聚N-异丙基丙烯酰胺/SiO_2纳米复合水凝胶的制备及性能

Fabrication and characterization of poly(N-isopropylacrylamide)/SiO_2 nanocomposite hydrogels

用一种简便、通用的方法,以N-异丙基丙烯酰胺为单体,以修饰二氧化硅为交联剂和增强剂,制备出一种具有较高机械强度和良好温度响应性能的聚N-异丙基丙烯酰胺/SiO_2PNIPAm/m-SiO_2纳米复合水凝胶.采用TEM、SEM、傅里叶变换红外光谱、万能实验机和差示扫描量热法,对水凝胶的结构、机械性能和热力学性能,进行了分析、测试和表征.研究结果表明:该复合水凝胶具有孔径均匀分布的三维网状结构(孔径约1μm)、高的机械强度(压缩强度可以达到8MPa)和良好的韧性,并在35℃左右具有明显的相转变行为(去溶胀性能).

In this work,poly(N-isopropylacrylamide)/SiO 2 nanocomposite hydrogel with high mechanical strength and thermo-responsiveness were successfully prepared through a facile and in-expensive methods of in-situ polymerization.The structure,mechanical properties,and thermo-dynamic performance of the resultant samples were analyzed and characterized using SEM,TEM,FT-IR,ASG-J electronic universal testing machine,and DSC.The results indicated that the nanocomposite hydrogel showed a well-defined and interconnected 3D porous network structure with the pore size of 1μm,high compression mechanical strength(8 MPa)and excellent toughness,and a clear phase transition temperature of 35℃.