高等学校化学学报

高等学校化学学报

• 研究简报 • 上一篇    

分子内环化对聚乙烯醇交联体系的影响

赵大成, 高歌, 李志英, 刘凤岐   

  1. 吉林大学化学学院, 长春 130021
  • 收稿日期:2005-11-09 修回日期:2006-09-19 出版日期:2006-09-10 发布日期:2006-09-10
  • 通讯作者: 刘凤岐

Influences of Intramolecular Cyclization on PVA Crosslinked System

ZHAO Da-Cheng, GAO Ge, LI Zhi-Ying, LIU Feng-Qi   

  1. College of Chemistry, Jilin University, Changchun 130023, China
  • Received:2005-11-09 Revised:2006-09-19 Online:2006-09-10 Published:2006-09-10
  • Contact: LIU Feng-Qi

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摘要： 以聚乙烯醇(PVA)-戊二醛(GA)体系作为研究对象, 系统地研究了分子内环化对凝胶体系的影响, 为水凝胶体系的网络结构评价奠定了一定的实验基础.

关键词: 聚乙烯醇, 水凝胶, 内环化, 临界凝胶点, 平衡溶胀度

Abstract: The influences of intramolecular cyclization on the crosslinking reaction processes and the gel's swelling ratio in polyvinyl alcohol (PVA)-glutaraldehyde(GA) system were studied. The results show that the intramolecular cyclization is a very important factor that has influence on the formation of PVA networks. The lower PVA concentration, the higher intramolecular cyclization degree and higher critical gelation mixing molecular molar ratio of CHO to OH(rc) were obtained. The intramolecular cyclization fractions were increased with the decrease of PVA concentration. Equilibrium swelling ratio decreased with the increase of PVA concentration at the same extent of reaction and the increase of crosslinker concentration at the same PVA concentration. The formation of network can be adjusted with the change of the PVA concentration or the crosslinker concentration.

Key words: PVA, Hydrogel, Intramolecular cyclization, Critical gel point, Equilibrium swelling ratio

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