em relação à massa seca das partículas. Para prensagem dos painéis com PU-M empregou-se 100 ºC e para os painéis com UF 130 ºC. Os painéis foram submetidos a ensaios para avaliação das propriedades físicas (densidade, umidade e inchamento) e mecânicas (módulo de elasticidade, módulo de ruptura à flexão e tração perpendicular) de acordo com a ABNT NBR 14810-1 e 2 (2013). Os resultados obtidos evidenciara... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The development of studies for the production of wood derivatives has represented a real alternative to improve sustainability policies, mainly of native tree species. In this context, the reuse of lignocellulosic waste has contributed as an alternative to the industrial production of wood panels. This way, this work aims to produce and evaluate chipboards using particles of sugarcane bagasse (Saccharum officinarum) and particles of pine wood (Pinus taeda; Pinus elliottii) and using two types of binders, the Polyurethane derived from castor oil (PU-Castor) and Urea formaldehyde resin (UF). Different treatments were proposed for the production of boards with variations between the particle mass ratios, panels’ nominal density of 0.80 g/cm3 and pressing pressure of 50 kgf/cm2 for 10 minutes. Particle mixtures were used at 10% moisture for the PU-Castor adhesive and 3% moisture for the UF resin both with a content of 10% relative to the dry mass of the particles. For the pressing of panels with PU-Castor was used 100 °C and of panels with UF was used 130 °C. The boards were submitted to tests to evaluate the physical properties (density, moisture and swelling after 24 hours) and mechanical (modulus of elasticity, modulus of resistance to bending and perpendicular traction) according to the ABNT NBR 14810-1 and 2 (2013). The results showed that it is possible to use particles from sugarcane bagasse and pine wood for high density chipboards production. It was found that the boards... (Complete abstract click electronic access below)
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Minutti, Fernanda Aparecida Alonge. "Uso de pena de galinha na produção de painéis para construção civil." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/154128.

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Submitted by Fernanda Aparecida Alonge Minutti (fer.alonge@gmail.com) on 2018-05-30T16:01:45Z No. of bitstreams: 1 Fernanda A A Minutti_Dissertação completa_FINAL.pdf: 6994835 bytes, checksum: ab3793efb49bc877a92e10fe9d2d04cd (MD5)
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O presente trabalho apresenta uma alternativa para a minimização do descarte atual, crescente e inadequado do resíduo agronômico pena de galinha (Chicken Feather). Assim, foram estabelecidos parâmetros para gerar um novo produto, painéis de compósitos, com adição de resina ureia-formaldeído, visando verificar as propriedades e possibilidades de aplicação deste produto na construção civil. Ao longo do levantamento bibliográfico, notou-se que a pena de galinha é um tema ainda pouco explorado em pesquisas, traduzindo-se em uma lacuna a ser preenchida. Foi escolhida a resina ureia-formaldeído por ser um componente chave muito utilizado na indústria de chapas particuladas de madeira, o que facilitaria na avaliação comparativa de desempenho do novo compósito. Durante a realização da etapa experimental, constatando-se uma grande dificuldade na trituração das penas, optouse por usá-las inteiras. Ao final desta etapa, a qualidade física das chapas foi insuficiente para a produção dos corpos de prova necessários à realização dos ensaios de caracterização física e mecânica, sendo direcionado aos ensaios de desempenho térmico, para aplicação deste compósito como isolante térmico em edificações. Com a realização destes ensaios, constatou-se o potencial de adequação do material para esta aplicação. Comparados com materiais para isolamento térmico existentes no mercado, os painéis com pena de galinha apresentaram desempenho compatível, bloqueando cerca de 20ºC de temperatura entre uma face e outra. Desta forma, conclui-se que a pena de galinha é um resíduo agronômico com considerável potencial de aproveitamento na produção de painéis, para uso como material isolante térmico em componentes para construção civil.
The present work presents an alternative for the minimization of current, increasing and inadequate disposal of agronomic chicken feather residue. Thus, parameters were established to generate a new product, composite panels, with addition of ureaformaldehyde resin, in order to verify the properties and possibilities of application of this product in civil construction. Throughout the bibliographical survey, it was noticed that the feather of chicken is a subject still little explored in researches, translating into a lacuna to be filled. The urea-formaldehyde resin was chosen as a key component widely used in the wood particleboard industry, which would facilitate the comparative evaluation of the new composite performance. During the realization of the experimental stage, it was verified a great difficulty in the crushing of the feathers, it was chosen to use them whole. At the end of this stage, the physical quality of the panels was insufficient for the production of the test specimens necessary for the physical and mechanical characterization tests, being directed to the thermal performance tests, for the application of this composite as thermal insulation in buildings. With the accomplishment of these tests, it was verified the potential of suitability of the material for this application. Compared with existing insulation materials on the market, the panels with chicken feather showed compatible performance, blocking about 20ºC of temperature between one face and another. Thus, it is concluded that the chicken feather is an agronomic residue with considerable potential for use in the production of panels, for use as thermal insulation material in components for civil construction.
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Zhou, Xiaojian. "Évolution des colles à panneaux bois extérieurs synthétiques (MUF), aux colles naturelles et soudage sans colles." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0035/document.

