Effect of isocyanates on the crystallinity and thermal stability of polyurethanes

Song, Yan; Chen, W. C.; Yu, T. Leon; Linliu, Kung; Tseng, Y. H.

doi:10.1002/(sici)1097-4628(19961031)62:5<827::aid-app15>3.3.co;2-m

Cited by 8 publications

(9 citation statements)

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“…All polymers were stable up to more than 180°C (T d 5%), an interesting feature for polyurethanes systems (113). These unexpected but relatively good thermal stability of our phenolic polyurethanes is probably due to the presence of the methoxy group on the aromatic rings, vicinal to the phenols involved in the urethane bonds, that probably stabilizes the system thereby preventing thermal decomposition.…”

Section: Thermal Characterizationmentioning

confidence: 99%

Chemo-enzymatic Synthesis, Derivatizations, and Polymerizations of Renewable Phenolic Monomers Derived from Ferulic Acid and Biobased Polyols: An Access to Sustainable Copolyesters, Poly(ester-urethane)s, and Poly(ester-alkenamer)s

Pion

Armando

Mouandhoime

et al. 2015

ACS Symposium Series

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Section: Thermal Characterizationmentioning

confidence: 99%

Chemo-enzymatic Synthesis, Derivatizations, and Polymerizations of Renewable Phenolic Monomers Derived from Ferulic Acid and Biobased Polyols: An Access to Sustainable Copolyesters, Poly(ester-urethane)s, and Poly(ester-alkenamer)s

Pion

Armando

Mouandhoime

et al. 2015

ACS Symposium Series

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“…If the main chain had aromatic, the hardness and thermal stability of polyurethane were increased. When the first-class alcohol and isocyanate synthesized polyurethane, if the main chain introduced trivalent nitrogen atoms, and the third price of nitrogen atoms was alkyl, then polymers had higher flexibility [6][7][8][9] . This article showed that polyurethane was smeared the surface and the inner of guide wire in the ultra-slippery used for medical diagnosis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of polyurethane

Liu

Hao-xiong

et al. 2010

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Polyurethane was synthesized by the copolymerization with isocyanate and diols. The structure and properties of the copolymers were characterized by infrared spectrometer (IR), differential scanning calorimetry (DSC) and thermogravimetry (TG). The rabbit blood samples was dripped on the polyurethane, which was prepared by drying and die, and the contact angle was measured by contact angle measurement, then infiltration phenomenon was observed by electron microscopy .The results showed that the contact angle of blood samples and polyurethane was decreased with increasing time, and the platelets on the polyurethane would gradually increase and more rules. Thus the polyurethane coating had good hydrophilic property and anticoagulant activity.

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“…Previous studies [17,27,28] have shown that the nature of the macroglycol and the isocyanate, and the hard to soft segment ratio determine the properties of TPUs. Figure 4 shows the variation of the T g values (obtained in the low-temperature region of the DSC curves) as a function of the hard segment content in the TPUs.…”

Section: Properties Of Tpusmentioning

confidence: 99%

Structure, composition, and adhesion properties of thermoplastic polyurethane adhesives

Sánchez-Adsuar¹,

Martı́n-Martı́nez²

2000

Journal of Adhesion Science and Technology

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The composition and hard segment content of 13 commercial thermoplastic polyurethane elastomers (TPUs) were obtained using 1 H-nuclear magnetic resonance ( 1 H-NMR). The properties of the TPUs were studied using differentialscanning calorimetry(DSC), wide-angle X-ray diffraction (WAXD), dynamic mechanical thermal analysis (DMTA), and contact angle measurements. Solventbased adhesives were prepared by dissolving the TPUs in 2-butanone. Films of the TPUs were obtained by solvent evaporation, and their properties were studied. Adhesion properties were determined from T-peel tests on solvent-wiped poly(vinyl chloride) (PVC)/ polyurethane adhesive joints. The in uence of the segmented structure on the properties of the TPUs was assessed. The increase in the hard segment content in TPUs favoured the incompatibility (i.e. reduced phase separation) between hard and soft domains. TPUs with a high hard segment content had a low crystallinity, a low wettability, and a high joint strength. The storage and loss moduli obtained using DMTA decreased as the hard segment content in the TPUs increased. Furthermore, the TPUs prepared using "-polycaprolactone as the macroglycol had a slower crystallization rate than those prepared using the polyadipate of 1,4-butanediol or the polyadipate of 1,6-hexanediol. The increase in the length of the hydrocarbon chain of the macroglycol improved both the rheological and the thermal properties of the TPUs. Finally, TPUs prepared using MDI as the isocyanate showed a higher crystallinity and a higher degree of crosslinking than those prepared using TDI.

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Effect of isocyanates on the crystallinity and thermal stability of polyurethanes

Cited by 8 publications

References 0 publications

Chemo-enzymatic Synthesis, Derivatizations, and Polymerizations of Renewable Phenolic Monomers Derived from Ferulic Acid and Biobased Polyols: An Access to Sustainable Copolyesters, Poly(ester-urethane)s, and Poly(ester-alkenamer)s

Chemo-enzymatic Synthesis, Derivatizations, and Polymerizations of Renewable Phenolic Monomers Derived from Ferulic Acid and Biobased Polyols: An Access to Sustainable Copolyesters, Poly(ester-urethane)s, and Poly(ester-alkenamer)s

Synthesis and characterization of polyurethane

Structure, composition, and adhesion properties of thermoplastic polyurethane adhesives

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