RAFT法制备偏光用聚乙烯醇与偏光膜性能
DOI:
作者:
作者单位:

中国科学技术大学

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学基金项目


Preparation of Polyvinyl Alcohol for Polarization by RAFT Method and Study on Properties of Polarizing Film
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    以黄原酸酯/BPO引发体系引发醋酸乙烯酯(VAc)自由基可逆加成-断裂-链转移(RAFT)溶液聚合制备PVAc,醇解后制得聚乙烯醇(S-RAFT)。利用凝胶渗透色谱(GPC)测其分子量及其分布。通过1H核磁共振谱研究S-RAFT的立构规整度,使用红外分光光度计研究PVA的聚集态。通过与6种不同PVA原料以及3种市售偏光基膜的立构规整度和聚集态比较,发现S-RAFT和市售光学基膜的PVA原料的立构规整度相似,间同等规立构(rr)含量和结晶度普遍比PVA原料高。比较S-RAFT其他PVA原料及市售基膜制成的偏光膜性能后发现,S-RAFT的成膜性好、偏光度高,具有较高的拉伸模量,有望成为制备高端偏光片的原料。另外通过与VAc传统自由基聚合醇解产物(S-FRP)对比,详细推导以黄原酸酯为链转移剂的RAFT制备高间同结构PVA的过程,提出了黄原酸酯的“顺式热分解”机理。

    Abstract:

    A xanthate/BPO initiator system was used to initiate the reversible addition-fragmentation-chain transfer (RAFT) solution polymerization of vinyl acetate to prepare polyvinyl acetate (PVAc). Alcoholysis of PVAc to produce polyvinyl alcohol(PVA:S-RAFT).Gel Permeation Chromatography (GPC) was hired to analyze the molecular weight and distribution of the samples. 1H-NMR was used to study the tacticity of PVA .The aggregation state of PVA was investigated by FTIR. By comparing the tacticity and aggregation state of 6 different PVA raw materials and 3 commercial polarizing base films, it is found that the tacticity of S-RAFT and the optical base film is similar and the content of syndiotacticity (rr) and crystallinity are higher than that of PVA raw material. After comparing the properties of polarizing films made of S-RAFT, PVA raw materials and commercial base film, it is found that S-RAFT has good film forming properties, high degree of polarization, and high tensile modulus. It is expected to be a raw material for the preparation of high-end polarizers. In addition, by comparing with the structure of PVA with traditional free radical polymerization alcoholysis, the process of preparing high syndiotactic PVA by RAFT using xanthate as chain transfer agent is deduced in detail. A novel "cis Fragmentation" mechanism of xanthate is proposed.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-10-01
  • 最后修改日期:2021-12-17
  • 录用日期:2022-03-26
  • 在线发布日期:
  • 出版日期:
您是第位访问者
编辑出版:《高分子材料科学与工程》编辑部
地址:四川省成都市一环路南一段24号 四川大学高分子研究所
电话:028-8540 1653  E-mail:gfzclbjb@163.net; gfzclbjb@vip.sina.com
高分子材料科学与工程 ® 2022 版权所有
技术支持:北京勤云科技发展有限公司