作　　者： ; ; ; ; ; ; ;

机构地区： 郑州大学材料科学与工程学院

出　　处： 《高分子材料科学与工程》 2013年第4期69-73,78,共6页

摘　　要： 以N-异丙基丙烯酰胺(NIPA)为聚合单体,分别采用连续和间歇方式无皂乳液聚合法制备了单分散性良好且粒径可精确控制的PNIPA纳米凝胶。用原子力显微镜(AFM)和透射电镜(TEM)等方法对纳米凝胶的结构、形貌和粒径及其分布进行了表征,用分子力学模拟法研究了纳米凝胶的分子链发生体积相转变前后分子构象的变化。结果表明,PNI-PA纳米凝胶的粒径随交联剂和乳化剂含量的增加而逐渐减小,连续式制备的PNIPA纳米凝胶比间歇式纳米凝胶的平均粒径小,PNIPA纳米凝胶的较低临界溶解温度(LCST)在32℃左右,PNIPA纳米凝胶分子链在LCST以上严重卷曲,在纳米凝胶分子链中存在很强的非键作用力。 Poly （N-isopropyl acrylamide）（PNIPA） nanogels with good monodispersity and precise particle size were prepared by continuous and intermittent free emulsion polymerization method with N-isopropyl acrylamide （NIPA） as the monomer. The structure, morphology, particle size and size distribution of nanogels were characterized by AFM, TEM etc. Molecular conformation changes in the process of volume phase transition of nanogelS were studied by rdolecular mechanics simulation. The results show that the particle size of PNIPA nanogels decreases with the content of crosslinking agent and emulsifier increasing. The average particle size of PNIPA nanogels synthesized by continuous method is larger than that by intermittent method. The lower critical solution temperature （LCST） of PNIPA nanogels is about 32 ℃. Molecular chains of PNIPA nanogels become curling seriously above LCST. There is much non-bonding interaction in molecular chains of PNIPA nanogels.

关 键 词： 聚 异丙基丙烯酰胺 纳米凝胶 温度敏感 分子模拟

领　　域： [一般工业技术]