中华医学超声杂志

应用化学 ›› 1991, Vol. 0 ›› Issue (5): 73-76.

• 研究简报 • 上一篇    下一篇

PMMA-b-PTHF/PTHF共混体系中共聚物结晶能力的增强

刘立志, 姜炳政   

  1. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:1990-09-21 修回日期:1991-01-25 出版日期:1991-10-10 发布日期:1991-10-10
  • 基金资助:
    中国科学院重大项目基金;国家自然科学基金

CRYSTALLIZATION OF BLOCK COPOLYMER IN POLY (METHYL METHACRYLATE-b-TETRAHYDROFURAN)/POLYTETRAHYDROFURAN BLENDS

Liu Lizhi, Jiang Bingzheng   

  1. Changchun Institute of Applied Chamistry, Academia Sinica, ChangChun 130022
  • Received:1990-09-21 Revised:1991-01-25 Published:1991-10-10 Online:1991-10-10

PDF

455

摘要： 结晶嵌段共聚物具有一般均聚物所没有的许多特殊结晶行为。虽然,人们很早就已开始对聚氧化乙烯/聚苯乙烯诸类嵌段共聚物的结晶行为进行研究[1-3],但对这类体系相分离规律及结晶行为的认识仍很不够。这主要是因为已研究的体系非常有限,此外,大都为对体系非平衡态结构的研究。所以,尽管Whitmore和Noolandi最近提出了结晶嵌段共聚物及其共混物的平衡形态理论[4],但缺乏实验数据与之比较。

关键词: 聚甲基丙烯酸甲酯, 聚四氢呋喃, 嵌段共聚物, 共混物, 结晶

Abstract: The crystallization behavior of poly (methyl methacrylate-b-tetrahydrofuran) diblockcopolymer (PMMA-b-PTHF) and its blends with PTHF homopolymer has been studiedusing DSC technique.Because the crystallization of the PTHF block of the copolymer isstrongly hampered by the amorphous PMMA block of the copolymer.only a very small peakat very low temperature is observed in its DSC thermogram obtained during cooling, indi-cating a very low nucleation rate and a very low crystallinity.However, it was found thatthe copolymer in PMMA-b-PTHF/PTHF blends crystallizes at a much higher temperatureduring meling and a much higher crystallinity was detected.It may resulte mainly fromthe favorable conformation of the crystallizable block in blends.

Key words: polymethyl methacrylate, polytetrahydrofuran, block copolymer, blend, crystallization

网站版权 © 应用化学     本网站备案：吉ICP备12000082号