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首页> 外文期刊>Journal of Applied Polymer Science >Influence of Compositions and Polymerization Processes on Morphologies, Molar Mass Distributions, and Phase Structures of n-Butyl Acrylate-Methyl Methacrylate Copolymers
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Influence of Compositions and Polymerization Processes on Morphologies, Molar Mass Distributions, and Phase Structures of n-Butyl Acrylate-Methyl Methacrylate Copolymers

机译：组成和聚合工艺对丙烯酸正丁酯-甲基丙烯酸甲酯共​​聚物的形态，摩尔质量分布和相结构的影响

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摘要

The target of the research is to examine influence of a polymerization process and monomer ratio on structures and compositions of phases in an emulsion copolymerization of n-butyl acrylate (BA) and methyl methacrylate (MMA). Emulsion copolymerizations are performed using three different BA/MMA weight ratios (60%/40%, 50%/50%, and 40%/60%) and two different processes, statistical batch and seeded emulsion polymerizations. Phase structures, monomer compositions, and morphological stabilities of copolymers are investigated by differential scanning calorimetry, H-1-NMR, and scanning electron microscopy. Gel permeation chromatography is used to follow the changes in the molar mass distribution during syntheses. The gel content and backbiting level of end products are measured by extraction and C-13-NMR, respectively. Copolymerizations give products with a bimodal molar mass distribution and three or two separate phases having different BA/MMA compositions. The morphological stability of particles decreases with the increasing BA fraction in the feed. (C) 2014 Wiley Periodicals, Inc.
机译：该研究的目的是研究丙烯酸正丁酯（BA）和甲基丙烯酸甲酯（MMA）的乳液共聚中聚合工艺和单体比例对相结构和组成的影响。乳液共聚使用三种不同的BA / MMA重量比（60％/ 40％，50％/ 50％和40％/ 60％）和两种不同的工艺进行，即间歇式和种子乳液聚合。通过差示扫描量热法，H-1-NMR和扫描电子显微镜研究共聚物的相结构，单体组成和形态稳定性。凝胶渗透色谱法用于追踪合成过程中摩尔质量分布的变化。终产物的凝胶含量和回咬水平分别通过萃取和C-13-NMR测量。共聚得到具有双峰摩尔质量分布并且具有不同BA / MMA组成的三个或两个分离相的产物。颗粒的形态稳定性随进料中BA分数的增加而降低。 （C）2014威利期刊公司

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