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Poly(tertiary amine) as a surface-active multifunctional macro-initiator in Cu2+–amine redox-initiated radical emulsion polymerization of methyl methacrylate

  • Jie Gao
  • Guangqun Zhai
Original Paper
  • 2 Downloads

Abstract

Redox-initiated radical polymerization of methyl methacrylate (MMA) using poly(2-(N,N-dimethylamino)ethyl methacrylate) (PDMAEMA) or poly(N-[3-(N,N-dimethylamino)]propyl methacrylamide) (PDMAPMA) as a surface-active multifunctional reducing agent, vis-à-vis low-molecular-weight (MW) analogs, was performed in aqueous emulsion at 70 °C using CuSO4 or FeCl3 complexes as an oxidizing agent and poly(ethylene glycol) as a nonionic emulsifier, to examine their effect on emulsification, rate of polymerization and the structure of final resultants. The kinetics was followed gravimetrically, while the MW of the resultants was monitored by gel permeation chromatography. CuSO4 complexes exhibited a higher activity than FeCl3 complexes in both cases, and the polymerization evolved at a faster rate than those with low-MW tertiary amines. The MW of the resultants increased by several folds with respect to pristine PDMAEMA or PDMAPMA initially, but adversely decreased with further reaction, owing to the formation of free PMMA chains. The control experiments suggested that the transition metal cation complexes promote the hydrolysis of ester/amide moieties. CuII-catalyzed hydrolysis of PDMAEMA or PDMAPMA occurred steadily during the CuII–PDMAEMA or PDMAPMA redox-initiated radical polymerization of MMA, leading to gradual accumulation of low-MW tertiary amines. During the later stage, the radical polymerization was primarily redox-initiated by pairs of CuII complexes and low-MW tertiary amines, giving rise to the formation of free PMMA chains.

Keywords

(2-(N,N-dimethylamino)ethyl methacrylate (DMAEMA) N-[3-(N,N-dimethylamino)]propyl methacrylamide (DMAPMA)) Multifunctional poly(tertiary amine) Mono-centered redox initiation for radical polymerization Radical emulsion polymerization Catalytic hydrolysis 

Notes

Acknowledgements

This work was supported by the Natural Science Foundation of China (21474010, 21504009), the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Authors and Affiliations

  1. 1.Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and EngineeringChangzhou UniversityChangzhouPeople’s Republic of China
  2. 2.Jiangsu Collaborative Innovation Centre of Photovoltaic Science and Engineering, Changzhou UniversityChangzhouPeople’s Republic of China
  3. 3.National Experimental Demonstration Center for Materials Science and Engineering (Changzhou University)ChangzhouPeople’s Republic of China

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