摘要
为了研究一种同时具备良好的溶胀率、强的力学性能和灵敏的温敏性能的水凝胶,文中以嵌段聚合物胶束作为交联剂,研究双网络水凝胶的制备方法、结构与性能,通过两步光引发聚合法制备了以聚丙烯酸(PAA)水凝胶为第一网络,聚甲基丙烯酸-N,N-二甲氨基乙酯(PDMAEMA)水凝胶为第二网络的双网络水凝胶。两个网络中所用交联剂均为两端修饰双键的两亲性嵌段共聚物Pluronic F127 (F127DA)。利用扫描电子显微镜(SEM)对所制备凝胶的网络断面形貌进行观察。采用重量法测试了凝胶的溶胀性能。通过测量水凝胶在不同温度下的尺寸变化表征了水凝胶的温敏性。通过应力-应变曲线研究了水凝胶的力学性能。研究结果表明:通过两步法制备嵌段聚合物胶束交联的双网络水凝胶。与单网络水凝胶相比,引入第二网络后的双网络凝胶具有较低的溶胀率(约为16)和较高的力学强度(约为0.38 MPa),较小的伸长率(约为400%)和明显的温度敏感性。
In order to study the preparation method,structure and properties of block polymer micelles cross linked double network hydrogels,a double network model is constructed by a two step photoinduced polymerization method.The first network is composed of polyacrylic acid (PAA) hydrogels and the second network was poly(methacrylic acid) N,N dimethylaminoethyl ester (PDMAEMA) hydrogels.The two networks are both crosslinked by block polymer micelles which are composed of double bond modified Pluronic F127 (F127DA).First,PAA hydrogel is prepared by using F127DA as crosslinking agent,AA as monomer and α ketoglutaric acid as photoinitiator.Second,the second network is formed in situ in PAA network by utilizing F127DA as crosslinking agent,DMAEMA as the monomer and α ketoglutaric acid as photoinitiator.The fracture surface morphology of the prepared hydrogels is observed by a scanning electron microscopy (SEM).The swelling properties of the hydrogels are measured by the gravimetric method.The temperature sensitivity of the hydrogel is characterized by measuring the size variation of hydrogels at different temperatures.The mechanical properties of hydrogels are studied by using the stress strain curve.The results show that the double network hydrogels can be successfully prepared by the two step method.Compared with single network hydrogels,double network hydrogels exhibit lower swelling ratio (~16),higher mechanical strength (~0.38 MPa),smaller elongation at break (~400%) and obvious thermosensitivity.
作者
闫博
周宏伟
金洗郎
陈卫星
马爱洁
YAN Bo;ZHOU Hongwei;JIN Xilang;CHEN Weixing;MA Aijie(School of Materials and Chemical Engineering,Xi’an Technological University,Xi’an,710021,China)
出处
《西安工业大学学报》
CAS
2019年第2期121-127,共7页
Journal of Xi’an Technological University
基金
国家自然科学基金(51603164)
陕西省自然科学基础研究计划项目(2016JQ5036
2017ZDJC-22)
陕西省高校科协青年人才托举计划项目(20170706)
关键词
胶束
双网络
水凝胶
嵌段聚合物
光引发
micelles
double network
hydrogels
block polymers
photoinitiation
