Chain Extender-induced Hydrogen Bonding Organization Determines the Morphology and Properties of Thermoplastic Polycarbonate Polyurethane  

作　　者：Yi-Lang Qin Ping Zhu Chen-Xi Ouyang Xia Dong 

机构地区：[1]Fuwai Hospital,Chinese Academyof Medical Sciences&Peking Union Medical College/National Center for Cardiovascular Diseases,Bejing 100037,China [2]CASKey Laboratoryof Engineering Plastics,CAS Research/Education Centerfor Excellence in Molecular Sciences,Institute ofChemistry,Chinese Academy of Sciences,Beijing 100190,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Journal of Polymer Science》2024年第1期87-96,I0009,共11页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.21774135)。

摘　　要：Thermoplastic polycarbonate polyurethanes(PCUs) are multiblock copolymers that have been applied for medical devices for long time. Aliphatic diols are common chain extenders(CE) involved in the composition of the hard segments of PCU. However, limited knowledge was discovered about how the chemical structure of CE affects the hydrogen bonding organization within PCUs and their mechanical properties.To investigate this problem, a group of PCUs were synthesized respectively by extending the polymer chain with 1,4-butanediol(BDO),aminoethanol(MEA), ethanediol(EO) as three kinds of chain extenders. Tiny differences in the CE chemical structure results in remarkable variations in phase separation, condensed morphologies, thermal and mechanical properties, which are characterized by Fourier transform infrared spectrometer, atomic force microscopy, small-angle X-ray scattering, differential scanning calorimetry, and tensile tests. The microstructural evolution during unilateral deformation and the different mechanism induced by the different CEs was probed and unveil by in situ wide-and small-angle X-ray diffraction. Symmetry of CE can improve the organization of the hydrogen bonding. The coherence strength of the urethane/urea group also plays a key role by comparing the two PCUs with ethanediol and aminoethanol.

关 键 词：Thermoplastic polycarbonate polyurethane Chain extender Hydrogen bonding Mechanical properties 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]