长链支化聚对苯二甲酸乙二醇酯的制备及其超临界CO_(2)挤出发泡性能研究  

Preparation of long-chain-branched poly(ethylene terephthalate)and its foaming properties by supercritical CO_(2) extrusion

作　　者：冯英健 胡冬冬[1] 魏少龙 钱军[2] 熊伟 姚舜 赵玲[1] FENG Yingjian;HU Dongdong;WEI Shaolong;QIAN Jun;XIONG Wei;YAO Shun;ZHAO Ling(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;Sinopec Shanghai Petrochemical Company Limited,Shanghai 200540,China)

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237 [2]中国石化上海石油化工股份有限公司,上海200540

出　　处：《中国塑料》2023年第11期1-9,共9页China Plastics

摘　　要：以具有支化结构的多元醇原位聚合改性聚对苯二甲酸乙二醇酯(MPET)为原料,均苯四甲酸二酐(PMDA)为扩链剂,通过反应挤出改性可控制备了不同长链支化程度的聚对苯二甲酸乙二醇酯(PET)。流变测试结果表明长链支化改性MPET熔体黏弹性得到大幅度提升,应变硬化因子也随长链支化程度的增加而增强。在超临界CO_(2)(scCO_(2))挤出发泡过程中,长链支化改性MPET具有优异的挤出可发泡性。采用0.3%(质量分数,下同)PMDA制备得到的MPET-P3具有最佳的挤出发泡性能。当熔体温度为265℃时,其发泡倍率可达14.0倍,泡孔密度为4.81×10^(6)个/cm^(3),平均泡孔直径为153.9μm。Long-chain-branched poly(ethylene terephthalate)(PET)was controllably prepared through reactive extrusion by a combination of in-situ polymerization of polyol-modified PET with a branched structure as a raw material and pyromellitic dianhydride(PMDA)as a chain extender.Rheological test results indicated that the melt viscoelasticity of longchain-branched MPET was greatly improved,and its strain hardening factor was also enhanced with an increase in the long chain branched degree.During the supercritical CO_(2) extrusion foaming process,the long-chain-branched modified MPET exhibited excellent extrusion foamability.The MPET foam prepared with 0.3 wt%PMDA(MPET-P3)presented the best extruded foaming performance,which obtained an expansion ratio of 14.0 at 265℃,a cell density of 4.81×10^(6) cells/cm^(3),and an average cell diameter of 153.9μm.

关 键 词：聚对苯二甲酸乙二醇酯 长链支化 超临界二氧化碳 挤出发泡 高发泡倍率 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]