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Tunable Assembly of Block Copolymer Tethered Particle Brushes by Surface-Initiated Atom Transfer Radical Polymerization
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-05-19 , DOI: 10.1021/acsmacrolett.0c00158 Zongyu Wang 1 , Jaejun Lee 2 , Zhenhua Wang 1, 3, 4 , Yuqi Zhao 2 , Jiajun Yan 1 , Yu Lin 2 , Sipei Li 1 , Tong Liu 1 , Mateusz Olszewski 1 , Joanna Pietrasik 5 , Michael R Bockstaller 2 , Krzysztof Matyjaszewski 1
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-05-19 , DOI: 10.1021/acsmacrolett.0c00158 Zongyu Wang 1 , Jaejun Lee 2 , Zhenhua Wang 1, 3, 4 , Yuqi Zhao 2 , Jiajun Yan 1 , Yu Lin 2 , Sipei Li 1 , Tong Liu 1 , Mateusz Olszewski 1 , Joanna Pietrasik 5 , Michael R Bockstaller 2 , Krzysztof Matyjaszewski 1
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A strategy to synthesize SiO2-g-PMMA/PMMA-b-PS mono- and bimodal block copolymer particle brushes by surface-initiated atom transfer radical polymerization (SI-ATRP) from silica particles is presented. First, PMMA blocks were prepared by normal ATRP with controlled degree of polymerizations and grafting density. In a second step, the PS block was synthesized through a chain extension using low parts per million of Cu catalyst. Variation of the SiO2-g-PMMA-Br macroinitiator concentration had a pronounced effect on the modality of the chain extension product. In the limit of small concentration, partial termination resulted in bimodal brush architectures, while more uniform brush architectures were observed with increasing concentration of macroinitiator. Brush nanoparticles with bimodal architectures assembled into string-like aggregates that bore a resemblance to structures found in systems comprised of sparse (homopolymer) brush particles. The unexpected effect of modality on structure formation points to opportunities in controlling microstructures in brush particle materials.
中文翻译：
表面引发原子转移自由基聚合嵌段共聚物系链粒子刷的可调组装
提出了一种通过表面引发的原子转移自由基聚合（SI-ATRP）从二氧化硅颗粒合成SiO 2 - g -PMMA/PMMA- b -PS 单峰和双峰嵌段共聚物颗粒刷的策略。首先，通过聚合度和接枝密度受控的普通 ATRP 制备 PMMA 嵌段。在第二步中，使用百万分之低的 Cu 催化剂通过扩链合成 PS 嵌段。SiO 2 - g的变化-PMMA-Br 大分子引发剂浓度对扩链产物的形态有显着影响。在小浓度的限制下，部分终止导致双峰刷结构，而随着宏观引发剂浓度的增加，观察到更均匀的刷结构。具有双峰结构的刷状纳米颗粒组装成串状聚集体，与由稀疏（均聚物）刷状颗粒组成的系统中的结构相似。形态对结构形成的出乎意料的影响指出了控制刷颗粒材料中微结构的机会。
更新日期：2020-05-19
中文翻译：
表面引发原子转移自由基聚合嵌段共聚物系链粒子刷的可调组装
提出了一种通过表面引发的原子转移自由基聚合（SI-ATRP）从二氧化硅颗粒合成SiO 2 - g -PMMA/PMMA- b -PS 单峰和双峰嵌段共聚物颗粒刷的策略。首先，通过聚合度和接枝密度受控的普通 ATRP 制备 PMMA 嵌段。在第二步中，使用百万分之低的 Cu 催化剂通过扩链合成 PS 嵌段。SiO 2 - g的变化-PMMA-Br 大分子引发剂浓度对扩链产物的形态有显着影响。在小浓度的限制下，部分终止导致双峰刷结构，而随着宏观引发剂浓度的增加，观察到更均匀的刷结构。具有双峰结构的刷状纳米颗粒组装成串状聚集体，与由稀疏（均聚物）刷状颗粒组成的系统中的结构相似。形态对结构形成的出乎意料的影响指出了控制刷颗粒材料中微结构的机会。
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