高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (10): 1764.

• 研究论文 • 上一篇    下一篇

电场条件下高分子共混物组分浓度梯度化的研究

李治, 孔祥明, 谢续明   

  1. 清华大学化工系高分子研究所教育部先进材料重点实验室, 北京 100084
  • 收稿日期:2000-09-18 出版日期:2001-10-24 发布日期:2001-10-24
  • 通讯作者: 谢续明(1962年出生),男,博士,教授,主要从事高分子物理化学和聚合物新型材料的研究.
  • 基金资助:

    国家自然科学基金(批准号:29604004)资助

Formation of Graded Component in PVA/PAA Polymer Blend Aqueous Solutions under Electric Field

LI Zhi, KONG Xiang-Ming, XIE Xu-Ming   

  1. Institute of Polymer, Key Lab for Advanced Materials of Educational Ministry, Tsinghua University, Beijing 100084, China
  • Received:2000-09-18 Online:2001-10-24 Published:2001-10-24

摘要: 研究了聚乙烯醇/聚丙烯酸高分子共混物水溶液中,共混物各组分在电场诱导条件下沿电场方向的浓度梯度分布情况.通过测定不同时刻PVA/PAA高分子共混物水溶液在电场的不同区域内的pH值,研究了电场诱导下共混物各组分沿电场方向的迁移过程.结果表明,PAAn-向电场正极迁移,同时由于浓差梯度,PVA向负极迁移,并形成浓度梯度分布.随时间的延长,高分子共混物的组分梯度程度逐渐加大.

关键词: 电场, PVA/PAA, 高分子共混物, 梯度

Abstract: The formation of the gradient component in PVA/PAAblend aqueous solution under the electric field has been investigated. The polymer blend aqueous solution was prepared by dissolving PVA/PAA(70/30) in aqueous solution at room temperature. As a kind of polyelectrolytes, PAAcan ionize into PAAn- and nH+ in the PVA/PAAblend aqueous solution. The PAAn- anions should migrate to the anode under the electric field, accompanied with the PVAmoving to the cathode because of the concentration diffusion. The concentration of PAAalong the electric field was determined by measuring the local pHof the aqueous solution. The gradient component distribution was formed in the PVA/PAAblend along the electric field.

Key words: Electric field, PVA/PAA, Polymer blend, Gradient

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