Se connecter

Bibliographies thématiques / Aromatic polyurethanes

Sommaire

Articles de revues
Thèses
Livres
Chapitres de livres
Actes de conférences
Rapports d'organisations

Littérature scientifique sur le sujet « Aromatic polyurethanes »

Auteur : Grafiati

Publié le 28 juin 2023

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Aromatic polyurethanes ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "Aromatic polyurethanes"

1

Morgan, Paul W. « Polyurethanes from aromatic bischlorformates ». Journal of Applied Polymer Science 40, n^o 910 (5 novembre 1990) : 1771–82. http://dx.doi.org/10.1002/app.1990.070400930.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

2

Chalid, Mochamad, Hans J. Heeres et Antonius A. Broekhuis. « A Study on the Structure of Novel Polyurethanes Derived from γ-Valerolactone-Based Diol Precursors ». Advanced Materials Research 789 (septembre 2013) : 274–78. http://dx.doi.org/10.4028/www.scientific.net/amr.789.274.

Texte intégral

Résumé :

As versatile biomass-based diol precursors, N,N'-1,2-ethanediylbis-(4-hydroxy-pentanamide) (1) and 4-hydroxy-N-(2-hydroxyethyl)-pentanamide (2) are potential monomers to synthesize novel polyurethanes through adding di-isocyanates. This study reported the structural analysis and molecular behavior of polyurethanes obtained from polymerization of the diol precursors with aliphatic and aromatic di-isocyanates (hexamethylene diisocyanate, HDI (3), and phenyl-diisocyanate, PDI (4)) in (N,N-dimethylacetamide (DMA) solvents with triethylamine (TEA) catalysts.1H-NMR,13C-NMR and Elemental Analysis confirmed structure of the polyurethanes built from both diols and di-isocyanates and FTIR indicated interaction among polyurethane molecules showed at lower wave numbers such as 2855-2976 cm-1for hydrogen-bonded NH groups and 1621-1643 cm-1for hydrogen-bonded C=O groups. Furthermore a study on influence of the inter-and intra-molecular hydrogen bonding on the thermal and mechanical properties of the polyurethanes would be an interesting investigation for the next study.

Styles APA, Harvard, Vancouver, ISO, etc.

3

Briz-López, Eva Marina, Rodrigo Navarro, Héctor Martínez-Hernández, Lucía Téllez-Jurado et Ángel Marcos-Fernández. « Design and Synthesis of Bio-Inspired Polyurethane Films with High Performance ». Polymers 12, n^o 11 (17 novembre 2020) : 2727. http://dx.doi.org/10.3390/polym12112727.

Texte intégral

Résumé :

In the present work, the synthesis of segmented polyurethanes functionalized with catechol moieties within the hard or the soft segment is presented. For this purpose, a synthetic route of a new catechol diol was designed. The direct insertion of this catechol-free derivative into the rigid phase led to segmented polyurethanes with low performance (σmax ≈ 4.5 MPa). Nevertheless, when the derivative was formally located within the soft segment, the mechanical properties of the corresponding functionalized polyurethane improved considerably (σmax ≈ 16.3 MPa), owing to a significant increase in the degree of polymerization. It is proposed that this difference in reactivity could probably be attributed to a hampering effect of this catecholic ring during the polyaddition reaction. To corroborate this hypothesis, a protection of the aromatic ring was carried out, blocking the hampering effect and avoiding secondary reactions. The polyurethane bearing the protected catechol showed the highest molecular weight and the highest stress at break described to date (σmax ≈ 66.1 MPa) for these kind of catechol-functionalized polyurethanes. Therefore, this new approach allows for the obtention of high-performance polyurethane films and can be applied in different sectors, benefiting from the molecular adhesion introduced by the catechol ring.

Styles APA, Harvard, Vancouver, ISO, etc.

4

Zahedifar, Pegah, Lukasz Pazdur, Christophe M. L. Vande Velde et Pieter Billen. « Multistage Chemical Recycling of Polyurethanes and Dicarbamates : A Glycolysis–Hydrolysis Demonstration ». Sustainability 13, n^o 6 (23 mars 2021) : 3583. http://dx.doi.org/10.3390/su13063583.

