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ARGET ATRP of Triblock Copolymers (PMMA-b-PEO-b-PMMA) and Their Microstructure in Aqueous Solution
ACS Omega ( IF 3.7 ) Pub Date : 2018-11-27 00:00:00 , DOI: 10.1021/acsomega.8b02489 Qun Lei 1 , Baoliang Peng 1, 2 , Kris King Yiu Ma 3 , Zhen Zhang 3 , Xiaocong Wang 1, 2 , Jianhui Luo 1, 2 , Kam Chiu Tam 3
ACS Omega ( IF 3.7 ) Pub Date : 2018-11-27 00:00:00 , DOI: 10.1021/acsomega.8b02489 Qun Lei 1 , Baoliang Peng 1, 2 , Kris King Yiu Ma 3 , Zhen Zhang 3 , Xiaocong Wang 1, 2 , Jianhui Luo 1, 2 , Kam Chiu Tam 3
Affiliation
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Triblock copolymers poly(methyl methacrylate)-b-poly(ethylene oxide)-b-poly(methyl methacrylate) (PMMA-b-PEO-b-PMMA) with designed molecular weight of PMMA and PEO blocks were synthesized via the activator regenerated by electron transfer (ARGET) atom transfer radical polymerization (ATRP) of MMA. The Br-terminated Br–PEO–Br with the molecular weights of 20k and 100k were used as macroinitiators. ARGET ATRP was performed with ppm level amount CuBr2 as the catalyst and ascorbic acid as the reducing agent to overcome the sensitivity to oxygen in a traditional ATRP. The molecular weight of the PMMA block was manipulated by changing the molar ratio of monomers to the Br–PEO–Br macroinitiators. The synthesis of PMMA-b-PEO-b-PMMA and its structure was confirmed by Fourier transform infrared and 1H NMR, and the molecular weight of the PMMA block was determined by 1H NMR. Aqueous solutions of PMMA-b-PEO-b-PMMA were prepared by solvent-exchange, and their microstructures were examined by tensiometry, static light scattering, and transmission electron microscopy. The effects of molecular weight of the PMMA and PEO blocks on the microstructure were elucidated.
中文翻译：
三嵌段共聚物 (PMMA-b-PEO-b-PMMA) 的 ARGET ATRP 及其在水溶液中的微观结构
采用再生活化剂合成了具有设计分子量的PMMA和PEO嵌段的三嵌段共聚物聚甲基丙烯酸甲酯-b-聚环氧乙烷-b-聚甲基丙烯酸甲酯(PMMA- b - PEO-b-PMMA)。 MMA 的电子转移（ARGET）原子转移自由基聚合（ATRP）。采用分子量为 20k 和 100k 的 Br 封端 Br-PEO-Br 作为大分子引发剂。ARGET ATRP以ppm级CuBr 2作为催化剂，抗坏血酸作为还原剂进行，以克服传统ATRP对氧的敏感性。通过改变单体与 Br-PEO-Br 大引发剂的摩尔比来控制 PMMA 嵌段的分子量。PMMA- b -PEO- b -PMMA的合成及其结构通过傅里叶变换红外和1 H NMR确认，并通过1 H NMR测定PMMA嵌段的分子量。通过溶剂交换制备PMMA- b -PEO- b -PMMA 水溶液，并通过张力测定、静态光散射和透射电子显微镜检查其微观结构。阐明了 PMMA 和 PEO 嵌段的分子量对微观结构的影响。
更新日期：2018-11-27
中文翻译：
三嵌段共聚物 (PMMA-b-PEO-b-PMMA) 的 ARGET ATRP 及其在水溶液中的微观结构
采用再生活化剂合成了具有设计分子量的PMMA和PEO嵌段的三嵌段共聚物聚甲基丙烯酸甲酯-b-聚环氧乙烷-b-聚甲基丙烯酸甲酯(PMMA- b - PEO-b-PMMA)。 MMA 的电子转移（ARGET）原子转移自由基聚合（ATRP）。采用分子量为 20k 和 100k 的 Br 封端 Br-PEO-Br 作为大分子引发剂。ARGET ATRP以ppm级CuBr 2作为催化剂，抗坏血酸作为还原剂进行，以克服传统ATRP对氧的敏感性。通过改变单体与 Br-PEO-Br 大引发剂的摩尔比来控制 PMMA 嵌段的分子量。PMMA- b -PEO- b -PMMA的合成及其结构通过傅里叶变换红外和1 H NMR确认，并通过1 H NMR测定PMMA嵌段的分子量。通过溶剂交换制备PMMA- b -PEO- b -PMMA 水溶液，并通过张力测定、静态光散射和透射电子显微镜检查其微观结构。阐明了 PMMA 和 PEO 嵌段的分子量对微观结构的影响。
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