Organic–inorganic hybrid hydrogels involving poly(N‐isopropylacrylamide) and polyhedral oligomeric silsesquioxane: Preparation and rapid thermoresponsive properties
Organic–inorganic hybrid hydrogels involving poly(N‐isopropylacrylamide) and polyhedral oligomeric silsesquioxane: Preparation and rapid thermoresponsive properties
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DOI：
10.1002/polb.21655
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发表时间：
2009-03
期刊：
影响因子：
--
通讯作者：
K. Zeng;Yuan Fang;Sixun Zheng
中科院分区：
文献类型：
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作者：
K. Zeng;Yuan Fang;Sixun Zheng
合成了3-丙烯酰氧基丙基七(3,3,3-三氟丙基)多面体低聚倍半硅氧烷(POSS)，并将其用作改性剂以提高聚(N-异丙基丙烯酰胺)(PNIPAM)水凝胶的热响应速率。采用N-异丙基丙烯酰胺(NIPAM)、POSS大分子单体和N,N'-亚甲基双丙烯酰胺进行自由基共聚，制备含POSS的PNIPAM交联网络。差示扫描量热法 (DSC) 和热重分析 (TGA) 表明，与普通 PNIPAM 网络相比，含 POSS 的 PNIPAM 网络表现出更高的玻璃化转变温度 (Tg) 和更高的热稳定性。含有 POSS 的 PNIPAM 水凝胶表现出与普通 PNIPAM 水凝胶一样的温度响应行为。值得注意的是，在 POSS 含量适中的情况下，含有 POSS 的 PNIPAM 水凝胶在溶胀、消溶胀和再溶胀实验方面表现出比普通 PNIPAM 水凝胶更快的响应速率。水凝胶热响应性能的改善是基于水凝胶中特定微相分离形态的形成，即杂化水凝胶中的POSS结构单元自组装成高度疏水的纳米域，其充当微孔剂并促进PNIPAM链和水的接触。 © 2009 Wiley periodicals, Inc. J Polym Sci B 部分：Polym Phys 47: 504–516, 2009
3-Acryloxypropylhepta(3,3,3-trifluoropropyl) polyhedral oligomeric silsesquioxane (POSS) was synthesized and used as a modifier to improve the thermal response rates of poly(N-isopropylacrylamide) (PNIPAM) hydrogel. The radical copolymerization among N-isopropylacrylamide (NIPAM), the POSS macromer and N,N′-methylenebisacrylamide was performed to prepare the POSS-containing PNIPAM cross-linked networks. Differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) showed that the POSS-containing PNIPAM networks displayed the enhanced glass transition temperatures (Tg's) and improved thermal stability when compared with plain PNIPAM network. The POSS-containing PNIPAM hydrogels exhibited temperature-responsive behavior as the plain PNIPAM hydrogels. It is noted that with the moderate contents of POSS, the POSS-containing PNIPAM hydrogels displayed much faster response rates in terms of swelling, deswelling, and re-swelling experiments than plain PNIPAM hydrogel. The improved thermoresponsive properties of hydrogels have been interpreted on the basis of the formation of the specific microphase-separated morphology in the hydrogels, that is, the POSS structural units in the hybrid hydrogels were self-assembled into the highly hydrophobic nanodomains, which behave as the microporogens and promote the contact of PNIPAM chains and water. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 504–516, 2009