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cjps.org

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.

chemeng.uwaterloo.ca

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pub.chinasciencejournal.com

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chemicalbook.com

Chemicalbook is a platform dedicated to provide the most valuable resources for chemical industry users. Here you can get chemical information (such as chemical physical properties, safety data, Excellent china suppliers and their web addresses and etc.)by searching the name, CAS number, molecular formula, molecular weight, MDL number, EINECS number, structure.

pubs.rsc.org

The power conversion efficiency of proton exchange membrane fuel cells (PEMFCs) is directly determined by proton-conduction-attributed current across conventional perfluorosulfonic acid (PFSA) membranes. Incorporation of fillers is frequently proposed to increase the in-membrane active sites and proton condu

aladdin-e.com

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che.ntut.edu.tw

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library.sut.ac.th

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