Abstract: Copolymer nanoparticles were prepared from kerosene/acrylamide-sodium acrylate/ Span80-Tween60 inverse micro-emulsion system. The structure of the prepared copolymer was studied with infrared spectroscopy (IR) and 13C nuclear magnetic resonance (13C NMR)，the morphology of the copolymer was studied with transmission electron microscopy (TEM)，and the molecular weight as well as molecular weight distribution of the copolymer were studied with gel permeation chromatography (GPC). Homogenous，stable and transparent micro-emulsion was obtained at 40 ℃ when the optimum HLB value required for emulsion stability was 9，the mass concentration of monomer was 40% relative to total mass of the water phase and the mass fraction of (NH4)2S2O8-NaHSO3，as initiator，was 0.7‰ relative to the total mass of monomer. The resultants were acrylamide-sodium acrylate copolymers，with viscosity-average molecular weight of 5×105 g/mol. The copolymer particles were uniformly distributed，as regular spherical shape with nanometer scale particle size.

Key words: polymer nanoparticle, polyacrylamide, inverse micro-emulsion, gel permeation chromatography

摘要： 采用工业煤油/丙烯酰胺-丙烯酸钠/Span80(山梨糖醇酐油酸脂)-Tween60(聚氧乙烯失水山梨醇硬脂酸酯)反相微乳液体系制备聚合物纳米粒子。通过红外光谱、13C核磁共振、凝胶渗透色谱、透射电镜对其进行表征，着重研究共聚物结构、形态、黏均分子量大小和分布情况。结果表明：在40 ℃下，乳液稳定的最佳HLB值为9时，单体占水相总质量的40%，(NH)4S2O8-NaHSO3引发剂占单体总质量的0.7‰，得均一稳定透明的微乳液。产物为丙烯酰胺-丙烯酸钠共聚物，黏均分子量为5.0×105 g/mol，粒子分布均匀，呈规则球形，达到纳米级别。

关键词: 聚合物纳米粒子, 聚丙烯酰胺, 反相微乳液, 凝胶渗透色谱