长支链聚碳酸丁二酯的制备及表征-中国材料进展

文章信息/Info

Title:: Preparation and Characterization of Long Chain Branching Poly(Butylene Carbonate)

Author(s):: LIN Shanshan; YU Wei; ZHOU Chixing; Advanced Rheology Institute, Department of Polymer Science and Engineering,
Shanghai Jiao Tong University, Shanghai 200240, China

摘要:: 脂肪族聚碳酸丁二酯是一种有着广泛应用前景的生物可降解材料，但是材料在加工过程中发生的热降解反应及材料本身存在的熔体强度低、拉伸强度低等缺陷却大大限制了其应用。因此，本文采用反应加工的方式对聚碳酸丁二酯进行改性，通过在共混体系内加入多官能团单体的方法来制备长支化的聚碳酸酯丁二酯。本文探索出了一种用酸酐类和环氧类多官能单体联用的方法，制备得到了高支化度、高分子量的聚碳酸丁二酯，并通过凝胶渗透色谱仪（GPC）及流变学方法表征了长支化结构的产生，并推测了制备长支化聚碳酸丁二酯的官能团反应过程及可能出现的支化结构。研究结果表明，与未改性的聚碳酸丁二酯相比，改性后的样品力学性能得到明显改善，而采用多官能单体联用的方法制备得到的长支化样品的力学性能最优。

Abstract:: Aliphatic poly(butylene carbonate) (PBC) is a kind of biodegradable materials which has a broad application prospects, but the thermal degradation, low melt strength during processing has greatly limited its application. Therefore, in this paper long chain branching (LCB) poly(butylene carbonate) (PBC) was prepared by reactive processing using multi-functional monomers blending. LCB PBC with high molecular weight and long branch was successfully prepared by the successive reactions of the end hydroxyl groups of PBC with pyromellitic dianhydride (PMDA) and triglycidyl isocyanurate (TGIC). Gel permeation chromatography (GPC) and rheology were adopted to characterize the structures of LCB PBC. The reaction mechanism was also suggested.The research results showed that modified PBC samples had better mechanicalproperties, and the properties of LCB PBC are the best.

Key words:poly(butylene carbonate); long chain branching;rheology