Texte intégral

Résumé :

The use of polyurethanes and, therefore, the quantity of its scrap are increasing. Considering the thermoset characteristic of most polyurethanes, the most circular recycling method is by means of chemical depolymerization, for which glycolysis is finding its way into the industry. The main goal of polyurethane glycolysis is to recover the polyols used, but only limited attempts were made toward recovering the aromatic dicarbamate residues and derivates from the used isocyanates. By the split-phase glycolysis method, the recovered polyols form a top-layer phase and the bottom layer contain transreacted carbamates, excess glycol, amines, urea, and other side products. The hydrolysis of carbamates results in amines and CO2 as the main products. Consequently, the carbamates in the bottom layer of polyurethane split-phase glycolysis can also be hydrolyzed in a separate process, generating amines, which can serve as feedstock for isocyanate production to complete the polyurethane material cycle. In this paper, the full recycling of polyurethanes is reviewed and experimentally studied. As a matter of demonstration, combined glycolysis and hydrolysis led to an amine production yield of about 30% for model systems. With this result, we show the high potential for further research by future optimization of reaction conditions and catalysis.

Styles APA, Harvard, Vancouver, ISO, etc.

5

Jayasuriya, A. C., S. Tasaka et N. Inagaki. « Pyroelectric properties of linear aromatic polyurethanes ». IEEE Transactions on Dielectrics and Electrical Insulation 3, n^o 6 (1996) : 765–69. http://dx.doi.org/10.1109/94.556557.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

6

Gouveia, Júlia Rocha, Cleber Lucius da Costa, Lara Basílio Tavares et Demetrio Jackson dos Santos. « Synthesis of Lignin-Based Polyurethanes : A Mini-Review ». Mini-Reviews in Organic Chemistry 16, n^o 4 (19 mars 2019) : 345–52. http://dx.doi.org/10.2174/1570193x15666180514125817.

Texte intégral

Résumé :

Lignin is a natural polymer composed primarily of phenylpropanoid structures with an abundance of reactive groups: aliphatic and aromatic hydroxyls, phenols, and carbonyls. Considering the large quantity of hydroxyl groups, lignin has significant potential as a replacement for petroleum-based polyols in polyurethane (PU) synthesis and as a value-added, renewable raw material for this purpose. Several methods of lignin-based polyurethane synthesis are reviewed in this paper for reactive and thermoplastic systems: direct lignin incorporation, chemical lignin modification and depolymerization. Despite the unmodified lignin low reactivity towards diisocyanates, its direct incorporation as polyol generates highly brittle PUs, but with proper performance when applied as adhesive for wood. PU brittleness can be reduced employing polyols obtained from lignin/chain extender blends, in which glass transition temperature (Tg), mechanical properties and PU homogeneity are strongly affected by lignin content. The potential applications of lignin can be enhanced by lignin chemical modifications, including oxyalkylation and depolymerization, improving polyurethanes properties. Another PU category, lignin- based thermoplastic polyurethane (LTPU) synthesis, emerges as a sustainable alternative and is also presented in this work.

Styles APA, Harvard, Vancouver, ISO, etc.

7

Mendelsohn, Morris A., Francis W. Navish et Dongsik Kim. « Characteristics of a Series of Energy-Absorbing Polyurethane Elastomers ». Rubber Chemistry and Technology 58, n^o 5 (1 novembre 1985) : 997–1013. http://dx.doi.org/10.5254/1.3536110.

Texte intégral

Résumé :

Abstract Compositional effects were measured on a series of polyurethanes prepared by extending MDI-terminated PTMG prepolymers with dihydric alcohols and MCHDI-terminated prepolymers with diamines. The tensile and compressive stiffness and hysteretic loss increased while the resilience decreased with a decrease in the isocyanate equivalent weight of the prepolymer. Polyol chain extenders having an aromatic structure provided greater rigidity and increase in temperature on compressive cycling than did their aliphatic counterparts. Structural linearity and symmetry of both the aliphatic and aromatic extenders promoted greater rigidity and resiliency and less damping. Although direct replacement of MDI with MCHDI gives softer polyurethanes, use of the aromatic diamine extenders with the MCHDI-terminated prepolymers gave materials displaying the least resilience and greatest rigidity under static test conditions and the highest increase in temperature on compressive cycling. However, a significant increase in the chain length of the aromatic diamine-extended prepolymer provided properties quite similar to those obtained with the aliphatic diol systems.

Styles APA, Harvard, Vancouver, ISO, etc.

