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Journal articles on the topic 'Polyurethanes Mechanical properties'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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1

Patel, Rasmika, Amin Hirani, and Hitesh Patel. "Flame Retardant Polyurethanes and their Applications for the Improvement in Properties of Conventional Castor Oil Based Polyurethane." Material Science Research India 11, no. 2 (2014): 159–67. http://dx.doi.org/10.13005/msri/110209.

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The urethane polymers of castor oil (COPU) are used in many commercial applications but one of the major limitations of these polymers is their inherent flammability and poor mechanical properties. Polymers containing phosphorous groups belong to the fire retardants, and when blended with castor oil based polyurethane improves the latter’s fire retardant properties. Present work, deals with the synthesis of a monomer bis (m-hydroxy phenyl) phenyl phosphate (BHPPP) and its related polyurethanes. Characterization of the monomer and polyurethanes are discussed. Blending of the polyurethanes with
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2

Ivakina, K., E. Skadins, A. Kiyanitsa, et al. "Influence of Nanoclay Additive on Mechanical Properties of Bio-Based Polyurethane Nanocomposites." Key Engineering Materials 559 (June 2013): 37–42. http://dx.doi.org/10.4028/www.scientific.net/kem.559.37.

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This paper is about investigation of the bio-based polyurethanes from the rapeseed oil polyols and their modification with montmorillonite nanoparticles. The results of hardness and tensile properties investigation of polyurethane / montmorillonite nanocomposites are presented.
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3

Jalili Marand, Maryam, Mostafa Rezaei, Amin Babaie, and Reza Lotfi. "Synthesis, characterization, crystallinity, mechanical properties, and shape memory behavior of polyurethane/hydroxyapatite nanocomposites." Journal of Intelligent Material Systems and Structures 31, no. 14 (2020): 1662–75. http://dx.doi.org/10.1177/1045389x20932212.

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Herein, polycaprolactone diols with diverse molecular weights were synthesized by ring-opening method. Then, polyurethanes were synthesized through two-step pre-polymerization method by polyaddition of hydroxyl and –NCO groups. Afterward, a set of polyurethanes/hydroxyapatite nanocomposites were synthesized through solution casting as well as in situ polycondensation methods. The exact nominal molecular weights of the synthesized polycaprolactones were determined by proton nuclear magnetic resonance (hydrogen-1 nuclear magnetic resonance). Hydrogen bonding index of ester and urethane carbonyl
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4

Arévalo, Fabián R., Sonia A. Osorio, Nathaly A. Valcárcel, Jeimmy C. Ibarra, and Manuel F. Valero. "Characterization and in vitro Biocompatibility of Binary Mixtures of Chitosan and Polyurethanes Synthesized from Chemically Modified Castor Oil, as Materials for Medical Use." Polymers from Renewable Resources 9, no. 1 (2018): 23–38. http://dx.doi.org/10.1177/204124791800900102.

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This study aimed to evaluate the effect of the incorporation of chitosan into polyurethane matrices synthesized from chemically modified castor (Ricinus communis) oil by transesterification with pentaerythritol. An additional aim of this study was to determine the degree of acceptance as a biomaterial (obtained from renewable sources), based on the analysis of its mechanical properties (stress/rupture strain), hydrophilic character (contact angle), morphology (SEM) and in vitro compatibility of polyurethanes when in contact with mouse fibroblast L929 cells. No significant changes in mechanical
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5

Gunatillake, Pathiraja A., Darren J. Martin, Gordon F. Meijs, Simon J. McCarthy, and Raju Adhikari. "Designing Biostable Polyurethane Elastomers for Biomedical Implants." Australian Journal of Chemistry 56, no. 6 (2003): 545. http://dx.doi.org/10.1071/ch02168.

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The chemical structure, synthesis, morphology, and properties of polyurethane elastomers are briefly discussed. The current understanding of the effect of chemical structure and the associated morphology on the stability of polyurethanes in the biological environments is reviewed. The degradation of conventional polyurethanes appears as surface or deep cracking, stiffening, and deterioration of mechanical properties, such as flex-fatigue resistance. Polyester and poly(tetramethylene oxide) based polyurethanes degrade by hydrolytic and oxidative degradation of ester and ether functional groups,
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Yan, Rui, Bixin Jin, Yunjun Luo, and Xiaoyu Li. "Optically healable polyurethanes with tunable mechanical properties." Polymer Chemistry 10, no. 18 (2019): 2247–55. http://dx.doi.org/10.1039/c9py00261h.

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7

Oprea, S., V. O. Potolinca, and C. D. Varganici. "Synthesis and properties of polyurethane urea with pyridine-2,6-dicarboxamide moieties in their structure." RSC Advances 6, no. 108 (2016): 106904–13. http://dx.doi.org/10.1039/c6ra23660j.

