聚N-异丙基丙烯酰胺/类水滑石复合水凝胶的制备及温敏性

doi:10.11944/j.issn.1000-0518.2018.01.170034

摘要/Abstract

摘要：

以类水滑石(LDHs)和N-异丙基丙烯酰胺(NIPA)为原材料,采用自由基引发聚合制得了有机无机PNIPA/LDHs温度敏感复合水凝胶。通过热重分析仪(TGA)、示差扫描量热仪(DSC)和扫描电子显微镜(SEM)等技术手段表征了材料的结构和性能。结果表明,PNIPA/LDHs复合水凝胶在33 ℃左右可实现溶胶-凝胶的可逆性变化,LDHs质量分数基本不影响复合水凝胶的胶凝化温度和胶凝时间。 LDHs添加可使PNIPA/LDHs复合水凝胶的热稳定性较NIPA有大幅度提升。随LDHs质量分数及n(Mg):n(Al)的增加,复合凝胶的吸热峰值稍有增加。所合成PNIPA/LDHs复合水凝胶表面粗糙不平,具有一定的孔洞结构。

关键词: 聚N-异丙基丙烯酰胺, 类水滑石, 水凝胶, 温敏性

Abstract:

To obtain thermosensitive and injectable hydrogels, hydrotalcite(LDHs) and N-isopropylacrylamide(NIPA) were used to synthesize a series of PNIPA/LDHs hydrogels by free radical polymerization. The properties of PNIPA/LDHs hydrogels were characterized by thermal gravimetric analyzer(TGA), differential scanning calorimetry(DSC) and scanning electronic microscopy(SEM). The results show that the synthesized hydrogels have a reversible sol-gel transformation around 33 ℃. LDHs mass ratios have no influence on the temperature and time of gelation. The thermal stability of PNIPA/LDHs is remarkably increased by the addition of LDHs. The endothermic peak of PNIPA/LDHs hydrogels increases with the increase of LDHs mass ratios and the molar ratio of Mg to Al. PNIPA/LDHs hydrogels have porous structures.

Key words: poly-N-isopropylacrylamide, layered double hydroxides, hydrogel, thermosensitivity

段元首, 贾凤霞, 王朔, 李丽芳. 聚N-异丙基丙烯酰胺/类水滑石复合水凝胶的制备及温敏性[J]. 应用化学, 2018, 35(1): 102-108.

DUAN Yuanshou, JIA Fengxia, WANG Shuo, LI Lifang. Synthesis and Thermosensitivity of Poly(N-isopropylacrylamide)/Hydrotalite Hydrogel[J]. Chinese Journal of Applied Chemistry, 2018, 35(1): 102-108.

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