8

Jourdain, Antoine, Iurii Antoniuk, Anatoli Serghei, Eliane Espuche et Eric Drockenmuller. « 1,2,3-Triazolium-based linear ionic polyurethanes ». Polymer Chemistry 8, n^o 34 (2017) : 5148–56. http://dx.doi.org/10.1039/c7py00406k.

Texte intégral

Résumé :

We report the synthesis and detailed characterization of a series of ionic polyurethanes issued from the polyaddition of a 1,2,3-triazolium-functionalized diol monomer having a bis(trifluoromethylsulfonyl)imide counter-anion with four aliphatic, cycloaliphatic or aromatic commercial diisocyanates.

Styles APA, Harvard, Vancouver, ISO, etc.

9

Rapone, Irene, Vincenzo Taresco, Valerio Di Lisio, Antonella Piozzi et Iolanda Francolini. « Silver- and Zinc-Decorated Polyurethane Ionomers with Tunable Hard/Soft Phase Segregation ». International Journal of Molecular Sciences 22, n^o 11 (7 juin 2021) : 6134. http://dx.doi.org/10.3390/ijms22116134.

Texte intégral

Résumé :

Segmented polyurethane ionomers find prominent applications in the biomedical field since they can combine the good mechanical and biostability properties of polyurethanes (PUs) with the strong hydrophilicity features of ionomers. In this work, PU ionomers were prepared from a carboxylated diol, poly(tetrahydrofuran) (soft phase) and a small library of diisocyanates (hard phase), either aliphatic or aromatic. The synthesized PUs were characterized to investigate the effect of ionic groups and the nature of diisocyanate upon the structure–property relationship. Results showed how the polymer hard/soft phase segregation was affected by both the concentration of ionic groups and the type of diisocyanate. Specifically, PUs obtained with aliphatic diisocyanates possessed a hard/soft phase segregation stronger than PUs with aromatic diisocyanates, as well as greater bulk and surface hydrophilicity. In contrast, a higher content of ionic groups per polymer repeat unit promoted phase mixing. The neutralization of polymer ionic groups with silver or zinc further increased the hard/soft phase segregation and provided polymers with antimicrobial properties. In particular, the Zinc/PU hybrid systems possessed activity only against the Gram-positive Staphylococcus epidermidis while Silver/PU systems were active also against the Gram-negative Pseudomonas aeruginosa. The herein-obtained polyurethanes could find promising applications as antimicrobial coatings for different kinds of surfaces including medical devices, fabric for wound dressings and other textiles.

Styles APA, Harvard, Vancouver, ISO, etc.

10

Kimura, Akihiro, Haruka Hayama, Jun-ya Hasegawa, Hassan Nageh, Yue Wang, Naofumi Naga, Mayumi Nishida et Tamaki Nakano. « Recyclable and efficient polyurethane-Ir catalysts for direct borylation of aromatic compounds ». Polymer Chemistry 8, n^o 47 (2017) : 7406–15. http://dx.doi.org/10.1039/c7py01509g.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Thèses sur le sujet "Aromatic polyurethanes"

1

Lind, Pernilla. « Biomarkers of aromatic isocyanates in exposed workers ». Lund : Dept. of Occupational and Environmental Medicine, Institute of Laboratory Medicine, Lund University, 1997. http://catalog.hathitrust.org/api/volumes/oclc/39725787.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

2

Pion, Florian. « L'acide férulique, un synthon naturel pour la préparation de nouveaux polymères aromatiques ». Electronic Thesis or Diss., Paris, AgroParisTech, 2014. http://www.theses.fr/2014AGPT0007.

Texte intégral

Résumé :