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The inclusion of 2,6-pyridinedicarboxamide into polyurethanes structure strongly influenced their morphology, surface and thermo-mechanical properties. The 2,6-pyridinedicarboxamide units adopt syn-syn conformations into polyurethane matrix.
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8

Xiaoxia, Jian, Hu Yiwen, and Zheng Qilong. "Effect of thermal processing temperature on the microphase separation and mechanical properties of BAMO/THF polyurethane." Journal of Polymer Engineering 37, no. 2 (2017): 169–76. http://dx.doi.org/10.1515/polyeng-2015-0509.

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Abstract This paper describes the influence of thermal processing temperature on the microphase separation, hydrogen bonding, phase transitions and mechanical properties of 3,3-bis(azidomethyl)oxetane (BAMO)/tetrahydrofuran (THF) polyurethane binder, which is used for propellant. Fourier transform infrared (FTIR) spectroscopy confirmed that the intended polyurethane was synthesized and was used to determine the state of the local hydrogen bonding in these polyurethanes. The results showed that the thermal processing clearly imparts significant changes to the H-bonded environment and this was c
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9

Zheng, Qin, Shuling Gong, Haiqing Dong, and Yuanyin Chen. "Calix[4]arenes Used as a New Type of Chain Extender in the Preparation of Polyurethanes." Australian Journal of Chemistry 60, no. 3 (2007): 167. http://dx.doi.org/10.1071/ch06387.

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A series of polyether– or polyester–polyurethanes based on tetrahydrofuran–propylene oxide copolyether diol (PTMG/PPG) or poly(ethylene terephthalate) diol (PET), toluene diisocyanate (TDI), and three kinds of chain extenders including two calix[4]arene derivatives and 3,3´-dichloro-4,4´-diaminodiphenylmethane (MOCA) were synthesized in toluene. The thermal stability and mechanical properties of solvent-type polyurethanes were investigated. Incorporation of calixarenes into polyurethane backbones improved the thermal properties of the polyurethane as a result of the residual phenol hydroxy gro
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10

Brzeska, Joanna, Agnieszka Tercjak, Wanda Sikorska, Marek Kowalczuk, and Maria Rutkowska. "Predicted Studies of Branched and Cross-Linked Polyurethanes Based on Polyhydroxybutyrate with Polycaprolactone Triol in Soft Segments." Polymers 12, no. 5 (2020): 1068. http://dx.doi.org/10.3390/polym12051068.

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The number of cross-links in the non-linear polyurethane structure is the basic factor affecting its properties. Selected properties of aliphatic polyurethanes with soft segments made of different amounts of polycaprolactonetriol, polycaprolactonediol and synthetic, telechelic poly([R,S]-3-hydroxybutyrate) were determined. On the basis of changes in polyurethane properties, the correlation between these properties and the construction of soft segments was found. The structure of polyurethanes, their morphology, hydrophilicity, thermal and mechanical properties were examined. These properties w
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11

Zagożdżon, Izabela, Paulina Parcheta, and Janusz Datta. "Novel Cast Polyurethanes Obtained by Using Reactive Phosphorus-Containing Polyol: Synthesis, Thermal Analysis and Combustion Behaviors." Materials 14, no. 11 (2021): 2699. http://dx.doi.org/10.3390/ma14112699.

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Phosphorus-containing polyol applications in polyurethane synthesis can prevent volatilization of flame retardants and their migration on the surface of a material. In this work, novel cast polyurethanes were prepared by a one-step method with the use of different amounts of phosphorus-containing polyol, 4,4′–diphenylmethane diisocyanate and 1,4-butanediol. The chemical structure, thermal, physicochemical and mechanical properties and flame resistance of the prepared materials were investigated. The results obtained for cast flame-retarded polyurethanes were compared with cast polyurethane syn
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12

Yakushin, Vladimir, Uldis Stirna, Irina Sevastyanova, Dzintra Vilsone, Viesturs Zeltins, and Mikelis Kirpluks. "Properties of Polyurethanes Based on Tall Oil Fatty Acids Ester with Different Types of Flame Retardants." Key Engineering Materials 559 (June 2013): 115–20. http://dx.doi.org/10.4028/www.scientific.net/kem.559.115.

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To decrease the combustibility of polyurethanes based on tall oil fatty acids ester, additives of five different halogen- and phosphorus-containing flame retardants were used. The efficiency of the flame retardants was evaluated from the change in the thermal, mechanical and combustibility characteristics of the obtained polyurethanes. It has been found that the phosphorus-containing flame retardant Levagard 4090 N decreases the combustibility of polyurethane to the greatest extent.
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13

Uscátegui, Yomaira, Luis Díaz, José Gómez-Tejedor, et al. "Candidate Polyurethanes Based on Castor Oil (Ricinus communis), with Polycaprolactone Diol and Chitosan Additions, for Use in Biomedical Applications." Molecules 24, no. 2 (2019): 237. http://dx.doi.org/10.3390/molecules24020237.

