摘要
泡沫分散聚合法制备超大孔水凝胶的工艺核心为控制凝胶化过程和泡沫化过程的协同作用效果。探讨各影响因素对泡沫分散聚合工艺的影响,利用电镜、密度和溶胀动力学对材料的结构与性能进行表征。结果表明,以聚氧化乙烯/氧化丙烯和微交联羧甲基纤维素钠复配作为泡沫稳定剂,以碳酸氢钠为发泡剂,用量为10%,以N,N′-亚甲基双丙烯酰胺为交联剂,用量为0.6%,此条件下体系凝胶化时间为28 s左右,泡沫体积可达38 mL,两者的协同作用达到最优情况。乙醇洗涤烘干后,所获得凝胶样品具有大量贯穿,均匀分布的超大孔,1.5 min内即可达到溶胀平衡,且孔隙率越高,其密度越低,溶胀速率和溶胀率均越高。
The core of foaming technical which is imposed to prepare superporous hydrogel is master of the coherence of gelation progress and foaming process.The influence of synthetic condition on the crosslinking polymerization and the foam formation was discussed systematically.SEM,apparent density and swelling ratio studies were used to characterize these polymers.The results are as following： polyoxyethylene-polyoxypropylene and crosscarmellose sodiumas as foaming stabilizer,10% NaHCO3 as foaming agents,0.6% N,N′-meth-ylene-bis-acrylamide as crosslinke,in these conditions the gelation time of the reaction system is 28 s,the peak foam volume is 38 mL.The gelation progress can cooperate with the foaming progress in excellent.Then the hydrogel was dehydrated in ethanol and dried.The sample is filled with uniformity pores which connect each other and reach the absorbency equilibrium within 1.5 minute.The polymers which have more pores have higher swelling ratio and rate,but lower density.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2011年第1期24-27,31,共5页
Polymer Materials Science & Engineering
基金
福建省自然科学基金资助项目(2009J01319)
泉州市优秀人才培养专项(08A01)
泉州市技术研究与开发项目(2007G11)
关键词
泡沫分散聚合法
凝胶化过程
泡沫化过程
超大孔水凝胶
dispersion polymerization in foam state
gelation progress
foaming process
superporous hydrogel