La lignine est le principal composant du bois après la cellulose, et en est séparée lors de la production de papier. Au sein de cette biomasse ligno-cellulosique, chez les graminés, l'acide férulique est l'agent qui ponte la lignine aux fibres polysaccharides afin de fortifier cet ensemble. Si la lignine est complexe et difficilement dégradable, cet acide férulique, puisqu'il est présent libre, est extractible de nombreuses ressources en milieu alcalin (pulpe de betterave, son de blé, de maïs, de riz…). De par sa nature aromatique, cet acide p-hydroxycinnamique se montre intéressant pour préparer de nouveaux polymères incorporant des noyaux aromatiques d'origine biosourcée. En effet, si les polymères biosourcés sont de plus en plus courants et diversifiés, aujourd'hui aucune solution effective n'est proposée pour l'incorporation de noyaux aromatiques biosourcés. Dans ce but, au sein de l'équipe APSYNTH, nous avons développé une nouvelle classe de bisphénols totalement biosourcés obtenus par voie enzymatique. Ces bisphénols ont ensuite été mis en jeu dans différentes stratégies pour préparer de nouveaux copolyesters, polyuréthanes et oligomères polyphénoliques. Ces travaux présentent la synthèse et la caractérisation de ces nouveaux bisphénols issus de l'acide férulique, ainsi que des différents polymères en résultant
Lignin is the most abundant component of wood after cellulose and is separated from whilepaper production. Within this lingo-cellulosic biomass, in case of graminous, ferulic acid is a crosslinkingagent binding lignin to polysaccharide fibers to increase its mechanical properties. If lignin iscomplex and poorly degradable, ferulic acid, as it is present free, is extractible in alkali media frommany resources (beetroot pulp, wheat, corn, rice...).By its aromatic nature, this p-hydroxycinnamic acid seems interesting to prepare new polymersincorporating biobased aromatic units. Indeed, if biobased polymers are more and more nowadays,today biobased aromatic units are still missing.In this aim, into the APSYNTH team, we developed a new class of biobased bisphenols obtainedthrough enzymatic catalysis. These bisphenols were then implicated in different strategies to developnew copolyesters, polyurethanes and polyphenolic oligomers. This work describes the synthesis andcharacterization of this new bisphenols derived from ferulic acid, as well as the resulting polymers

Styles APA, Harvard, Vancouver, ISO, etc.

3

Vitkauskienė, Irena. « Chemical recycling of industrial poly(ethylene terephthalate) waste : synthesis of aromatic polyester polyols, their properties and use ». Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110920_152312-50729.

Texte intégral

Résumé :

In this study, the generation points, reasons and properties of industrial PET waste were examined in detail. Different chemical recycling ways were suggested for each kind of industrial PET waste. Under glycolysis of industrial PET waste by ethylene glycol, the yield of the main product bis(2-hidroxyethylene) terephthalate was higher than 85 %. Several series of aromatic polyester polyols (APP) were synthesized by transesterification of industrial PET waste using diethyleneglycol (DEG) in the presence of functional additives glycerol (GL) or/and adipic acid (ADA). The effect of functional additives on transesterification process and viscosity of APP was thoroughly studied and mathematically described for the first time. APP synthesized by transesterification of industrial PET waste using DEG in the presence of ADA and/or GL fragments, had lower crystallinity and were much more stable during storage at room temperature. Viscosity of APP slightly depended on the catalyst type and its concentration. Polyurethane-polyisocyanurate (PU-PIR) foams were produced under the reaction of APP and an excess of diisocyanate. PU-PIR foams based on PET-waste-derived APP containing fragments of GL or/and ADA were characterized by excellent physical-mechanical properties, high thermal stability, low heat release and smoke production. The burning test confirmed that PU-PIR foams satisfied the requirements for class E of construction products and building elements.
Šiame darbe nuodugniai ištirtos gamybinių polietilentereftalato (PET) atliekų susidarymo vietos, priežastys bei jų savybės. Pasiūlyti skirtingi cheminio perdirbimo būdai ir sąlygos kiekvienai gamybinių PET atliekų rūšiai. Vykdant gamybinių PET atliekų glikolizę etilenglikoliu, pasiekta didesnė negu 85 % bis(2-hidroksietilen)tereftalatо išeiga. Peresterinant gamybines PET atliekas dietilenglikoliu (DEG) ir naudojant funkcinius priedus glicerolį (GL) ir/arba adipo rūgštį (ADR), susintetinta serija aromatinių poliesterpoliolių (APP), besiskiriančių savo klampa ir kitomis savybėmis. Pirmą kartą nuodugniai ištirta ir matematiškai aprašyta peresterinimo reakcijos mišinyje esančių funkcinių priedų įtaka APP klampai. APP, susintetinti peresterinant gamybines PET atliekas DEG ir turintys ADR ir/arba GL fragmentų, yra mažai linkę kristalintis ir stabilūs saugant juos kambario temperatūroje. APP klampa mažai priklauso nuo metaloorganinio katalizatoriaus cheminės sudėties ir jo koncentracijos. Naudojant PET peresterinimo metu gautus APP ir diizocianato perteklių, susintetintos poliuretano-poliizocianurato (PU-PIR) putos. Putos, gautos iš APP, kuriuose yra GL ir/arba ADR fragmentų, pasižymi geromis fizikomechaninėmis savybėmis ir dideliu terminiu stabilumu, joms degant išsiskiria mažesnis šilumos ir dūmų kiekis. Atliekant degumo bandymus nustatyta, kad PU-PIR putos atitinka reikalavimus, taikomus Е klasės statybinėms konstrukcijoms ir elementams.

