高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (7): 1449.

• 研究论文 • 上一篇    下一篇

pPDA/ODA-PMDA嵌段共聚酰亚胺薄膜的聚集态结构

翟燕1,2, 朱蓉琪1, 顾宜1   

  1. 1. 四川大学高分子科学与工程学院, 高分子材料工程国家重点实验室, 成都 610065;
    2. 太原工业学院, 太原 030008
  • 收稿日期:2008-11-26 出版日期:2009-07-10 发布日期:2009-07-10
  • 通讯作者: 顾宜, 男, 教授, 主要从事耐热性高分子、热固性聚合物、树脂基复合材料及功能性高分子材料研究. E-mail: guyi@scu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 50433010)资助.

Morphology of pPDA/ODA-PMDA Block Copolymer

ZHAI Yan1,2, ZHU Rong-Qi1, GU Yi1*   

  1. 1. State Key Laboratory of Polymeric Materials Engineering, College of Polymer Scicence & Engineering, Sichuan University, Chengdu 610065, China;
    2. Taiyuan Institute of Technology, Taiyuan 030008, China
  • Received:2008-11-26 Online:2009-07-10 Published:2009-07-10
  • Contact: GU Yi. E-mail: guyi@scu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 50433010)资助.

摘要:

通过控制2个组分的序列长度, 制备了pPDA(对苯二胺)/ODA(4,4′-二氨基二苯醚)-PMDA(均苯四羧酸二酐)嵌段共聚酰亚胺(b-PI). 采用偏光显微镜(PLM)、广角X射线衍射(WAXD)、透射电子显微镜(TEM)和力学性能测试研究了b-PI薄膜的聚集态结构. 结果表明, 所有b-PI薄膜均可结晶, 生成微晶或不完善的小球晶. 刚性棒状的pPDA-PMDA分子链段发生相分离, 形成晶核, 半刚性的ODA-PMDA分子链以pPDA-PMDA为晶核进行晶粒生长. 在结晶过程中, 晶核数目取决于pPDA/ODA比值及pPDA-PMDA(PP)链段长度, 而晶粒尺寸依赖于ODA-PMDA链段(PO)的运动能力. 通过调节二元胺的比例及2个嵌段组分的序列长度, 可以对薄膜的聚集态结构实现可控制备, 从而达到对性能的控制.

关键词: 嵌段共聚酰亚胺; 聚集态; 结晶

Abstract:

pPDA/ODA-PMDA block copolymers(b-PIs) with different segment length of two components were prepared. Morphology and properties of their films were investigated by polarizingmicroscope(PLM), wide-angle X-ray diffraction(WAXD), transmission electron microscope(TEM) and tensil test. Measured results show all films of b-PI are crystalline. At first, phase separation of rigid segment of pPDA-PMDA takes place, forming nuclei. Then, semi-rigid segment of ODA-PMDA grows around the nuclei and forms small and imperfection grains. The number of nuclei is dependent of the ratio between pPDA and ODA and segment length of pPDA-PMDA(PP), while the size of grains is depended on the movability of ODA-PMDA(PO)segment. Morphology and properties of films can be controlled by changing the ratio of dianmines and segment length of two components.

Key words: pPDA/ODA-PMDA block copolymer; Morphology; Crystalline

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