高等学校化学学报 ›› 1997, Vol. 18 ›› Issue (9): 1551.

• 论文 • 上一篇    下一篇

PET/PA66/液晶共聚酯酰胺共混体系的流变性能

解孝林1, 申屠宝卿1, 李伯耿1, 潘祖仁1, 吴大诚2   

  1. 1. 浙江大学高分子科学与工程研究所, 聚合反应工程国家重点实验室, 杭州 310027;
    2. 四川联合大学轻纺学院, 成都 610065
  • 收稿日期:1996-07-22 出版日期:1997-09-24 发布日期:1997-09-24
  • 通讯作者: 解孝林, 男, 32岁, 博士后.
  • 作者简介:解孝林, 男, 32岁, 博士后.
  • 基金资助:

    国家重点化学工程联合实验室聚合反应工程实验室资助

Rheological Properties of PET/PA66/Liquid Crystalline Copolyesteramide Blends

XIE Xiao-Lin1, SHEN TU Bao-Qing1, LI Bo-Geng1, PAN Zu-Ren1, WU Da-Cheng2   

  1. 1. State Key Lab. of Polym. Reaction Eng., Institute of Polym.Set. and Eng., Zhejiang Univer.vity, Hangzhou 310027;
    2. Light Industrial and Textile Institute, Sichuan Ltnion University. Chengdu, 610065
  • Received:1996-07-22 Online:1997-09-24 Published:1997-09-24

摘要: 采用SEM、热台偏光显微镜研究了聚对苯二甲酸乙二酯(PET)/聚酰胺66(PA66)/热致液晶共聚脂酰胺(LC30)三元共混物的形态结构;利用Instron3211型毛细管流变仪研究了共混物的流变性能, 结果表明:PET/PA66/LC30共混物为一热力学不相容的多相聚合物体系, LC30的加入提高了PET/PA66的相容性, 有效地改善了PET/PA66共混物的流变性能.PET/PA66/LC30三元共混物熔体的流变曲线由低剪切速率下的切力变稀区和表现粘度基本恒定的准牛顿区组成, 其表现粘度对共混组成的依赖性由PET/PA66共混物的负偏差行为转变为正偏差行为.共混物的形态结构、界面特征不同, 导致共混体流变性质的差异.

关键词: 液晶共聚酯酰胺, 聚对苯二甲酸乙二酯, 聚酰胺66, 共混物, 流变性能

Abstract: The blends of poly(ethylene terephthalate) (PET), polyamlde 66 (PA66) andliquid crystalline copolyesteramide (LC30) were prepared by mechanical mixing. Theirmorphology and rheological properties were investigated by means of SEM, cross polarizingoptical microscope with hot-stage and Instron3211 type capillary rheometer. The results showthat PET/PA66/LC30 is an incompatible multiphase blending system in thermo dynamics.The compatibility and rheological properties of PET/PA66 blends are greatly improved byadding LC30. The viscosity curves of PET/PA66/LC30 melts consist of two regions: a shearthinning region at low shear rate and a"pseudo Newtonian" region. PET/PA66/LC30 blendsshow the character of the positive deviation blends (PDB), whereas PET/PA66 blends showthe character of the negative deviation blends (NDB). The rheological properties of theseblends are affected by their morphologlcal structure.

Key words: Liquid crystalline copolyesteramide, Poly (ethylene terephthalate), Polyamide66, Blends, Rheologlcal property

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