Abstract: Controlled free radical polymerization of butyl methacrylate (BMA) was performed by using DPE as molecular weight regulator and AIBN as initiator. The influence of solvent, dosage of DPE and reaction time on polymerization kinetics were studied. Poly (butyl methacrylate) (PBMA) with terminal DPE semiquinoid structure and polydispersity less than 1.43 was obtained. Amphiphilic block copolymer PBMA-b-PDMAEMA with polydispersity of 2.0 was prepared by using PBMA as macroinitiator. The composition of copolymer determined by hydrogen proton nuclear resonance (¹H NMR) was similar to that calculated from gel permeation chromatography (GPC). Two glass transition temperatures of the prepared block copolymer at 11℃ and 35℃ could be detected by differential scanning calorimetry (DSC). Rheological investigation, laser particle size analysis of pigment paste and performance of coating film revealed that dispersing efficiency of phthalocyanine blue pigment in acrylic resin was enhanced greatly by using the prepared PBMA-b-PDMAEMA as dispersant.

Key words: 1,1-diphenylethene, controlled free radical polymerization, amphiphilic block copolymer, dispersion, particle size distribution, rheology

摘要： 以1，1-二苯基乙烯（DPE）为分子量调节剂，偶氮二异丁腈（AIBN）为引发剂进行甲基丙烯酸丁酯（BMA）的可控自由基聚合（DPE法）。研究了溶剂、DPE用量及反应温度对于聚合的影响，得到分子量分布较窄（PDI=1.43）的含有DPE半醌式休眠种结构的聚甲基丙烯酸丁酯（PBMA）。以PBMA为引发剂引发甲基丙烯酸二甲氨基乙酯（DMAEMA）聚合，得到分子量分布较窄的（PDI=2.0）双亲性嵌段共聚物（PBMA-b-PDMAEMA）。核磁共振氢谱（¹H NMR）测得共聚物组成与GPC测试结果相近。差示扫描量热分析（DSC）测试表明嵌段共聚物在11℃和35℃处有两个玻璃化转变温度。色浆的流变和粒径测试及漆膜性能测试表明，将所得双亲性嵌段共聚物作为酞菁蓝颜料分散剂，可以明显提高酞菁蓝颜料在丙烯酸酯树脂中的分散效率。

关键词: 1, 1-二苯基乙烯法, 可控自由基聚合, 双亲性嵌段共聚物, 分散, 粒度分布, 流变学