聚乙烯醇水凝胶自修复性能.pdf

化工.进展
2016年第35卷第8期
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2507
研究开发
2400lo90va
聚乙烯醇水凝胶自修复性能
龚桂胜,刘景勃,钟玉鹏,林强,张发爱
(桂林理工大学材料科学与工程学院,广西桂林541004)
摘要:高浓度聚乙烯醇(PVA)水凝胶具有一定的修复功能,但其自修复机理及制备工艺参数对其修复性能的影
响缺乏研究。本文采用冷冻-解冻法制备了高浓度自修复PVA水凝胶,通过调整PVA水凝胶制备エ艺参数(PVA
分子量、PVA浓度、冷冻时间、解冻时间、冷冻-解冻次数、修复时间、冷冻温度等)得到了最佳工艺条件,分
析了水凝胶自修复机理,并研究了PVA水凝胶的多次自修复性能。研究结果表明:相对分子质量大的PVA制备
的水凝胶自修复性能好;其中冷冻时间为2h,解冻时间为h,一次冷冻解冻循环制备得到的水凝胶自修复性能
最好,最住修复时间为12h,能较好地进行反复自修复。指出水凝胶自修复性能主要是由其内部可逆键的相互
作用形成的,其主要影响源于冷冻-解冻处理后水凝胶内部羟基合量及PVA分子的流动性。
关键词:聚乙烯醇;自修复;水凝胶;制备;机理
中图分类号:0643文献标志码:A文章编号:1000-613(2016)08-2507-06
DOI:10.16085is-1000613.2016.08.31
Self-healing performance of poly(vinyl alcohol)hydrogel
GONG Cuisheng, L1U Jingbo, ZHONG Yupeng, LIN Qiang, ZHANG Faai
College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China)
Abstract: The high concentration of poly( vinyl alcohol)hydrogels possesses self-healing propert
However, its self-healing mechanism and the effects of the preparation conditions on the self-healing
property of the hydrogel were rarely studied In this paper, the high concentration PVA hydrogel was
repared by the freezing and thawing method. The optimum conditions were obtained by changing the
preparation conditions (the PVA molecular weight, PVA concentration, freezing time, thawing time
numbers of freezing and thawing cycles, healing time, freezing temperature, etc. and the self-healing
mechanism was analyzed. The multiple self-healing performance of the hydrogel was also investigated
The results showed that the larger the molecular weight of the PVA, the better the self-healing
performance of the hydrogels. The hydrogels prepared under 2h freezing and Ih thawing in only one
cycle showed the best self-healing performance, and the best healing time was 12h. The PVA hydrogel
could self-heal for many times. The self-healing property of the hydrogel was due to the interaction of
reversible hydrogen bond, which was mainly influenced by the content of hydroxyl group and the
mobility of the PVA molecules in the hydrogel
Key words: poly(vingl alcohol)(PVA); self-healing: hydrogels; preparation; mechanism
材料在使用过程中总会受到一些外在因素的
影响而对材料造成一定程度的损伤,而这轻微的损收稿日期:2015112.1修改稿日期:2015129
伤会影响材料的正常使用,同时也会导致材料的浪
基金项目:国家自然科学基金项?(51263004)
费。因此,具有自修复功能特性的材料应运而生。
第一作者:龚桂胜(1990-),男,硕土研究牛.。联系人:张发爱,教
授,博士生导师,主要从事聚合物纳米复合材料、天然产物化学、自
自修复功能是指当物体受到了外界的损伤后可以在愈合聚合物的研究, E-mail Zhangfaai(@6com