高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (2): 313.

• 论文 • 上一篇    下一篇

聚合温度对聚氯乙烯树脂结构和性能的影响

包永忠, 翁志学, 黄志明, 潘祖仁   

  1. 浙江大学高分子科学与工程研究所, 杭州, 310027
  • 收稿日期:1996-10-09 出版日期:1998-02-24 发布日期:1998-02-24
  • 通讯作者: 包永忠,联系人:男,30岁,博士研究生.
  • 作者简介:包永忠,男,30岁,博士研究生.
  • 基金资助:

    国家自然科学基金(批准号:29290508)资助课题.

Influences of Polymerization Temperature on Some Structures and Properties of Poly(vinyl chloride)Resin

BAO Yong-Zhong, WENG Zhi-Xue, HUANG Zhi-Ming, PAN Zu-Ren   

  1. Institute of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027
  • Received:1996-10-09 Online:1998-02-24 Published:1998-02-24

摘要: 采用凝胶渗透色谱法、13H NMR和DSC法测定了悬浮聚合PVC树脂的平均分子量、间规度、结晶度和玻璃化温度.结果表明:聚合温度下降,PVC的平均分子量上升,分子量的对数值与聚合温度的倒数成正比;PVC的间规度和结晶度均增大,在形成结晶的间规链段的最短长度(ξmin)为6时,由间规度计算的结晶度理论值与测定值接近;分子量和结晶度增加的共同作用,使PVC的玻璃化转变温度上升.

关键词: 聚氯乙烯, 聚合温度, 平均分子量, 间规度, 结晶度

Abstract: Poly(vinyl chloride)(PVC) resins were synthesized at different polymerization temperatures( T ) by suspension process. The average molecular weight ( M ), syndiotacticity, crystallinity and glass transition temperature (Tg) of PVCresin were characterized by GPC, 13 C NMR and DSC methods. The results showed that M decreased as T increased, the logarithmic values of M were proportional to the reciprocal of T, the syndiotacticity, crystallinity and Tg increased with decreasing of T, the calculated crystallinity based on the syndiotacticity approached to the experimental value in the case of the value of the minimum sequence length for syndiotactic chain segment contributing to the crystallites was 6.

Key words: Poly(vinyl chloride), Polymerization temperature, The average molecular weight, Syndiotacticity, Crystallinity

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