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Lors de cette étude, j'ai effectué des recherches sur trois sortes d'assemblages du bois : les colles naturelles, les colles synthétiques et le soudage sans colles, ceci dans le but d'améliorer les performances de fabrication des panneaux de particules, des panneaux contreplaqués, des lamellés-collés et des composites. Dans ce travail, le contenu d'étude inclut les éléments suivants : 1) L'assemblage des panneaux semi-extérieurs ou extérieurs par les colles naturelles : Trois types différents de tannins (les tannins hydrolysables de châtaigniers, les tannins condensations de pin radiata et les tannins condensations de mimosa) sont étudiés. 2) L'assemblage des panneaux extérieurs par les colles synthétiques : Différents types d'additifs (le nanoargile, des précurseurs oligomériques de poly (amine-ester) et glutaraldéhyde) pour améliorer leurs performances. La résine MUF (Mélamine-Urée-Formaldéhyde) est obtenue sous forme de poudre par séchage d'atomisation ainsi sa durée de vie est potentiellement infinie.3) L'assemblage des panneaux extérieurs par soudage sans colles : Deux matériaux (l'huile et la lignine acétylée) pour améliorer les résistances à l'eau. Toutes les propriétés physico-chimiques et mécaniques ont été étudiées en mettant en oeuvre des techniques d'analyse et d'évaluation telles que la thermomécanique TMA, la cristallographie aux rayons X (XRD), la résonance magnétique nucléaire 13C RMN, la spectrométrie de masse MALDI-TOF, et la fabrication des panneaux en laboratoire. Finalement, nous avons amélioré les caractéristiques des panneaux avec les colles ou sans colles et spécifiquement la résistance à l'eau pour une utilisation extérieure
In this studied, wood based composites were assembled with the natural adhesive (tannin adhesive), the synthesis adhesive (MUF) and the welding wood without adhesive. These wood composites include particleboard, plywood and glulam. We focus on these works as follows: 1) Three different types of tannins (chestnut hydrolysable tannins, pine condensation tannins and mimosa condensation tannins) as thermosetting or cold-setting adhesive were studied to assemble particleboard, plywood and glulam for application to semi-exterior or exterior. 2) The characteristics of MUF resins for particleboard applications have been improved through a number of additives (nanoclay, hyperbranched polymer and glutaraldehyde), the powder adhesive of MUF was obtained by spray-drying technologies, and it could be prolonger the shelf-life of MUF adhesive. It also can be application to exterior after enhancing. 3) The blockboard for application exterior was assembling by welded dowels, two differents materials (sun flower oil and acetylated lignin) were used to improve the water resistance. These physical, chemical and mechanical properties of these assemblages was investigated by implementing some techniques such as thermomechanical analysis (TMA), X-ray diffraction (XRD), nuclear magnetic resonance (13C NMR), matrix-assisted laser desorption/ionization mass spectroscometry (MALDI-TOF), and by manufacturing wood composites. Finally, the performances of these wood composites were apparent improved whether with the tannin adhesive, the MUF adhesive or the welding wood without adhesive, especially improved the water resistance of wood composites for exterior applications
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Mendoza, Carrión Maria J. "Studies on the structure and morphology of urea-formaldehyde resins." 1987. http://catalog.hathitrust.org/api/volumes/oclc/16520252.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1987.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 193-194).
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Chen, Ying-Chuan, and 陳盈全. "Synthesis and Properties of Urea- Bark Extracts- Formaldehyde Copolymer Resins." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/97129850790385529100.

