Structure and Properties of Maleic Anhydride Capped Poly(propylene carbonate) Produced by Reactive Extrusion and Effect of Resistance Time on Reaction Efficiency
Structure and Properties of Maleic Anhydride Capped Poly(propylene carbonate) Produced by Reactive Extrusion and Effect of Resistance Time on Reaction Efficiency
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DOI：
10.1021/ie502122j
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发表时间：
2014-09
影响因子：
4.2
通讯作者：
G. Jiang;J. Feng;Shuidong Zhang;Hanxiong Huang
中科院分区：
文献类型：
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作者：
G. Jiang;J. Feng;Shuidong Zhang;Hanxiong Huang
聚碳酸亚丙酯(PPC)是一种环保型热塑性脂肪族聚碳酸酯。为了改善聚碳酸酯的热性能和力学性能，采用反应挤出法制备了马来酸酐封端聚碳酸酯(PPC-MA)。研究了PPC-MA的结构、热性能、力学性能和流变行为。FTIR结果表明，MA成功地封端了PPC。结果表明，PPC-MA的拉伸强度、5%失重温度、储能模数、损耗模数和复合粘度与封端效率和相对分子质量有关。当MA含量在0.5~1份范围内时，ECE值和相对分子质量增大。当MA含量增加到3份时，体系的ECE值和相对分子质量均有所下降。用PPC-MA共混物的流变性表征了不同MA含量下的ECEP反应机理。随着MA含量的增加，PPC-MA的剪切粘度降低。结果表明，反应挤出过程中的停留时间缩短，脱脂效果较好。
Poly(propylene carbonate) (PPC) is an environmental friendly thermoplastic aliphatic polycarbonate. In order to improve its thermal and mechanical properties, PPC end-capped with maleic anhydride (PPC-MA) was prepared by reactive extrusion. Structure, thermal, and mechanical properties and rheological behavior of PPC-MA were investigated. FTIR results show that PPC was successfully end-capped with MA. It revealed that tensile strength, 5% weight loss temperatures, storage modulus, loss modulus, and complex viscosity were dependent on End-Capped Efficiency (ECE) and molecular weight of PPC-MA. When the MA content ranged from 0.5 to 1 phr, ECE and molecular weight increased. The decreases of ECE and molecular weight occurred as the MA content increased to 3 phr. The rheological responses of PPC-MA were used to characterize the mechanism of ECE with different MA content. When the MA content increased, shear viscosity of PPC-MA decreased. As a result, the residence time in reactive extrusion decreased and lea...