Styles APA, Harvard, Vancouver, ISO, etc.

4

Bohlin, Pernilla. « Passive sampling of PAHs and some trace organic compounds in occupational and residential air : needs, evaluation and limits / ». Göteborg : Institute of Medicine at Sahlgrenska Academy, University of Gothenburg, 2010. http://hdl.handle.net/2077/2.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

5

Riddar, Jakob B. « Isocyanates, Amines and Alkanolamines : Sampling, Chromatography and Detection ». Doctoral thesis, Stockholms universitet, Institutionen för analytisk kemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-94067.

Texte intégral

Résumé :

Isocyanates, aromatic-, aliphatic- and alkanolamines are commonly used in the industry today. Millions of workers in Europe are exposed. The most frequent health symptoms are respiratory and dermal disorder. Due to the health risk most of the compounds in this thesis are regulated by authorities and have occupational exposure limits (OELs). Consequently, reliable and robust air sampling methods are urgently needed. In this thesis dry samplers for isocyanates, aliphatic- and alkanolamines have been developed and evaluated. The isocyanate sampler is now a commercial product (ASSET EZ4-NCP Dry Sampler, Supelco). The samplers were based on a denuder with a filter in series. The denuder and filter were impregnated with di-n-butylamine for the isocyanate sampler and with sulphuric acid for the aliphatic- and alkanolamine sampler. The robustness of the dry samplers was extensively evaluated. This was performed in a climate chamber containing a controlled atmosphere of the studied compounds. New methods based on hydrophilic interaction liquid chromatography (HILIC) coupled with tandem mass spectrometry (MSMS) were developed for determination of aromatic-, aliphatic- and alkanolamines in aqueous solutions. Isocyanates were determined by reversed-phase liquid chromatography MSMS. HILIC in combination with MS is a most powerful system, and highly sensitive determinations, several orders of magnitude below the OELs, of polar compounds present in the work environment can be accomplished. The selected samplers enable sampling during short sampling times and for whole work shifts. The samplers can be stored for months before and after sampling. The performance of the samplers was unaffected by variation in temperature, humidity, flow-rate and pre- and post-sampling of ambient air. Sampling for the compounds studied is now greatly simplified, and assessment of the work environment is facilitated.

At the time of the doctoral defence the following papers were unpublished and had a status as follows: Paper 1: Epub ahead of print; Papers 3-5: Manuscripts

Styles APA, Harvard, Vancouver, ISO, etc.

6

Dumont, Marie-José. « Polyurethanes plastic sheets and foams synthesized from aromatic triols ». 2010. http://hdl.handle.net/10048/867.

Texte intégral

Résumé :

Thesis (Ph. D.)--University of Alberta, 2010.
Title from pdf file main screen (viewed on Jan. 15, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Bioresource and Food Engineering, Department of Agricultural, Food and Nutritional Science, University of Alberta. Includes bibliographical references.

Styles APA, Harvard, Vancouver, ISO, etc.

7

Fan, Gau-Chang, et 范高彰. « Studies on the synthesis and properties of aromatic and semi- aromatic polyurethanes ». Thesis, 1993. http://ndltd.ncl.edu.tw/handle/08721065645901227941.

Texte intégral

Résumé :

碩士
中原大學
化學工程研究所
81
A series of polyurethanes and copolyurethanes was prepared by solution polymerization using various imide diols with hexamethylene diisocyanate(HMDI), 4,4'-diphenyl methane diiso- cyanate (MDI), 2,4- toluylene diisocyanate (2,4-TDI) and iso- phorone diisocyanate (IPDI), respectively. Thermal stability, solubility and liquid crystalline properties of these synthe- sized polyurethanes were examined. The influence of the length of flexible chain on the properties of these polymers was studied. The pyromellitic diimide unit could be played as the role of the mosegen for a liquid cryatalline polymer. However, the thermal stability of this liquid crystal polymer was not good. Therefore, longer rodlike mesogen was introduced, the obtained polymer possesed better liquid crystalline properties.

