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首页> 外文期刊>Journal of Applied Polymer Science >Copolymer hydrogel microspheres consisting of modified sulfate chondroitin-co-poly(N-isopropylacrylamide)
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Copolymer hydrogel microspheres consisting of modified sulfate chondroitin-co-poly(N-isopropylacrylamide)

机译：由改性硫酸软骨素-共聚（N-异丙基丙烯酰胺）组成的共聚物水凝胶微球

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摘要

Modified chondroitin sulfate (π-CdS) microspheres were synthesized by way of crosslinking-copolymerization reaction with N-isopropylacrylamide (NIPAAm), yielding CdS-co-PNIPAAm copolymer network. The incorporation of vinyl groups onto the CdS was processed with the use of glycidyl methacrylate (GMA) in an aqueous solution of pH 3.5 under stirring speed of 800 rpm at 50°C. ~(13)C NMR and 1H NMR spectra of CdS treated with the GMA indicated the formation of 3-methacryloyl-1-glyceryl ester of π-CdS and 3-methacryloyl-2-glyceryl ester of π-CdS that are the reaction products resultant of an epoxide ring-opening mechanism via. The synthesis of microspheres was performed via radical reaction of the vinyl groups at the π-CdS with vinyl groups at the NIPAAm in a water-benzyl alcohol microemulsion. The formation of spherical structures is the result of the polymerization-crosslinking reaction of the π-CdS with the NIPAAm monomers at the droplets of water, in view that both reactants have hydrophilic characteristics at the temperature at which the reaction was processed. The pure CdS hydrogel microspheres showed a slightly cracked structure with a lower diameter range while the CdS-co-PNIPAAm hydrogel microspheres showed a flat and tight structure with a more regular mass distribution.
机译：通过与N-异丙基丙烯酰胺（NIPAAm）的交联-共聚反应，合成了改性的硫酸软骨素（π-CdS）微球，得到了CdS-co-PNIPAAm共聚物网络。在50℃下以800rpm的搅拌速度在pH 3.5的水溶液中使用甲基丙烯酸缩水甘油酯（GMA）将乙烯基结合到CdS上。用GMA处理的CdS的〜（13）C NMR和1H NMR光谱表明，形成了π-CdS的3-甲基丙烯酰基-1-甘油酯和π-CdS的3-甲基丙烯酰基-2-甘油酯，它们是反应产物。环的开环机理。微球的合成是通过在水苄醇微乳液中π-CdS上的乙烯基与NIPAAm上的乙烯基进行自由基反应来进行的。球形结构的形成是π-CdS与NIPAAm单体在水滴上的聚合-交联反应的结果，因为两种反应物在反应进行的温度下均具有亲水性。纯CdS水凝胶微球显示出较小的破裂结构，直径范围较小，而CdS-co-PNIPAAm水凝胶微球显示出平坦而紧密的结构，质量分布更规则。

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