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首页> 外文期刊>Journal of Applied Polymer Science >Core-shell particles of poly(methyl methacrylate)-block-poly(n-butyl acrylate) synthesized via reversible addition-fragmentation chain-transfer emulsion polymerization and the polymer's application in toughening polycarbonate
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Core-shell particles of poly(methyl methacrylate)-block-poly(n-butyl acrylate) synthesized via reversible addition-fragmentation chain-transfer emulsion polymerization and the polymer's application in toughening polycarbonate

机译：可逆加成-断裂链转移乳液聚合合成聚（甲基丙烯酸甲酯）-嵌段-聚（丙烯酸正丁酯）的核-壳颗粒及其在增韧聚碳酸酯中的应用

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Poly(methyl methacrylate) (PMMA) block copolymer is interesting because it is compatible with many polymers. A series of poly(methyl methacrylate)-b-poly(n-butyl acrylate) (PMMA-b-PnBA) diblock copolymers with various compositions was synthesized via reversible addition-fragmentation chain-transfer (RAFT) emulsion polymerization with the amphiphilic oligo(methacrylic acid(41)-b-methyl methacrylate(8)) RAFT agent as both the polymerization mediator and surfactant. The molecular weights of the block copolymers agreed well with the theoretical prediction, although the polydispersity indices were relatively broad. The resulting core [poly(n-butyl acrylate)]-shell (PMMA) particles of PMMA-b-PnBA were found to be very effective impact modifiers for polycarbonate (PC). The diblock copolymer was well dispersed in 100-300-nm particles in the PC matrix, and the dispersed particle size was highly dependent on the block copolymer compositions. PMMA(250)-b-PnBA(550) (the subscripted number signifies the designed degree of polymerization), which was dispersed into 100-nm particles, presented the best capability for improving the impacting properties. Compared with the neat PC, the notched impact strength of PC toughened by 5 wt % PMMA(250)-b-PnBA(550) was increased by four times to 62.81 kJ/m(2) with the same yield strength, a slightly decreased modulus, an increased elongation at break, and an increased tensile strength. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 132, 42833.
机译：聚甲基丙烯酸甲酯（PMMA）嵌段共聚物很有趣，因为它与许多聚合物相容。通过两亲性低聚物的可逆加成-断裂链转移（RAFT）乳液聚合，合成了一系列具有各种组成的聚（甲基丙烯酸甲酯）-b-聚（丙烯酸正丁酯）（PMMA-b-PnBA）二嵌段共聚物。甲基丙烯酸（41）-甲基丙烯酸b-甲基丙烯酸酯（8））RAFT剂既可作为聚合介质，也可作为表面活性剂。嵌段共聚物的分子量与理论预测吻合得很好，尽管多分散指数相对较宽。发现所得的PMMA-b-PnBA的核[聚（丙烯酸正丁酯）]-壳（PMMA）颗粒是聚碳酸酯（PC）非常有效的抗冲改性剂。二嵌段共聚物很好地分散在PC基质中的100-300 nm颗粒中，并且分散的粒度高度依赖于嵌段共聚物的组成。 PMMA（250）-b-PnBA（550）（下标数字表示设计的聚合度）分散在100 nm的颗粒中，具有改善冲击性能的最佳能力。与纯净PC相比，经5 wt％PMMA（250）-b-PnBA（550）增韧的缺口冲击强度增加了四倍，达到62.81 kJ / m（2），屈服强度相同，略有下降弹性模量，增加的断裂伸长率和增加的拉伸强度。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，132，42833。

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