摘要： 以苯乙烯（Ｓｔ）、丙烯酸丁酯（ＢＡ）、甲基丙烯酸甲酯（ＭＭＡ）、丙烯酸（ＡＡ）原料，以 Ｎ－羟甲基丙烯酰胺（ＮＭＡ）为功能性单体，用十二烷基硫酸钠（ＳＤＳ）为乳化剂，过硫酸铵（ＡＰＳ）为引发剂，采用种子乳液聚合法合成了高固含量交联型苯丙微乳液。研究了种子聚合阶段引发剂用量、种子用量、Ｓｔ用量、ＮＭＡ用量对微乳液性能的影响，利用粒径分析仪、红外光谱（ＦＴ－ＩＲ）、差示热量扫描（ＤＳＣ）等对微乳液进行了表征。结果表明：在乳化剂用量为单体总量 １％的条件下合成的微乳液固含量为 ４３.６％，平均粒径 ６９.７ｎｍ，分散度 ０.０７９；合成的苯丙微乳液所有单体发生共聚反应，机械稳定好。

关键词: 种子聚合；微乳液；粒径；黏度；吸水率

Abstract: The title high solid crosslinkable microemulsion styrene/acrylate copolymer emulsion was pre-gared by use of styrene(St), methyl acrylateMMA), butyl acrylate (BA), acrylic acid (AA )and N-hydroxymethyl acrylamide( NMA)as co-monome and ammonium persulfate APS)as initiator, sodium do-decyl sulfate( SDS as emulsifier in a process of seed emulsion polymerization. The effects of the dosage of the initiator in seed polymerization, the amount of seed monomer, St and NMA on the property of the emul-sion were discussed. The microemulsion was characterized by FT-IR, DSC and particle size analyzer. The results showed that the average particle size of the microemulsion was 69. 7 nm, polydiversity is0.079,and solid content is 43. 6%o when the emulsifier dosage was 1%o of the total monomer. All the monomers were co-polymerized, showing a good mechanical stability.

Key words: seed polymerization; microemulsion; particle size; viscosity; water absorption rate