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Books on the topic "Urea-formaldehyde resins"

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Roffael, Edmone. Formaldehyde release from particleboard and other wood based panels. Kuala Lumpur: Forest Research Institute Malaysia, 1993.

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2

Rossiter, Walter J. Urea-formaldehyde foam insulations: A review of their properties and performance. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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Rossiter, Walter J. Urea-formaldehyde foam insulations: A review of their properties and performance. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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Rossiter, Walter J. Urea-formaldehyde foam insulations: A review of their properties and performance. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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Rossiter, Walter J. Urea-formaldehyde foam insulations: A review of their properties and performance. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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Rossiter, Walter J. Urea-formaldehyde foam insulations: A review of their properties and performance. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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National Institute for Occupational Safety and Health. Unocal Corporation, Kenai, Alaska. [Atlanta, Ga.?]: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 1996.

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Health, National Institute for Occupational Safety and. Unocal Corporation, Kenai, Alaska. [Atlanta, Ga.?]: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 1996.

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National Institute for Occupational Safety and Health. Unocal Corporation, Kenai, Alaska. [Atlanta, Ga.?]: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 1996.

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Motter, William Kennon. The formation of the colloidal phase in low mole ratio urea-formaldehyde resins. 1990.

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Book chapters on the topic "Urea-formaldehyde resins"

1

Johns, William E., and A. K. Dunker. "Urea-Formaldehyde Resins." In ACS Symposium Series, 76–86. Washington, DC: American Chemical Society, 1986. http://dx.doi.org/10.1021/bk-1986-0316.ch007.

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Gooch, Jan W. "Urea-Formaldehyde Resins." In Encyclopedic Dictionary of Polymers, 784. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12391.

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Bährle-Rapp, Marina. "Urea/Melamine/Formaldehyde Resin." In Springer Lexikon Kosmetik und Körperpflege, 574. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_10899.

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Lin, Chia-feng, Olov Karlsson, George I. Mantanis, Dennis Jones, and Dick Sandberg. "Fire Retardancy and Leaching Resistance of Pine Wood Impregnated with Melamine Formaldehyde Resin in-Situ with Guanyl-Urea Phosphate/Boric Acid." In Wood & Fire Safety, 83–89. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41235-7_12.

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Silva, Diogo Aparecido Lopes, Natalia Crespo Mendes, Luciano Donizeti Varanda, Aldo Roberto Ometto, and Francisco Antonio Rocco Lahr. "Life Cycle Assessment of Urea Formaldehyde Resin: Comparison by CML (2001), EDIP (1997) and USEtox (2008) Methods for Toxicological Impact Categories." In Re-engineering Manufacturing for Sustainability, 529–34. Singapore: Springer Singapore, 2013. http://dx.doi.org/10.1007/978-981-4451-48-2_86.

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Fink, Johannes Karl. "Urea/Formaldehyde Resins." In Reactive Polymers Fundamentals and Applications, 179–92. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4557-3149-7.00005-x.

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Fink, Johannes Karl. "Urea/formaldehyde Resins." In Reactive Polymers Fundamentals and Applications, 283–98. Elsevier, 2005. http://dx.doi.org/10.1016/b978-081551515-9.50007-x.