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Polyurethanes are widely used in the development of medical devices due to their biocompatibility, degradability, non-toxicity and chemical versatility. Polyurethanes were obtained from polyols derived from castor oil, and isophorone diisocyanate, with the incorporation of polycaprolactone-diol (15% w/w) and chitosan (3% w/w). The objective of this research was to evaluate the effect of the type of polyol and the incorporation of polycaprolactone-diol and chitosan on the mechanical and biological properties of the polyurethanes to identify the optimal ones for applications such as wound dressi
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14

Qian, Yuqing, Xiaowei An, Xiaofei Huang, Xiangqiang Pan, Jian Zhu, and Xiulin Zhu. "Recyclable Self-Healing Polyurethane Cross-Linked by Alkyl Diselenide with Enhanced Mechanical Properties." Polymers 11, no. 5 (2019): 773. http://dx.doi.org/10.3390/polym11050773.

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Dynamic structures containing polymers can behave as thermosets at room temperature while maintaining good mechanical properties, showing good reprocessability, repairability, and recyclability. In this work, alkyl diselenide is effectively used as a dynamic cross-linker for the design of self-healing poly(urea–urethane) elastomers, which show quantitative healing efficiency at room temperature, without the need for any catalysts or external interventions. Due to the combined action of the urea bond and amide bond, the material has better mechanical properties. We also compared the self-healin
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15

Kiebala, Derek J., Zhiyuan Fan, Celine Calvino, Lauren Fehlmann, Stephen Schrettl, and Christoph Weder. "Mechanoresponsive Elastomers Made with Excimer-Forming Telechelics." Organic Materials 02, no. 04 (2020): 313–22. http://dx.doi.org/10.1055/s-0040-1721052.

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Mechanoresponsive luminescent (MRL) elastomers, which change their fluorescence color or intensity upon deformation, can facilitate simple strain detection through optical signals. Several polymers have been endowed with MRL properties by blending them with excimer-forming dyes, whose assembly and emission color are affected by deformation of the blended materials. However, access to elastic MRL polyurethanes based on this approach has proven difficult and usually requires the covalent incorporation of such dyes in high concentration. Here, we show that much simpler access to MRL elastomers is
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16

Nakamura, Kunio, Roland Mörck, Anders Reimann, Knut P. Kringstad, and Hyoe Hatakeyama. "Mechanical properties of solvolysis lignin-derived polyurethanes." Polymers for Advanced Technologies 2, no. 1 (1991): 41–47. http://dx.doi.org/10.1002/pat.1991.220020106.

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17

Yoo, Hye Jin, and Han Do Kim. "Preparation and Properties of Crosslinked Polyurethane Containing Hydrophilic PEO Component for Biomaterials." Key Engineering Materials 277-279 (January 2005): 82–89. http://dx.doi.org/10.4028/www.scientific.net/kem.277-279.82.

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A series of multiblock polyurethanes containing various poly(ethylene oxide) (PEO) contents (0-80 wt%) were prepared from hexamethylene diisocyanate (HDI)/ PEO / poly(tetramethylene oxide) (PTMO)/ polybutadiene diol (PBD)/ 1,4-butanediol (BD) and used as modifying additives (30 wt%) to improve the properties of biomedical grade PelletheneÒ. A hydrophilic PEO component was introduced by the addition of PEO-containing polyurethanes and dicumyl peroxide (DCP) as the crosslinking agents in a PelletheneÒ matrix. As the PEO content (PEO block length) increased, the hydrogen-bonding fraction of the c
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18

Strankowska, Justyna, Michał Strankowski, Łukasz Piszczyk, Józef Haponiuk, and Jerzy Kwela. "Mechanical, Structural and Diffusion Studies of Hydrogel Polyurethane Nanocomposites Containing Modified Montmorillonite." Materials Science Forum 714 (March 2012): 123–29. http://dx.doi.org/10.4028/www.scientific.net/msf.714.123.

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Polyurethane hydrogels nanocomposites belong to a new class of hybrid biomaterials with unique swelling properties in comparison to unmodified hydrogels. These materials combine the typical properties of gels (elasticity and permeability) with the reinforcing properties of clay nanoparticles. Therefore, nanohydrogels might be applied in pharmacy for the controlled release and delivery of drugs and other biologically active agents, as well as in cosmetology as strong absorbents. We synthesized nanohydrogel polyurethanes with Cloisite®30B organically modified clay nanoparticles of montmorillonit
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19

Li, Ying, Sichong Chen, Jun Shen, et al. "Preparation and Properties of Biobased, Cationic, Waterborne Polyurethanes Dispersions from Castor Oil and Poly (Caprolactone) Diol." Applied Sciences 11, no. 11 (2021): 4784. http://dx.doi.org/10.3390/app11114784.

