Ghosh Tuhin, Karak Niranjan
Advanced Polymer and Nanomaterial Laboratory, Center for Polymer Science and Technology, Department of Chemical Sciences, Tezpur University, Tezpur 784028, India.
ACS Omega. 2018 Jun 30;3(6):6849-6859. doi: 10.1021/acsomega.8b00734. Epub 2018 Jun 25.
Silicone-containing biobased hyperbranched polyurethane thermoplastic elastomers at different compositions were reported for the first time. The structures of the polymers were evaluated from Fourier transform infrared spectroscopy, NMR, X-ray diffraction, and energy-dispersive X-ray spectroscopy analyses. The synthesized elastomers possess high molecular weight (1.11-1.38 × 10 g·mol) and low glass transition temperature (from -40.0 to -27.3 °C). These polymers exhibited multistimuli responsive excellent repeatable intrinsic self-healing (100% efficiency), shape recovery (100%), and efficient self-cleaning (contact angle 102°-107°) abilities along with exceptional elongation at break (2834-3145%), high toughness (123.3-167.8 MJ·m), good impact resistance (18.3-20.3 kJ·m), and adequate tensile strength (5.9-6.9 MPa). Furthermore, high thermal stability (253-263 °C) as well as excellent UV and chemical resistance was also found for the polymers. Most interestingly, controlled bacterial biodegradation under exposure of bacterial strains demonstrated them as sustainable materials. Therefore, such biobased novel thermoplastic polyurethane elastomers with self-healing, self-cleaning, and shape memory effects possess great potential for their advanced multifaceted applications.
首次报道了不同组成的含硅生物基超支化聚氨酯热塑性弹性体。通过傅里叶变换红外光谱、核磁共振、X射线衍射和能量色散X射线光谱分析对聚合物结构进行了评估。合成的弹性体具有高分子量（1.11 - 1.38×10 g·mol）和低玻璃化转变温度（-40.0至-27.3°C）。这些聚合物表现出多刺激响应性，具有出色的可重复固有自愈合（100%效率）、形状恢复（100%）和高效自清洁（接触角102° - 107°）能力，同时具有优异的断裂伸长率（2834 - 3145%）、高韧性（123.3 - 167.8 MJ·m）、良好的抗冲击性（18.3 - 20.3 kJ·m）和足够的拉伸强度（5.9 - 6.9 MPa）。此外，还发现这些聚合物具有高热稳定性（253 - 263°C）以及优异的紫外线和耐化学性。最有趣的是，在细菌菌株暴露下的可控细菌生物降解表明它们是可持续材料。因此，这种具有自愈合、自清洁和形状记忆效应的生物基新型热塑性聚氨酯弹性体在其先进的多方面应用中具有巨大潜力。