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Fink, Johannes Karl. "Urea/Formaldehyde Resins." In Reactive Polymers: Fundamentals and Applications, 255–73. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-814509-8.00005-1.

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Guichard, G. "Urea–Formaldehyde Resins." In Four Carbon-Heteroatom Bonds, 1. Georg Thieme Verlag KG, 2005. http://dx.doi.org/10.1055/sos-sd-018-00943.

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"Urea–formaldehyde resins." In Encyclopedic Dictionary of Polymers, 1030. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_12154.

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Conference papers on the topic "Urea-formaldehyde resins"

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Mackevičius, Rimantas, Danutė Sližytė, Tatyana Zhilkina, and Vadim Turchin. "Investigation of influence of additives on properties of multi-molecular organic solutions used for permeation grouting." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.112.

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Permeation grouting for stabilization of dispersive sandy and gravely soils is in use from beginning of 19th century and has high importance for various underpinning, tunneling, and structural strengthening works. As materials for permeation grouting are applied not only cement mortar or silica gel in many compositions but multi-molecular organic solutions too. From multi-molecular organic solutions for permeation grouting are in use various synthetic resins such as acrylic, urea-formaldehyde, or other polymer resins. Urea-formaldehyde resin has right physical and mechanical properties for applying in soil stabilization but additives can change these properties. For example, additives can increase density, pH-rate, and gel-formation time of urea-formaldehyde resin. Additives can decrease viscosity of solutions based on urea-formaldehyde resin. Additives can improve environmental aspects of use of multi-molecular organic solutions for grouting of sandy soils. Long-time investigations of influence of additives on properties of multi-molecular organic solutions used for soil stabilization give good results for optimization of composition of materials for grouting.
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Quintana, A., L. López-Doval, R. Rodríguez, J. A. Souto, and J. J. Casares. "Risk analysis in the chemical industry: an urea-formaldehyde resins case." In RISK ANALYSIS 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/risk060041.

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Jovanović, Vojislav, Suzana Samaržija-Jovanović, Branka Petković, Tijana Jovanović, Gordana Marković, Milena Marinović-Cincović, and Vesna Teofilović. "The effect of UV-irradiation on the thermal stability of modified urea-formaldehyde resins with thermally activated montmorillonite." In RAD Conference. RAD Centre, 2021. http://dx.doi.org/10.21175/rad.abstr.book.2021.15.19.

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Murugan, M., V. K. Kokate, A. A. Athawale, and M. H. M. Alhousami. "Epoxy resin modified urea formaldehyde and silicon urea formaldehyde as microwave absorbers." In 2008 International Conference on Recent Advances in Microwave Theory and Applications (MICROWAVE). IEEE, 2008. http://dx.doi.org/10.1109/amta.2008.4763183.

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Shen Dejun, Kang Kai, Xue Weili, Chen Weiming, and Jiang Yueming. "Synthesis of a novel environmental protection urea-formaldehyde resin." In 2011 International Conference on Transportation and Mechanical & Electrical Engineering (TMEE). IEEE, 2011. http://dx.doi.org/10.1109/tmee.2011.6199643.

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Zhang, Shaobo, Yu Wang, and Jintian Huang. "Study on the process of Carbon Nanotubes modified Urea-Formaldehyde Resin." In 3rd International Conference on Material, Mechanical and Manufacturing Engineering (IC3ME 2015). Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/ic3me-15.2015.271.

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Lin, Shao-sen, Jun Yan, Hong-guang Li, and Shi-guo Du. "Inhibitor performance and the preparation study of urea formaldehyde resin matrix composite particle." In 6th International Conference on Mechatronics, Materials, Biotechnology and Environment (ICMMBE 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icmmbe-16.2016.60.

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Khan, Adnan, Amani Hassanein, Abdul Shakoor, Ramazan kahraman, Fatima Montemor, and Anwarul Hasan. "Hybrid Microcapsules Reinforced Smart Coatings for Corrosion Protection in Oil and Gas Industry." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0014.

