Liu Dongdong, Zeng Ruiming, Sun Hao, Zhang Li, Tan Jianbo
Department of Polymeric Materials and Engineering, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
Polymers (Basel). 2019 Aug 1;11(8):1284. doi: 10.3390/polym11081284.
Blue light-initiated alcoholic reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of benzyl methacrylate (BzMA) using bis (acyl) phosphane oxide (BAPO) as the photo-initiator is developed to prepare diblock copolymer nano-objects. High monomer conversion (95%) was achieved within 2 h of blue light irradiation in an isopropanol/water mixture. Effects of solvent, light intensity, and reaction temperature on the polymerization kinetics were evaluated. Finally, the effect of reaction temperature on the morphologies of diblock copolymer nano-objects was investigated and two morphological phase diagrams were constructed at 25 and 70 °C. Transmission electron microscopy (TEM) measurement confirmed that increasing the reaction temperature promoted the evolution of higher order morphology. We believe this study will provide more mechanistic insights into alcoholic RAFT dispersion polymerization for the creation of diblock copolymer nano-objects with well-defined structures.
以双（酰基）氧化膦（BAPO）作为光引发剂，开发了蓝光引发的甲基丙烯酸苄酯（BzMA）的醇溶性可逆加成-断裂链转移（RAFT）分散聚合反应，以制备二嵌段共聚物纳米粒子。在异丙醇/水混合物中进行蓝光照射2小时内，单体转化率高达95%。评估了溶剂、光强度和反应温度对聚合动力学的影响。最后，研究了反应温度对二嵌段共聚物纳米粒子形态的影响，并绘制了25℃和70℃下的两个形态相图。透射电子显微镜（TEM）测量证实，提高反应温度促进了高阶形态的演变。我们相信这项研究将为醇溶性RAFT分散聚合反应提供更多的机理见解，以制备具有明确结构的二嵌段共聚物纳米粒子。
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