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Study on preparation of irregular shaped particle in seeded emulsion polymerization accompanied with regulated electrostatic coagulation by counter-ion species
Alternative TitleColloid Surf. A-Physicochem. Eng. Asp.
Ito, F; Ma, GH; Nagai, M; Omi, S
2003-04-15
Source PublicationCOLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
ISSN0927-7757
Volume216Issue:1-3Pages:109-122
AbstractThe 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.; 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.
KeywordSeeded Emulsion Polymerization Controlled Coagulation Raising Temperature Irregular Shaped Particle Counterion Species
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
URL查看原文
Indexed BySCI
Language英语
WOS KeywordAQUEOUS DISPERSIONS ; OLIGOMER ; CAPACITY ; MONOMER ; GROWTH
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000182771600012
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5359
Collection研究所(批量导入)
Affiliation1.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
Recommended Citation
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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