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Corrosion is one of the critical causes of material loss in metal components. This research is focused on the synthesis, and electrochemical properties of polyelectrolyte layered microcapsules (PMCs) reinforced smart polymeric coating for corrosion protection of steel substrates. For this purpose, monolayer urea-formaldehyde microcapsules encapsulated with linalyl acetate (MLMCs) was synthesized by Insitu polymerization. In the next step, phenylthiourea (PTU) was loaded between the layers of polyelectrolytes; polyethylenimine (PEI) & sulfonated polyether ether ketone (SPEEK) on the surface of MLMCs using layer by layer technique. The MLMCs are sensitive to mechanical stress while the PTU in PMCs is triggered by pH stimulus. The newly designed PMCs has linalyl acetate in the core and PTU in the polyelectrolyte layers. Furthermore, 6 wt.% of both MLMCs and PMCs are dispersed in the epoxy resin and applied on the clean steel substrate. Performance comparison showed that the epoxy resin reinforced with PMCs demonstrate enhanced thermal, self-healing and electrochemical properties. This improved performance can be attributed to the efficient release of the self-healing agent and corrosion inhibitor from the PMCs. Conclusively, the epoxy coatings modified with PMCs can be a novel organic coating for the corrosion protection of oil and gas industries.
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Mostafa, Amany A., Khaled R. Mohamed, Tarek M. Dahy, and Gehan T. El-Bassyouni. "Characterization and In-Vitro Assessment of Nano-Hydroxyapatite Prepared by Polymeric Route." In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47056.

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Hydroxyapatite is the most used calcium phosphate in implant production. In this study a novel method for the preparation of nano-hydroxyapatite is described. A mixture of calcium chloride and potassium hydrogen phosphate were introduced to the urea-formaldehyde resin during formation. The obtained resin was precalcined at 450°C to get rid of the organic materials. The prepared powder was characterized using XRD, thermal analysis (DTA, TG), FT-IR, TEM and SEM supplemented with EDAX. In particular, the results of XRD show that the powder produced at 900°C was wholly formed of nano-hydroxyapatite. TEM reveals that nano-hydroxyapatite particles have spherical shape and their size was less than 50 nm in width. SEM confirms the fine nature of the produced powder. The dielectric constant increases with increasing temperature and decreases with increasing frequencies. The dielectric loss shows a relaxation peak, which shifts to the higher frequency region with increasing temperature, conforming to a Debye-type relaxation process. In-vitro results show that fine grains of acicular hydroxyapatite were formed by immersing disc in simulated body fluid solution (SBF) proving the apatite formation onto the surface. Future work recommends incorporation of the prepared nano-sized hydroxyapatite into biocompatible polymer for tissue engineering applications.
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Ho, C. J., and Chi-Ming Lai. "Thermal Performance of Water-Based Suspensions of Phase Change Nanocapsules in a Natural Circulation Loop." In ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/mnhmt2013-22015.

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Experiments were conducted to investigate the heat transfer characteristics of water-based suspensions of phase change nanocapsules in a natural circulation loop with mini-channel heat sinks and heat sources. A total of 23 and 34 rectangular mini-channels, each with width 0.8 mm, depth 1.2 mm, length 50 mm and hydraulic diameter 0.96 mm, were evenly placed on the copper blocks as the heat source and heat sink, respectively. The adiabatic sections of the circulation loop were constructed using PMMA tubes with an outer diameter of 6 mm and an inner diameter of 4 mm, which were fabricated and assembled to construct a rectangular loop with a height of 630 mm and a width of 220 mm. Using a core material of n-eicosane and a shell of urea-formaldehyde resin, the phase change material nanocapsules of mean particle size 150 nm were fabricated successfully and then dispersed in pure water as the working fluid to form the water-based suspensions with mass fractions of the nanocapsules in the range 0.1–1 wt.%. The results clearly indicate that water-based suspensions of phase change nanocapsules can markedly enhance the heat transfer performance of the natural circulation loop considered.
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