中国塑料 ›› 2023, Vol. 37 ›› Issue (11): 1-9.DOI: 10.19491/j.issn.1001-9278.2023.11.001

• 材料与性能 •    下一篇

长链支化聚对苯二甲酸乙二醇酯的制备及其超临界CO2挤出发泡性能研究

冯英健1, 胡冬冬1, 魏少龙1, 钱军2, 熊伟2, 姚舜1(), 赵玲1()   

  1. 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
  • 收稿日期:2023-06-05 出版日期:2023-11-26 发布日期:2023-11-22
  • 通讯作者: 姚舜(1994—),男,博士后,从事聚合物发泡研究,shunyao@ecust.edu.cn
    赵玲(1969—),女,教授,从事多相反应与传递研究,zhaoling@ecust.edu.cn
    E-mail:shunyao@ecust.edu.cn;zhaoling@ecust.edu.cn

Preparation of long⁃chain⁃branched poly(ethylene terephthalate) and its foaming properties by supercritical CO2 extrusion

FENG Yingjian1, HU Dongdong1, WEI Shaolong1, QIAN Jun2, XIONG Wei2, YAO Shun1(), ZHAO Ling1()   

  1. 1.State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China
    2.Sinopec Shanghai Petrochemical Company Limited,Shanghai 200540,China
  • Received:2023-06-05 Online:2023-11-26 Published:2023-11-22
  • Contact: YAO Shun, ZHAO Ling E-mail:shunyao@ecust.edu.cn;zhaoling@ecust.edu.cn

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CO2(scCO2)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4.81×106 个/cm3,平均泡孔直径为153.9 μm。

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

Abstract:

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 long⁃chain⁃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 CO2 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 °C, a cell density of 4.81×106 cells/cm3, and an average cell diameter of 153.9 μm.

Key words: poly(ethylene terephthalate), long?chain?branching, supercritical carbon dioxide, extrusion foaming, high expansion ratio

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