Institute of Polymer and Dye Technology, Lodz University of Technology, Stefanowskiego 12/16, 90-924, Lodz, Poland.
Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA, 15213, USA.
Macromol Rapid Commun. 2019 Jan;40(2):e1800331. doi: 10.1002/marc.201800331. Epub 2018 Jul 4.
The evolution of particle morphology occurring during polymerization-induced self-assembly (PISA) of a block copolymer poly(oligo(ethylene glycol) methacrylate)-b-poly(benzyl methacrylate) (POEGMA-b-PBzMA) is studied. A well-controlled reversible addition-fragmentation chain transfer (RAFT) polymerization yields nano-objects with various morphologies: spheres, aggregates, worm-like structures, and vesicles. A comparison of the morphology of the nano-objects formed from two different chain-length stabilizers established that the unreacted monomer played an important role during the morphology transitions, which is contrary to previous observations. In addition, morphology evolution to higher-order structures could be attained simply by extending the reaction time, after reaching full monomer conversion.
研究了嵌段共聚物聚（聚乙二醇甲基丙烯酸酯）-b-聚（苄基甲基丙烯酸酯）（POEGMA-b-PBzMA）在聚合诱导自组装（PISA）过程中颗粒形态的演变。通过可控的可逆加成-断裂链转移（RAFT）聚合，可以得到具有各种形态的纳米物体：球体、聚集体、蠕虫状结构和囊泡。对两种不同链长稳定剂形成的纳米物体的形态进行比较，确定了未反应单体在形态转变过程中起着重要作用，这与之前的观察结果相反。此外，在达到完全单体转化率后，通过延长反应时间，也可以实现向更高阶结构的形态演变。