Styles APA, Harvard, Vancouver, ISO, etc.

8

Dumont, Marie-Jose. « Polyurethanes plastic sheets and foams synthesized from aromatic triols ». Phd thesis, 2009. http://hdl.handle.net/10048/867.

Texte intégral

Résumé :

Novel plastic sheets and foams from vegetable oil-based monomers were produced. These new polyurethanes were synthesized from aromatic polyols, with erucic acid as the starting material. These monomers have the unique feature of containing an aromatic ring which was hypothesized to improve the rigidity of the polyurethane matrices and the overall physical properties of the plastics and foams. The benefits of the aromatic ring were proposed to be enhanced due to three terminal primary hydroxyl groups within the structure of the polyols. Reactions to produce hexasubstituted benzene derivatives containing alcohol groups in positions 1,2,4- and 1,3,5- around the benzene ring were suitably scaled up to provide amounts necessary for polyurethane production and characterization. These isomers (asymmetric and symmetric triols) were separated using chromatography. The pure triols were crosslinked with 4,4-methylenebis(phenyl isocyanate) into polyurethanes sheets (asymmetric and symmetric polyurethane respectively). The physico-chemical properties of these PUs were studied by Fourier transform infrared spectroscopy, x-ray diffraction,, differential scanning calorimetry dynamic mechanical analysis, thermogravimetric analysis coupled with Fourier transform infrared spectroscopy, and tensile analysis. The asymmetric polyurethane sheet and the symmetric polyurethane sheet differed in their glass transition temperatures and crosslinking densities. This variation could be explained by the differences in crosslinking densities, related to the increase in steric hindrance between adjacent hydroxyl groups of the asymmetric triol monomers. It was found that both polyurethanes had similar mechanical and thermal properties. Due to the similar properties of the asymmetric polyurethane and symmetric polyurethane sheets, the monomers were combined together in order to synthesize PU foams. The physical properties of these foams were studied by Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical analysis, scanning electron microscopy, thermogravimetric analysis and were analyzed for close cell content and compression strength. The effect of the benzene ring in the monomer structure on the physical properties of these new polyurethane foams was mainly compared with high density canola polyurethane foams previously investigated. It was demonstrated that the physical properties of polyurethane foams made with aromatic monomers are comparable to those made with aliphatic monomers when enhanced with glycerol.
Bioresource and Food Engineering

Styles APA, Harvard, Vancouver, ISO, etc.

9

Pražanová, Kateřina. « Biodegradace lehčených polyuretanů v půdě a následná analýza produktů rozkladu ». Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-388356.

Texte intégral

Résumé :

According to the Waste Framework Directie 2008/98/ES and the Czech law on waste 185/2001 Sb., waste preienton is the main priority in waste management. Using biodegradable plastcs seems to represent a suitable approach in fulflling the strategy. The subject of this diploma thesis is biodegradable lightweight polyurethanes (PURs), which might represent suitable materials for repellent fences in agricultural landscapes. Biodegradaton processes are assumed to begin in the agricultural soil afer their lifetme. The biodegradability of new lightweight PURs (BIO 8-10), presented as material mineralizaton, was tested in agricultural soil under laboratory conditons according to the ASTM Internatonal standard method D5988-03. Afer the nine-month experiment the material with the highest biodegradability (BIO 10) containing starch (28 wt. %) was mineralized to 42.0 ± 4.2 %. Cellulose (the positie control) was completely mineralized; thus, the ialidity criterion (positie control mineralizaton > 70 %) was accomplished. Afer the biodegradability test, degradaton products (residual PURs) were separated from the soil by a two-step method using fuidisaton and fotaton, according to a modifed procedure described in Nuelle et al. (2014). The procedure enabled a subsequent analysis of PUR residues with Fourier transform...

Styles APA, Harvard, Vancouver, ISO, etc.

10

Hung, Yu-Chun, et 洪于淳. « Synthesis of Polyurethane-Aromatic Sulfone Copolymers and Properties ». Thesis, 2002. http://ndltd.ncl.edu.tw/handle/m4462u.

