研究具有较高 LCST 且响应速率快的温敏性水凝胶.以NaCl水溶液为反应介质,采用相分离法合成了多孔水凝胶 P (NIPA-co-SA).利用傅立叶变换红外光谱仪(FT-IR)表征产物结构,并借助扫描电子显微镜、差示扫描量热法(DSC)、浊度法等手段研究了反应介质浓度对产物微观形貌、相变温度和相变响应速率的影响规律.结果表明,P(NIPA-co-SA)水凝胶具有对温度敏感的响应特性,其低临界溶解温度(LCST)可达到75℃.NaCl 水溶液浓度不影响产物的LCST,且随着反应中 NaCl 水溶液浓度的提高,水凝胶表面逐渐出现不连续的浅而封闭的小孔到互相贯穿的开孔,水凝胶相变响应速率在一定范围内逐渐提高,具有快速响应特性.
Temperature sensitive hydrogel with high LCST and rapid responsiverate was studied.The porous hy-drogel P (NIPA-co-SA)was synthesized by phase separation method with NaCl solution as reaction medium. The structure of product was identified by FT-IR.The influences of the reaction medium concentration on mi-crostructure,LCST and phase transformation response rate of productswere studied by scanning electron micro-scope,differential scanning calorimetry (DSC)and turbidity method.The results show that P(NIPA-co-SA) hydrogel has sensitive response to temperature,which LCST was up to about 75 ℃.The concentration of NaCl solution doesn’t influence the LCST of product.However,along with the increase of NaCl concentration,shal-low discontinuous airtight ostioles gradually appear on the surface of hydrogel,which change to open pores throughout each other.The phase transformation response rate of hydrogel gradually increases in certain de-gree,which has rapid response character.
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