摘要： 以 2－（十二烷基三硫代碳酸酯） －2－甲基丙烯酸为链转移剂，利用 RAFT/ 细乳液联合技术合成了相对分子质量分布较窄（PDI ＝ 1.53）的大分子链转移剂聚甲基丙烯酸缩水甘油酯。 再以该大分子为可逆加成－断裂链转移（RAFT）试剂，通过连续加料的方式加入苯乙烯后进一步引发聚合，得到 ＰＧＭＡ－ｂ－ＰＳ 二嵌段共聚物。 采用 GPC、FT-IR、1H-NMR、DSC 等方法对聚合产物进行了表征。 结果表明：合成的聚合物为线型二嵌段共聚物，相对分子质量分布为 1.87，该聚合过程具有活性/可控特征。 DSC 测得二嵌段共聚物具有 2 个玻璃化转变温度（T_g），分别为 77.33 ℃和 98.30 ℃ 。 此外，还考察了单体加料顺序对聚合过程的影响。

关键词: 可逆加成－断裂链转移（RAFT）自由基聚合, 细乳液聚合, 嵌段共聚物, 聚苯乙烯, 聚甲基丙烯酸缩水甘油酯

Abstract: Poly(glycidyl methacrylate)( PGMA)with narrow polydispersity(PDI=1.53) was synthesized in microemulsion system by reversible addition-fragmentation chain transfer(RAFT)polymerization, in which 2-( dodecylthio)-2-methyl propionic acid was used as the chain transfer agent. Then poly(glycidyl methacrylate )-b-poly( styrene)(PGMA-b-PS)diblock copolymer was synthesized using styrene as the second monomer,where the styrene were added by continuous loading method. The effect of monomer-feeding sequence on polymerization was investigated. The diblock copolymers were characterized by gelpermeation chromatography (GPC), indicating that a linear diblock copolymers with molecular mass polydispersity (PDI) of 1. 87 was synthesized. The structure of the copolymer was confirmed by infrared spectrometry (FT-IR and nuclear magnetic resonance spectroscopy(H-NMR). The glass transition temperature(T_g)(77.33℃ and 98. 30 ℃)of the diblock copolymer was measured by differential scanning calorimetry (DSC).

Key words: reversible addition-fragmentation chain transfer polymerization(RAFT);microemulsion polymerization, diblock copolymer polystyrene;poly(glycidyl methacrylate