Synthesis, characterization and infrared emissivity property of optically active polyurethane derived from tyrosine
作者： Yong Yang , Yuming Zhou , Jianhua Ge , Yongjuan Wang , Xinglan Chen
DOI: 10.1016/J.POLYMER.2011.06.027
关键词:
摘要: Abstract Optically active polyurethanes (LPU and DPU) racemic polyurethane (RPU) were synthesized by the self-polyaddition of isocyanate-phenols which derived from chiral tyrosine. All polymers characterized FT-IR, 1 H NMR, GPC, UV–Vis spectroscopy, circular dichroism (CD) TGA X-ray diffraction (XRD), infrared emissivity values investigated in addition. LPU DPU two enantimorphs, they possessed helical configurations higher degree hydrogen bondings compared to RPU presented random coiled molecular chain. The crystallinity thermal decomposition temperature than that due more regular secondary structure facilitate formation a large number inter-chain bonds. Consequently, exhibited lower (8–14 μm), came down 0.611 0.625.
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