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物理/化学复合交联剂配比对凝胶温敏性的影响 被引量:2

Effect of feed ratios of physical and chemical cross-linker on temperature-sensitivity of hydrogel
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摘要 采用化学交联剂亚甲基双丙烯酰胺(MBA)和物理交联剂无机纳米黏土硅酸镁锂(LMSH)复配制备聚异丙基丙烯酰胺(PNIPAM)水凝胶。随m(MBA)∶m(LMSH)的质量比由9∶1降至为1∶9,水凝胶的透光度和溶胀度增加。凝胶的内部形态取决于交联剂配比,孔洞尺寸随LMSH含量增加而增加。当m(MBA)∶m(LMSH)的质量比为9∶1和1∶9时,温度脉冲响应性最好,但m(MBA)∶m(LMSH)的质量比为1∶9时凝胶对温度的响应最为敏感,20℃下的储能模量最高。DSC结果表明体积相转变温度(VPTT)均在33℃左右,但VPTT范围随LMSH含量增加而窄化。 Physical cross-inker inorganic nanoclay lithium magnesium slhcate hydrate (LMSH) ano cnemmai cross-linker N,N'-methylene-bis-acrylamide (MBA) with various weight ratios were used together to prepare poly (N-isopropylacrylamide) hydrogel. With decreasing weight ratio of MBA LMSH from 9: 1 to 1:9, the transmittance and swelling degrees of hydrogel increased. When weight ratios of MBA " LMSH are 9 :1 and 1 : 9,the hydrogels show better pulsatile responsibility upon temperature. But the hydrogel with a weight ratio of MBA, LMSH at 1 : 9 shows best temperature-sensitivity and highest storage modulus at Z0~C. The results from DSC show that the volume phase transition temperature(VPTT) of hydrogels also kept at 33℃ or so,but VPTT scope become narrow with the addition of LMSH content.
出处 《功能材料》 EI CAS CSCD 北大核心 2012年第5期558-563,共6页 Journal of Functional Materials
基金 国家自然科学基金资助项目(20774064,50973084) 天津市应用基础及前沿技术研究计划资助项目(09JCZDJC23100) 天津市高等学校科技发展基金资助项目(20080307)
关键词 水凝胶 硅酸镁锂 亚甲基双丙烯酰胺 异丙基丙烯酰胺 温度敏感性 hydrogel lithium magnesium silicate hydrate N, N -methylene-bis-acrylamide N-isopropylacrylamide temperature-sensitivity
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