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Biobased cationic waterborne polyurethanes (WPUs) were prepared using isophorone diisocyanate (IPDI), N-methyl diethanolamine (N-MDEA), polycaprolactone (PCL) diol, hydrochlotic acid (HCl), and 1,4-butanediol (BDO). To improve the mechanical performance and adhesive strength of the waterborne polyurethane films, different amounts of castor oil (CO) acting as a cross-linking agent were incorporated in the polyurethane structure. The structures of the waterborne polyurethanes were assessed by Fourier-transform infrared spectroscopy (FTIR). The combination of CO had a positive effect on the dispe
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20

Ahmad Zubir, Syazana, Ahmad Sahrim, and Ernie Suzana Ali. "Palm Oil Polyol/ Polyurethane Shape Memory Nanocomposites." Applied Mechanics and Materials 291-294 (February 2013): 2666–69. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2666.

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A series of nanoclay reinforced thermoplastic polyurethane with shape memory effect have been successfully synthesized via two-step polymerization process. The polyurethanes are composed of polycaprolactonediol, palm oil polyol, 4,4’-diphenylmethane diisocyanate and 1,4-butanediol. Nanoclay was added in order to improve the overall properties of the pristine polyurethane. Besides, the addition of palm oil polyol is believed to enhance the crosslinking process and further improve the properties. X-ray diffraction result showed that there is a decrease in crystallinity of polyurethane nanocompos
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21

Lin, Zhaojun, Qianqiong Zhao, Ruilan Fan, Xiaoxue Yuan, and Fuli Tian. "Flame retardancy and thermal properties of rigid polyurethane foam conjugated with a phosphorus–nitrogen halogen-free intumescent flame retardant." Journal of Fire Sciences 38, no. 3 (2020): 235–52. http://dx.doi.org/10.1177/0734904119890685.

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In this work, a halogen-free intumescent combining phosphorus and nitrogen, flame-retardant 2-((2-hydroxyphenyl)(phenylamino)methyl5,5-dimethyl-1,3,2-dioxaphosphinane 2-oxide (HAPO) was successfully synthesized. It had been synthesized by reaction of 5,5-dimethyl-1,3, 2-dioxphosphinane 2-oxide with Schiff base. Its chemical structure was characterized in detail by Fourier transform infrared spectroscopy, 1H NMR, and 31P NMR spectrum. The flame-retardant polyurethanes were prepared with different loadings of HAPO. The thermal properties, flame retardancy and combustion behavior of the pure poly
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22

Francolini, Iolanda, Ilaria Silvestro, Valerio Di Lisio, Andrea Martinelli, and Antonella Piozzi. "Synthesis, Characterization, and Bacterial Fouling-Resistance Properties of Polyethylene Glycol-Grafted Polyurethane Elastomers." International Journal of Molecular Sciences 20, no. 4 (2019): 1001. http://dx.doi.org/10.3390/ijms20041001.

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Despite advances in material sciences and clinical procedures for surgical hygiene, medical device implantation still exposes patients to the risk of developing local or systemic infections. The development of efficacious antimicrobial/antifouling materials may help with addressing such an issue. In this framework, polyethylene glycol (PEG)-grafted segmented polyurethanes were synthesized, physico-chemically characterized, and evaluated with respect to their bacterial fouling-resistance properties. PEG grafting significantly altered the polymer bulk and surface properties. Specifically, the PE
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23

Strankowski, Michał, Damian Włodarczyk, Łukasz Piszczyk, and Justyna Strankowska. "Thermal and Mechanical Properties of Microporous Polyurethanes Modified with Reduced Graphene Oxide." International Journal of Polymer Science 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/8070327.

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Microporous polyurethanes (MPU) were modified by adding 0.25%–1.25 wt% of reduced graphene oxide (RGO). The materials were prepared without solvent viain situpolymerization. From a technological point of view, it is very important to obtain functional materials by using reacting compounds only. The thermal characteristics of obtained MPU were investigated using TGA, DSC, and DMA techniques. In comparison to nonmodified microporous polyurethane, the thermal stability and mechanical properties of the modified systems have significantly improved. The temperature corresponding to the maximum degra
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24

WANG, Xuemei, Xiang GUI, Yingping QI, Yongfeng SHEN, and Hua LI. "Research Progress of Biodegradable Polyester Polyols Based on Ring-Opening Polymerization of Cyclohexene Carbonate." Materials Science 26, no. 3 (2020): 323–32. http://dx.doi.org/10.5755/j01.ms.26.3.21964.

