Yang Zhihui, Wu Guangfeng
Engineering Research Center of Synthetic Resin and Special Fiber, Ministry of Education, Changchun University of Technology Changchun 130012 P. R. China
RSC Adv. 2020 Aug 4;10(48):28680-28694. doi: 10.1039/d0ra04124f. eCollection 2020 Aug 3.
A synthetic method was developed to prepare biodegradable waterborne polyurethanes (BHPUs) with a high solid content by introducing different molecular weights of poly(ethylene glycol) (PEG) into poly(ε-caprolactone) (PCL)-based polyurethanes. PCL is a semi-crystalline polymer that can be degraded in lipase to prepare biodegradable waterborne polyurethanes. The biodegradability of BHPUs was evaluated, and the results showed that BHPU samples could be degraded in a solution of phosphate-buffered saline (PBS)/lipase but not in PBS. Two different synthesis routes were used to prepare the BHPUs, which resulted in different association relationships between the ionic hydrophilic polymer dimethylol propionic acid (DMPA) and a nonionic hydrophilic polymer (PEG). The influence of the association relationship between DMPA and PEG on the solid content and other BHPU properties was investigated. The results showed that the method of associating all PEG molecules with DMPA increased the crystallization, tensile properties, and water and soil repellency of the BHPU samples. The solid content of the BHPU samples increased from 41% to 52.7%. In addition, PEG with molecular weights of 400 g mol and 1000 g mol had the best effect on the dispersibility and stability of BHPU samples when incorporated into a polyurethane backbone.
通过将不同分子量的聚乙二醇（PEG）引入聚己内酯（PCL）基聚氨酯中，开发了一种制备高固含量可生物降解水性聚氨酯（BHPUs）的合成方法。PCL是一种半结晶聚合物，可在脂肪酶中降解以制备可生物降解的水性聚氨酯。对BHPUs的生物降解性进行了评估，结果表明，BHPU样品可在磷酸盐缓冲盐水（PBS）/脂肪酶溶液中降解，但在PBS中不能降解。采用两种不同的合成路线制备BHPUs，这导致离子型亲水性聚合物二羟甲基丙酸（DMPA）与非离子型亲水性聚合物（PEG）之间存在不同的缔合关系。研究了DMPA与PEG之间的缔合关系对固含量和其他BHPU性能的影响。结果表明，使所有PEG分子与DMPA缔合的方法提高了BHPU样品的结晶度、拉伸性能以及防水和防污性。BHPU样品的固含量从41%提高到了52.7%。此外，分子量为400 g/mol和1000 g/mol的PEG在掺入聚氨酯主链时，对BHPU样品的分散性和稳定性具有最佳效果。