Texte intégral

Résumé :

碩士
逢甲大學
紡織工程所
90
Polyurethane (PU) has already found extensive application in many diversified field. One disadvantage of PU is their poor thermal properties in high tempertature. In order to improve the thermal properties of PU, we incorporated three kinds of chain extender contain Bis(4－Aminophenyl) Sulfone [Bisaminol S]、Bis(4－Hydroxyphenyl) Sulfone [Bisphenol S] and 3,3’,4,4’－Diphenylsulfonetetracarboxylic Dianhydride [DSDA] as chain extender separately. All of three different chain extenders have sulfone group and benzene structures, so as to improve their thermal stability. In this study, PTMG is the soft component. MDI and three different chain extenders are the hard component. There were shown different thermal stability among chain extender. There were made a series of polyurethane within different chain extenders by two steps. Both of traditional polyurethane and ameliorative polyurethane will do a series of tests and analyses. In our experiment, the formation of copolymer were synthesized successfully. There were not only proved by FTIR and H1 NMR spectroscopy.But also the intrinsic viscosity of ameliorative copolymers had rise obviously. For the thermal properties, the initial degradation temperature of ameliorative copolymers were higher than tradition polyurethane and it showed that the second degradation step increased as the hard segment content. Tgs and Tgh were all higher than traditional polyurethane. For the mechanical properties, the tenacity of ameliorative copolymers were all higher than traditional polyurethane.

Styles APA, Harvard, Vancouver, ISO, etc.

Livres sur le sujet "Aromatic polyurethanes"

1

Chuang, J. C. Comparison of polyurethane foam and XAD-2 resin as collection media for polynuclear aromatic hydrocarbons in air. Research Triangle Park, NC : U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory, 1987.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

2

Murla, Mark Allen. The thermally reversible nature of the aromatic urethane bond. 1991.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Chapitres de livres sur le sujet "Aromatic polyurethanes"

1

Hoyle, Charles E., Young G. No et Keziban S. Ezzell. « Flash Photolysis of Aromatic Diisocyanate-Based Polyurethanes ». Dans ACS Symposium Series, 43–56. Washington, DC : American Chemical Society, 1989. http://dx.doi.org/10.1021/bk-1989-0381.ch004.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

2

Aithal, U. Shanthamurthy, Tejraj M. Aminabhavi et Patrick E. Cassidy. « Sorption and Diffusion of Monocyclic Aromatic Compounds Through Polyurethane Membranes ». Dans ACS Symposium Series, 351–76. Washington, DC : American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0423.ch019.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

3

« 4. Rigid Polyols Based On The Alkoxylation Of Aromatic Compound Condensates With Aldehydes ». Dans [Set Polyols for Polyurethanes, Volume 1+2], 59–88. Berlin, Boston : De Gruyter, 2019. http://dx.doi.org/10.1515/9783110644128-004.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "Aromatic polyurethanes"

1

Croll, Stuart G., Graham E. C. Bell et Brent D. Keil. « Long-Term Weathering Effects on Aromatic Polyurethane-Coated Pipe ». Dans Pipelines 2014. Reston, VA : American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413692.182.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

2

Balan, Aparna K., M. P. Sreejith, V. Shaniba, T. V. Jinitha, N. Subair et E. Purushothaman. « Transport behavior of aromatic hydrocarbons through coconut shell powder filled thermoplastic polyurethane/natural rubber blend-composites ». Dans LET THERE BE LIGHT : Reflections of a Congress on Light. Author(s), 2017. http://dx.doi.org/10.1063/1.4984193.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

3

Croll, Stuart, Chunju Gu, Vinod Upadhyay et Brent Keil. « Aromatic Polyurethane Coating’s Long Term Corrosion Protection Capability after Two Years of Extended Above Ground Exposure ». Dans Pipelines 2019. Reston, VA : American Society of Civil Engineers, 2019. http://dx.doi.org/10.1061/9780784482506.049.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Rapports d'organisations sur le sujet "Aromatic polyurethanes"

1

Hoyle, Charles E., et Kyu-Jun Kim. Photolysis of Aromatic Diisocyanate Based Polyurethanes in Solution. Fort Belvoir, VA : Defense Technical Information Center, août 1986. http://dx.doi.org/10.21236/ada169644.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!