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The polycarbonate polyols(PCD) obtained by ring-opening polymerization of a general cyclic monomer is mostly a linear flexible structure, which is used as a raw material to synthesize polyurethanes, and it is difficult to simultaneously ensure good thermal-mechanical properties and weather resistance due to insufficient rigidity of the main chain. However, PCD based on ring-opening polymerization of cyclohexene carbonate (CHC), endowing with polyurethanes good mechanical properties, weather ability and biological stability because of the rigid structure of six-membered aliphatic rings in the m
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25

Yeoh, Fang Hoong, Choy Sin Lee, Yew Beng Kang, Shew Fung Wong, Sit Foon Cheng, and Wei Seng Ng. "Production of Biodegradable Palm Oil-Based Polyurethane as Potential Biomaterial for Biomedical Applications." Polymers 12, no. 8 (2020): 1842. http://dx.doi.org/10.3390/polym12081842.

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Being biodegradable and biocompatible are crucial characteristics for biomaterial used for medical and biomedical applications. Vegetable oil-based polyols are known to contribute both the biodegradability and biocompatibility of polyurethanes; however, petrochemical-based polyols were often incorporated to improve the thermal and mechanical properties of polyurethane. In this work, palm oil-based polyester polyol (PPP) derived from epoxidized palm olein and glutaric acid was reacted with isophorone diisocyanate to produce an aliphatic polyurethane, without the incorporation of any commercial
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26

Lau, Ze Ren, Sau Leng Sin, Hong Yan, and Jian Wei Xu. "Adamantane-Modified Polyurethanes: Effect of Hydroxy Group of Adamantane on the Properties of Polyurethanes." Advanced Materials Research 1110 (June 2015): 92–95. http://dx.doi.org/10.4028/www.scientific.net/amr.1110.92.

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The paper describes synthesis and characterization of adamantane-modified polyurethanes (PU). The study shows that the number of hydroxy groups of adamantane additives plays a signifiant role in tuning polyurethane's properties. PU modified with adamantanetriol has relatively higher glass transition temperature than these with adamantanediol as an additive. Dynamic mechanical analysis (DMA) of PU with 0.5% adamantanetriol shows significant improvement in storage modulus and larger hardness than pure PU at low temperatures. In contrast, adamantanediol-modified PU exhibits lower storage modulus
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27

Ali, Alaa, Kamal Yusoh, and S. F. Hasany. "Synthesis and Physicochemical Behaviour of Polyurethane-Multiwalled Carbon Nanotubes Nanocomposites Based on Renewable Castor Oil Polyols." Journal of Nanomaterials 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/564384.

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Polyurethanes (PUs) are high performance materials, with vast industrial and engineering applications. In this research, effects of Multiwalled Carbon Nanotubes (MWCNTs) on physicochemical properties of Castor Oil based Polyurethanes (COPUs) were studied. MWCNTs were added in different weight percentages (0% to 1% wt) in a castor oil based polyurethane (COPUs-MWCNTs) nanocomposites. The composition, structure, and morphology of polyurethanes were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), field emission scanning
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28

Lin, Ling, Haiyan Mao, Ziyin Li, Wenyao Li, and Chaoxia Wang. "Preparation and Characterization of Optically Active Polyurethane from Rotatory Binaphthol Monomer and Polyurethane Prepolymer." Molecules 26, no. 10 (2021): 2986. http://dx.doi.org/10.3390/molecules26102986.

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Optically active polymers are promising multifunctional materials with great application potentials. Herein, environmentally friendly optically active polyurethanes (OPUs) were obtained by introducing rotatory binaphthol monomer to polyurethane. The influence of binaphthol monomer content on the structure, mechanical properties, infrared emissivity, and thermal insulation of OPUs was studied intensively. Structure characterization indicated that the optically active polyurethanes have been successfully synthesized. The OPU synthesized with BIMOL and BDO at the mole ratio of 1:1 presented bette
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29

Mrówka, M., M. Szymiczek, and J. Lenża. "Thermoplastic polyurethanes for mining application processing by 3D printing." Journal of Achievements in Materials and Manufacturing Engineering 1, no. 95 (2019): 13–19. http://dx.doi.org/10.5604/01.3001.0013.7620.

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Purpose: Thermoplastic polyurethanes (TPU) found application in mining. Due to the excellent processing properties, thermoplastic polyurethanes can be also use to make elements that would facilitate miner's work. These elements, however, differ in dimensions depending on the person who is going to use them, that is why they should be personalized. In case of all the above studies, the elements or stuffs were made by means of the injection method. This method limits the possibility of producing mining’s stuff only to models that have a mould. The 3D printing technology developing rapidly throug
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30

Pergal, Marija, Jasna Dzunuzovic, Milena Spírková, et al. "Study on the morphology and thermomechanical properties of poly(urethane-siloxane) networks based on hyperbranched polyester." Chemical Industry 67, no. 6 (2013): 871–79. http://dx.doi.org/10.2298/hemind130225022p.

