过氧化物引发聚(3-羟基丁酸酯-co-4-羟基丁酸酯)交联及增容共混体系结构与性能的研究

Abstract

来源于可再生资源的聚(3-羟基丁酸酯-co-4-羟基丁酸酯)[P(3HB-co-4HB)]和聚乳酸（PLA）作为生物基高分子材料这一大家族中的优秀代表，因其具有良好的生物降解性和生物相容性而成为具有巨大发展潜力的环境友好型高分子材料，越来越受到人们的重视。然而，作为脂肪族聚酯，P(3HB-co-4HB)和PLA自身存在以下缺陷：热稳定性差，结晶缓慢，尺寸稳定性差，熔体强度低，力学性能差等等，极大地限制了它们的广泛应用。 本论文针对P(3HB-co-4HB)和PLA的不足，提出了利用过氧化物引发交联的方法改变P(3HB-co-4HB)的分子链结构和凝聚态结构，旨在提高其熔体强度和改变其结晶行为；以及将此方法应用到P(3HB-co-4HB)和PLA共混体系，期望两组分间发生交联反应、增强两组分相容性、提高材料力学性能，开发出性能优良的生物可降解材料。由此发展出一种新的生物可降解脂肪族聚酯的改性...Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB)] and poly(L- lactide) (PLA) derived from renewable resources have received considerable attentions due to their good biocompatibility and biodegradability. However, as aliphatic polyesters, the inherent deficiencies of P(3HB-co-4HB) and PLA, such as the limited thermal stability, slow crystallization rate, limited dimensional stability, low melt strength, and poor mechanical properties, etc. have limited their wide applications. In the present dissertation, considering the disadvantages of P(3HB-co-4HB) and PLA, branched/crosslinked P(3HB-co-4HB) was prepared by peroxide to enhance the rheological properties and tailor the crystallization behavior through changing the structure of polymer chain firstly. Secondly, this method was i..