分子内环化对聚乙烯醇交联体系的影响  

Influences of Intramolecular Cyclization on PVA Crosslinked System

作　　者：赵大成[1] 高歌[1] 李志英[1] 刘凤岐[1] 

机构地区：[1]吉林大学化学学院,长春130021

出　　处：《高等学校化学学报》2006年第9期1788-1790,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20274014)资助

摘　　要：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(r_ c ) 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.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.

关 键 词：聚乙烯醇 水凝胶 内环化 临界凝胶点 平衡溶胀度 

分 类 号：O631[理学—高分子化学]