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Two series of polyurethane films based on hyperbranched polyester of the second pseudogeneration (Boltorn?), 4,4'-methylenediphenyl diisocyanate and two different siloxane prepolymers, ?,?-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and ?,?-dihydroxypropyl-poly(dimethylsiloxane) (HP-PDMS), were prepared by two-step polymerization in solution. The influence of the type and content of soft segment on the morphology, thermomechanical and surface properties of the synthesized polyurethanes was studied by atomic force microscopy (AFM), small-angle X-ray scattering
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31

Ryszkowska, Joanna, Ewelina Zawadzak, Piotr Zapart, Witold Łojkowski, A. Opalińska, and Krzysztof Jan Kurzydlowski. "The Influence of ZrO2 Containing 10% Eu 3+ on the Polyurethane Hard Domain Structure in Nanocomposites with Luminescence Properties." Solid State Phenomena 128 (October 2007): 151–56. http://dx.doi.org/10.4028/www.scientific.net/ssp.128.151.

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This paper presents the results of studies on ZrO2 containing 10% Eu3+ as a nanofiller in polyurethane nanocomposites with luminescent properties. The nanocomposites, which are potential materials for electro-optical-electronic applications, were prepared by in-situ polymerization. Emission spectra, thermodegradation, thermal analysis and mechanical properties of polyurethane ZrO2/10% Eu3+ were investigated and the structure examined using HRSEM. The aim was to investigate the influence of the distribution of nanofillers in the composite and the structure of hard domains of polyurethanes on th
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Zhu, Chun Liu, Can Tao, Jun Jie Bao, Yi Ping Huang, and Ge Wen Xu. "Waterborne Polyurethane Used as Binders for Lithium-Ion Battery with Improved Electrochemical Properties." Advanced Materials Research 1090 (February 2015): 199–204. http://dx.doi.org/10.4028/www.scientific.net/amr.1090.199.

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LiFePO4based Lithium-ion batteries are prepared by nonionic waterborne polyurethane with different soft segments which act as binder. FTIR is used to characterize the structure of waterborne polyurethanes .The emulsion viscosity, mechanical properties of films are measured. The result shows that, the emulsion viscosity and tensile strength of polyurethane based polyether glycol are smaller than polyurethane based polyester. Charge-discharge, cycle performance and AC impedance spectroscopy measurement indicat that the first charge-discharge efficiency is 92%, the biggest discharge capacity is 1
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Li, Xiang Xu, Kyung Ho Jin, and Ur Ryong Cho. "Study on Mechanical Properties and Viscoelastic Properties of Bio-polyurethanes." Polymer Korea 43, no. 5 (2019): 674–79. http://dx.doi.org/10.7317/pk.2019.43.5.674.

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34

Komez, Aylin, Senem Buyuksungur, Vasif Hasirci, and Nesrin Hasirci. "Effect of chemical structure on properties of polyurethanes: Temperature responsiveness and biocompatibility." Journal of Bioactive and Compatible Polymers 33, no. 5 (2018): 479–97. http://dx.doi.org/10.1177/0883911518783233.

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Polyurethanes are known as one of the most biocompatible and inherently blood-compatible materials and have a wide range of applications in the medical field due to their controllable structure and properties. Durability, elasticity, elastomeric structure, fatigue resistance, versatility, and easy acceptance by the biological media after the application makes these polymers preferable in medical area. In this study, polyurethane films were prepared using poly(propylene-ethylene glycol) and either toluene-2,4-diisocyanate or 4,4′-methylenediphenyl diisocyanate without adding any other ingredien
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35

Bjelovic, Zoran, Ivan Ristic, Jaroslava Budinski-Simendic, et al. "The investigation reaction kinetic for polyurethanes based on different types of diisocyanate and castor oil." Chemical Industry 66, no. 6 (2012): 841–51. http://dx.doi.org/10.2298/hemind111216014b.

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The formation of polyurethanes based on vegetable oils is very complex and thus for industrial production of this materials it is important to determine the optimal temperature for polymerisation and finally to obtain materials with the proper mechanical properties. The goal of this work was to assess the kinetic of catalysed and noncatalysed reactions for polyurethanes based on castor oil as the polyol component and different types of diisocyanates. Due to the presences of hydroxyl groups on ricinoleic acid, castor oil is suitable for polyurethane preparation. The differential scanning calori
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Travinskaya, T. V., A. N. Brykova, Yu V. Savelyev, N. V. Babkina, and V. I. Shtompel. "(Bio)degradable Ionomeric Polyurethanes Based on Xanthan: Synthesis, Properties, and Structure." International Journal of Polymer Science 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/8632072.

