Surfactant-free poly(methyl methacrylate)/poly(vinylamine) (PMMA/PVAm) amphiphilic core-shell polymer particles

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• 作者：A. Bonnefond ; C. Pereira Gomes ; J. C. de la Cal ; J. R. Leiza
• 关键词：Polyvinylamine ; Amphiphilic core ; shell nanoparticles ; Polymerization kinetics ; Morphology ; Particle nucleation
• 刊名：Colloid and Polymer Science
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：295
• 期：1
• 页码：135-144
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Polymer Sciences; Soft and Granular Matter, Complex Fluids and Microfluidics; Characterization and Evaluation of Materials; Physical Chemistry; Food Science; Nanotechnology and Microengineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1435-1536
• 卷排序：295

文摘

Surfactant-free emulsion polymerization for the synthesis of poly(methyl methacrylate)/poly(vinylamine) (PMMA/PVAm) amphiphilic core-shell polymer particles is investigated in this work. Particularly, the effect of the PVAm molar mass and the tert-butyl hydroperoxide (TBHP)/PVAm molar ratio on the kinetics of reaction and particle nucleation is studied, and the morphology of the polymer particles carefully analyzed. Interestingly, decreasing the TBHP/PVAm molar ratio leads to faster kinetics of the polymerization reaction. Decreasing the molar mass of PVAm also yields faster kinetics. The morphology of the PMMA/PVAm polymer particles is core-shell like, and the PVAm chains are located at the surface of the polymer particles acting as stabilizer. Thus, the pH affects their morphology and the PVAm chains are fully extended at low pH and hence are swollen by water and have large size, whereas at high pH, the PVAm chains shrink and particle sizes are smaller.