摘要
以HEMA和DMC为共聚单体,经自由基聚合和巯基转化反应,制备出侧链含有羟基、巯基和铵根阳离子的水溶性共聚物巯基-聚(甲基丙烯酸-β-羟乙酯-co-甲基丙烯酰氧乙基三甲基氯化铵)(HS-P(HEMA-co-DMC)),通过流变测量和SEM研究了HS-P(HEMA-co-DMC)分别与聚乙二醇双丙烯酸酯(PEGDA)和表面带有负电荷的片状锂皂石(Laponite RD)发生物理/化学交联反应所形成的两种复合水凝胶的流变性能和形貌,结果表明:HS-P(HEMA-coDMC)/Laponite RD复合水凝胶在固体物质质量分数为22%的凝胶储能模量达3468 Pa,损耗因子为0.34,表现出明显的含物理交联点的凝胶黏弹性行为;当固体物质质量分数相同时,HS-P(HEMA-co-DMC)/PEGDA复合水凝胶的储能模量为1484 Pa,损耗因子为0.013,表现出典型的共价交联凝胶的黏弹性行为;HS-P(HEMA-co-DMC)/Laponite RD复合水凝胶比HS-P(HEMA-co-DMC)/PEGDA复合水凝胶具有更致密的孔洞结构.
With HEMA and DMC as comonomers,the water-soluble copolymer mercapto-poly( methacrylic acid-β-hydroxyethyl( HS-P( HEMA-co-DMC)) containing hydroxyl,mercapto and ammonium cations in the side chain was prepared by free radical polymerization and sulfhydryl conversion reaction. The rheological properties and morphology of the two types of composite hydrogels,which were formed by HS-P( HEMA-coDMC) reacting respectively with polyethylene glycol diacrylate( PEGDA) and surface-loaded laponite( Laponite RD) by the physical/chemical cross-linking reaction,were measured by rheometry and SEM. The results showed that the gel storage modulus and loss factor of HS-P( HEMA-co-DMC)/LaponiteRD composite hydrogel were respectively 3468 Pa and 0. 34 with a solid content of 22%,showing obvious viscoelastic behavior of the crosslinked points. At the same solid content,HS-P(( HEMA-co-DMC)/PEGDA composite hydrogel had a storage modulus of 1484 Pa and a loss factor of 0. 013,showing the viscoelastic behavior of a typical covalently crosslinked gel. HS-P(( HEMA-co-DMC)/Laponite RD composite hydrogel had a denser pore structure than HS-P( HEMA-co-DMC)/PEGDA composite hydrogel.
出处
《轻工学报》
CAS
2017年第6期27-34,共8页
Journal of Light Industry
基金
国家自然科学基金项目(21474092)
人事部留学归国人员科技活动项目择优资助项目(002422)
郑州轻工业学院博士基金项目(13501050013)