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New (bio)degradable environmentally friendly film-forming ionomeric polyurethanes (IPU) based on renewable biotechnological polysaccharide xanthan (Xa) have been obtained. The influence of the component composition on the colloidal-chemical and physic-mechanical properties of IPU/Xa and based films, as well as the change of their properties under the influence of environmental factors, have been studied. The results of IR-, PMS-, DMA-, and X-ray scattering study indicate that incorporation of Xa into the polyurethane chain initiates the formation of a new polymer structure different from the s
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Chalid, Mochamad, Hans J. Heeres та Antonius A. Broekhuis. "A Study on the Structure of Novel Polyurethanes Derived from γ-Valerolactone-Based Diol Precursors". Advanced Materials Research 789 (вересень 2013): 274–78. http://dx.doi.org/10.4028/www.scientific.net/amr.789.274.

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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 con
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Briz-López, Eva Marina, Rodrigo Navarro, Héctor Martínez-Hernández, Lucía Téllez-Jurado, and Ángel Marcos-Fernández. "Design and Synthesis of Bio-Inspired Polyurethane Films with High Performance." Polymers 12, no. 11 (2020): 2727. http://dx.doi.org/10.3390/polym12112727.

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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 t
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Lv, Li Hua, Min Zuo, Chun Yan Wei, Xiao Wang, and Ke Wang. "Fabrication and Mechanical Properties Analysis of Flame-Retardant Fiberboards Made of Abandoned Flax Fibers and Polyurethanes." Advanced Materials Research 627 (December 2012): 892–95. http://dx.doi.org/10.4028/www.scientific.net/amr.627.892.

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In this paper, abandoned flax fibers were adopted as reinforcing materials, polyurethane particles were adopted as matrix materials. Through blend mastication and hot-pressing methods to exploit flame-retardant fiberboards, which were made of abandoned flax fibers and polyurethanes. This paper explored the mechanical properties and flame-retardant property.Tensile strength, bending strength and impact strength were selected as mechanical properties' test index, limiting oxygen index was selected as flame-retardant property's test index. Abandoned flax fibers mass fraction, hot-pressing tempera
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Oprea, Stefan, Petronela Gradinariu, and Veronica Oprea. "Properties and fungal biodegradation of the different cellulose derivatives structure included into castor oil-based polyurethane composites." Journal of Composite Materials 53, no. 25 (2019): 3535–48. http://dx.doi.org/10.1177/0021998319843334.

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The requirement to protect the environment involves the synthesis of new polymers, blends, and composites with a high content of biodegradable components. This work studies the synthesis and biodegradation of castor oil-based polyurethanes filled with different cellulose derivatives (hydroxyethyl cellulose and hydroxypropyl cellulose). The polyurethane composites present a slight decrease in tensile strength and thermal stability with the increase in cellulose derivatives content. Scanning electron microscopy results showed a good dispersion of the cellulose derivatives within the polyurethane
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Chen, Caihong, Zhening Yang, Fengxian Qiu, et al. "Novel three chiral azobenzene polyurethanes: Preparation, optical properties and simulation comparisons of two different polymeric thermo-optic switches." Journal of Nonlinear Optical Physics & Materials 24, no. 03 (2015): 1550028. http://dx.doi.org/10.1142/s0218863515500289.

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Three different structures of chiral side-chain azobenzene polyurethane (CAPU-1), chiral graft azobenzene polyurethane (CAPU-2) and chiral bisazo polyurethane (CAPU-3) were prepared by diazo coupling reaction. The structures, thermal, mechanical properties, refractive index (n) and transmission loss of CAPU-1~3 were investigated. The Y-branch and Mach–Zehnder polymeric thermo-optic switches were simulated based on the synthesized three chiral azo polyurethanes as waveguide materials. The response time differences are owing to the different substituents and structure of the azo compound. The co
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Alobad, Z. K., M. Albozahid, H. Z. Naji, H. S. Alraheem, and A. Saiani. "Influence of hard segments content on thermal, morphological and mechanical properties of homo and co-polyurethanes: a comparative study." Archives of Materials Science and Engineering 1, no. 109 (2021): 5–16. http://dx.doi.org/10.5604/01.3001.0015.0510.

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Purpose: This work aims to study the effect of hard segments (HS) content on the thermal, morphological and mechanical properties of polyurethane polymers based on 1.5 pentanediol chain extenders. Design/methodology/approach: Two comparable series of polyurethanes were synthesised including homo-polyurethane (Homo-PU) and copolyurethane (Co-PU). The Homo-PU consists of 100% wt. of hard segments (HS). The Co-PU composes of 30%wt. of soft segments (SS) using a poly(ethylene glycol)-block-poly(propylene glycol)-blockpoly( ethylene glycol) material. The effect of hard segments content on the morph
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Stachak, Piotr, Izabela Łukaszewska, Edyta Hebda, and Krzysztof Pielichowski. "Recent Advances in Fabrication of Non-Isocyanate Polyurethane-Based Composite Materials." Materials 14, no. 13 (2021): 3497. http://dx.doi.org/10.3390/ma14133497.

