聚碳酸亚丙酯与聚乳酸共混物性能及热分解动力学分析  

Properties and Thermal Decomposition Kinetics of Poly(propylene carbonate) and Poly(lactic acid) Blends

作　　者：桑练勇 晏华 代军 王雪梅 查忠勇 胡志德 SANG Liamyong;YAN Hua;DAI Jum;WANG Xuemei;ZHA Zhongyong;HU Zhide(Army Logistics University of PLA, Chongqing 401331, China;Navy Representative OfficeinWenzhou,Zhoushan 316000,China)

机构地区：[1]中国人民解放军陆军勤务学院,重庆401331 [2]海军驻温州地区军事代表室,浙江舟山316000

出　　处：《中国塑料》2017年第12期39-45,共7页China Plastics

基　　金：海水可降解包装材料研究(X2010193)

摘　　要：采用溶液浇铸法制备了聚碳酸亚丙酯(PPC)/聚乳酸(PLA)共混物,通过力学性能测试、衰减全反射红外光谱分析、差示扫描量热分析和热失重分析研究了共混物的性能,并对共混物进行了热分解动力学研究。结果表明,随着PLA含量的增加,共混物的拉伸强度增大,断裂伸长率减小,PPC/PLA共混物的力学性能得到改善;随着PLA的含量从10%(质量分数,下同)增加到90%,共混物热失重10%所对应的温度(T-10%)从255℃逐渐增加到281℃,当PLA的含量分别为10%、50%和90%时,最大速率失重温度比纯PPC分别提高了3.45、15.51和41.58℃;采用Coats-Redfern法得出,PLA的加入能提高PPC的活化能,其中PLA含量为30%和50%时,共混物的活化能比纯PPC分别提高了12.72%和40.68%,说明PLA改善了PPC的热稳定性。Blends of poly（propylene carbonate）（PPC） and poly（lactic acid）（PLA） were prepared by a solution-casting method, and their properties were investigated by mechanical property test,Fourier-transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis and thermal degradation kinetics. The kinetic data were also analyzed by Coats-Redfernmethod. Tensile testing results indicated that the tensile strength of PPC was improved addition of PLA, whereas its elongation at break decreased. TGA results indicated that the thermal stability of PPC could be enhanced by addition of PLA. The characteristic temperature of PPC corresponding to 10 % weight loss was improved from 255 aC to 281 aC in the presence of PLA at a mass fraction from 10 wt % to 90 wt %, and its characteristic temperature corresponding to the maximum weight loss rate increased by 3. 45, 15. 51 and 41. 58 °C at the PPC/PLA mass ratios of 90/10,50/50 and 10/90, respectively. Coats-Redfern analysis indicated that the activation energy of PPC was improved by 12. 72 % and 40. 68 % when 12. 72 wt % and 40. 68 wt % of PLA were incorporated, respectively. This implicates an improvement in thermal stability of PPC by PLA.

关 键 词：聚碳酸亚丙酯 聚乳酸 共混物 性能 动力学 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]