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	Study on preparation of irregular shaped particle in seeded emulsion polymerization accompanied with regulated electrostatic coagulation by counter-ion species
	Ito, F; Ma, GH; Nagai, M; Omi, S
刊名	COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
	2003-04-15
卷号	216期号:1-3页码:109-122
关键词	seeded emulsion polymerization controlled coagulation raising temperature irregular shaped particle counterion species
ISSN号	0927-7757
其他题名	Colloid Surf. A-Physicochem. Eng. Asp.
中文摘要	The seeded emulsion polymerization, basically designed similar to the previous reports except raising the reaction temperature at the end, was conducted for preparing irregular shaped polymer particles incorporating hydrophilic polymer inside the particles as well as on the surface. A 30 wt.% solid and anionic seed latex, poly(methylmethacrylate-co-methyl acrylate), was produced by a conventional emulsion polymerization with anionic initiator and emulsifier. Then, the seeded emulsion polymerization accompanied with the controlled electrostatic coagulation process was carried out with an addition of cationic dimethylaminoethylmethacrylate (DM) and 2,2'-azobis(2-methylamidinopropane) . 2HCl. The coagulation of polymer particles progressed rapidly in the initial 2 h with decreasing the zeta potential of the particles. The polymer yield increased almost linearly until 50% of the monomer was consumed despite the significant decrease in the number of polymer particles. The mechanism of polymerization was speculated on a basis of the nucleation of hydrophilic short chains in the aqueous phase and the slow termination in a polymer particle with the desorption of radicals. The reaction temperature was raised from 333 to 353 K prior to the end of polymerization (1-5 h). The fraction of the irregular-shaped particles in the final latex increased as the duration of raising the temperature was set longer, while the irregularity developed from dumbbell to more progressive shapes. (C) 2002 Elsevier Science B.V. All rights reserved.
英文摘要	The seeded emulsion polymerization, basically designed similar to the previous reports except raising the reaction temperature at the end, was conducted for preparing irregular shaped polymer particles incorporating hydrophilic polymer inside the particles as well as on the surface. A 30 wt.% solid and anionic seed latex, poly(methylmethacrylate-co-methyl acrylate), was produced by a conventional emulsion polymerization with anionic initiator and emulsifier. Then, the seeded emulsion polymerization accompanied with the controlled electrostatic coagulation process was carried out with an addition of cationic dimethylaminoethylmethacrylate (DM) and 2,2'-azobis(2-methylamidinopropane) . 2HCl. The coagulation of polymer particles progressed rapidly in the initial 2 h with decreasing the zeta potential of the particles. The polymer yield increased almost linearly until 50% of the monomer was consumed despite the significant decrease in the number of polymer particles. The mechanism of polymerization was speculated on a basis of the nucleation of hydrophilic short chains in the aqueous phase and the slow termination in a polymer particle with the desorption of radicals. The reaction temperature was raised from 333 to 353 K prior to the end of polymerization (1-5 h). The fraction of the irregular-shaped particles in the final latex increased as the duration of raising the temperature was set longer, while the irregularity developed from dumbbell to more progressive shapes. (C) 2002 Elsevier Science B.V. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Physical
研究领域[WOS]	Chemistry
关键词[WOS]	AQUEOUS DISPERSIONS ; OLIGOMER ; CAPACITY ; MONOMER ; GROWTH
收录类别	SCI
原文出处	://WOS:000182771600012
语种	英语
WOS记录号	WOS:000182771600012
公开日期	2013-11-08
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/5359]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Tokyo Univ Agr & Technol, Grad Sch Bioapplicat & Syst Engn, Koganei, Tokyo 1848588, Japan 2.Chinese Acad Sci, Inst Proc Engn, Natl Key Lab Biochem Engn, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Ito, F,Ma, GH,Nagai, M,et al. Study on preparation of irregular shaped particle in seeded emulsion polymerization accompanied with regulated electrostatic coagulation by counter-ion species[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2003,216(1-3):109-122.
APA	Ito, F,Ma, GH,Nagai, M,&Omi, S.(2003).Study on preparation of irregular shaped particle in seeded emulsion polymerization accompanied with regulated electrostatic coagulation by counter-ion species.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,216(1-3),109-122.
MLA	Ito, F,et al."Study on preparation of irregular shaped particle in seeded emulsion polymerization accompanied with regulated electrostatic coagulation by counter-ion species".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 216.1-3(2003):109-122.

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