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Polyurethanes (PUs) are a significant group of polymeric materials that, due to their outstanding mechanical, chemical, and physical properties, are used in a wide range of applications. Conventionally, PUs are obtained in polyaddition reactions between diisocyanates and polyols. Due to the toxicity of isocyanate raw materials and their synthesis method utilizing phosgene, new cleaner synthetic routes for polyurethanes without using isocyanates have attracted increasing attention in recent years. Among different attempts to replace the conventional process, polyaddition of cyclic carbonates (C
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Faturechi, Rahim, Ata Hashemi, Nabiollah Abolfathi, Atefeh Solouk, and Alexander Seifalian. "Fabrications of small diameter compliance bypass conduit using electrospinning of clinical grade polyurethane." Vascular 27, no. 6 (2019): 636–47. http://dx.doi.org/10.1177/1708538119850994.

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Objective Compliance and viscoelastic mismatches of small diameter vascular conduits and host arteries have been the cause of conduit’s failure. Methods To reduce these mismatches, the aim of this study was to develop and characterize a polyurethane conduit, which mimics the viscoelastic behaviors of human arteries. Electrospinning technique was used to fabricate tubular polyurethane conduits with similar properties of the human common carotid artery. This was achieved by manipulating the fiber diameter by altering the syringe flow rate of the solution. The mechanical and viscoelastic properti
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Ilavský, Michal, Jaromír Fähnrich, Tadeusz Pakula, and Christopher Lantman. "Effect of Molecular Weight on Mechanical Behaviour of Segmented Polyurethanes." Collection of Czechoslovak Chemical Communications 60, no. 11 (1995): 1925–34. http://dx.doi.org/10.1135/cccc19951925.

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The effect of molecular weight of polyurethanes on their dynamic mechanical and ultimate behaviour was investigated in wide frequency and temperature ranges. The polyurethanes were prepared from α,ω-dihydroxy-poly(oxypropylene), 1,4-butanediol, 1-butanol and 4,4'-dicyclohexylmethane diisocyanate at constant stoichiometric molar ratio of OH and NCO groups. Molecular weight (MW) of the copolymers was varied by replacing partly the butanediol by equivalent amounts of butanol; the calculated values of MW ranged from 6 000 to infinity. In all samples the constant soft-segment concentrations (~50 wt
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Chalid, Mochamad, Masrudin, and Jaka Haris Mustafa. "Study of Nano-Fe3O4 Addition on Magnetic and Mechanical Properties of HMDI-Based Polyurethane." Materials Science Forum 894 (March 2017): 25–28. http://dx.doi.org/10.4028/www.scientific.net/msf.894.25.

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Polyurethane has a wide range of chemical structures available led to the design of materials that easily can meet requirements to shape memory polyurethane (SMPU) due to its ability to retain its shape after deformation through giving a certain disturbance like magnetic field. Based on the previous study, polyurethanes synthesized by reacting 4,4’-methylenebis (cyclohexyl isocyanate) to poly(ethylene glycol) Mw: 6000 as polyurethane chain with 1,1,1-trimethylol propane as chain extender, is a potential candidate for shape memory polyurethane (SMPU). Furthermore this study was performed by add
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Gouveia, Júlia Rocha, Cleber Lucius da Costa, Lara Basílio Tavares, and Demetrio Jackson dos Santos. "Synthesis of Lignin-Based Polyurethanes: A Mini-Review." Mini-Reviews in Organic Chemistry 16, no. 4 (2019): 345–52. http://dx.doi.org/10.2174/1570193x15666180514125817.

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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. De
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Fedderly, Jeffry J., Gilbert F. Lee, and John D. Lee. "Effect of crosslinking on dynamic mechanical properties of polyurethanes." Journal of the Acoustical Society of America 105, no. 2 (1999): 1382. http://dx.doi.org/10.1121/1.426534.

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Issam, A. M., and Sufia Hena. "New T-Shape Polyurethanes: Synthesis, Thermal and Mechanical Properties." Polymer-Plastics Technology and Engineering 51, no. 4 (2012): 391–95. http://dx.doi.org/10.1080/03602559.2011.639332.

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Luchkina, L. V., A. A. Askadskii, K. A. Bychko, O. V. Afonicheva, and O. V. Kovriga. "Mechanical Properties of Materials Based on Polyisocyanurates and Polyurethanes." International Polymer Science and Technology 34, no. 2 (2007): 27–30. http://dx.doi.org/10.1177/0307174x0703400205.

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