聚乳酸/聚丁二烯/聚磷酸铵三元共混体系的流变行为  

Rheological Behavior of Poly(lactic acid)/Polybutadiene/Ammonium Polyphosphate Ternary Blends

作　　者：孙果 郑倩南 冯杰 陈中碧 杨文 郝文涛 SUN Guo;ZHENG Qiannan;FENG Jie;CHEN Zhongbi;YANG Wen;HAO Wentao(School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China;Anhui BBCA Biomaterial Co.,Ltd.,Hefei 230009,China)

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009 [2]安徽丰原生物新材料有限公司,安徽合肥230009

出　　处：《塑料工业》2022年第8期51-56,共6页China Plastics Industry

摘　　要：研究聚乳酸(PLA)/聚丁二烯(PB)/聚磷酸铵(APP)三元共混体系的流变行为,对深入理解其结构形成和演化、优化工艺条件有重要意义。将PLA、PB和APP熔融共混,并引入过氧化二异丙苯(DCP)进行动态硫化,进而用转矩流变仪和毛细管流变仪研究了这种三元共混体系的流变行为。结果表明,PB显著降低了PLA熔体的转矩,提高了加工流动性;PLA/PB二元共混体系在180~200℃测试温度范围内呈现假塑性流动行为,流变指数n值变化不大;而PLA/PB/APP三元共混体系则随温度升高发生了从假塑性到胀塑性的转变,n值从小于1转变为大于1。总之,与柔性聚合物共混能够改善PLA的加工流动性;但是提高加工温度,不利于PLA及PLA/PB/APP三元共混体系的高速挤出。The study of rheological behavior of poly(lactic acid)(PLA)/polybutadiene(PB)/ammonium polyphosphate(APP)ternary blends had great significance to the deep understanding of structural formation, evolution and optimization of processing conditions.In this work, PLA were melt blended with PB and APP,and dicumyl peroxide(DCP)was introduced for dynamic vulcanization.Furthermore, the rheological behavior of the ternary blends was investigated by torque rheometer and capillary rheometer.The results show that PB significantly reduces the torque of PLA melt and improves the processing fluidity of PLA.The PLA/PB binary blend system shows pseudoplastic flow behavior in the test temperature range from 180 to 200 ℃,and the rheological index n changes a little.The flow behavior of PLA/PB/APP ternary blends changes from pseudoplasticity to dilation with the temperature increasing, and the n value changes from less than 1 to more than 1.In summary, the processing fluidity of flame retardant and toughened PLA composites can be improved via blending with flexible polymer.However, increasing the processing temperature is not favorable for the high-speed extrusion of the composites.

关 键 词：聚乳酸 复合材料 流变行为 聚丁二烯 聚磷酸铵 

分 类 号：TQ321.2[化学工程—合成树脂塑料工业]