中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Compromise between dominant polymerization mechanisms in preparation of polymer microspheres

文献类型:期刊论文

作者Ma, GH; Li, JH
刊名CHEMICAL ENGINEERING SCIENCE
出版日期2004-04-01
卷号59期号:8-9页码:1711-1721
关键词emulsion suspension particle formation nucleation polymerization morphology
ISSN号0009-2509
其他题名Chem. Eng. Sci.
中文摘要A system consisting of uniform-sized styrene monomer droplets dispersed in an aqueous phase was employed to study the compromise between dominant polymerization mechanisms in the preparation of polymer microspheres. Monomer droplets were prepared by a microporous membrane emulsification technique, with negligible size distribution. Two polymerization mechanisms were identified-polymerization in micro-sized monomer droplets and nano-sized secondary nuclei, even in the presence of a hydrophobic initiator. Factors affecting the compromise between these two dominant mechanisms were investigated. Increasing the amount of hydrophobic additive (hexadecane) and/or adding water-soluble inhibitor in the aqueous phase suppressed the polymerization in the secondary nuclei, while adding a relatively hydrophilic monomer in the styrene feed and/or increasing the amount of the initiator and the size of the monomer droplets promoted the polymerization in the secondary nuclei. Under the condition where a hydrophilic monomer was added, hollow microspheres were formed when polymerization in the secondary nuclei was dominant, while one-hole microspheres resulted when polymerization occurred only inside the larger monomer droplets, indicating that the compromise between dominant mechanisms is critical to the polymerization process. (C) 2004 Published by Elsevier Ltd.
英文摘要A system consisting of uniform-sized styrene monomer droplets dispersed in an aqueous phase was employed to study the compromise between dominant polymerization mechanisms in the preparation of polymer microspheres. Monomer droplets were prepared by a microporous membrane emulsification technique, with negligible size distribution. Two polymerization mechanisms were identified-polymerization in micro-sized monomer droplets and nano-sized secondary nuclei, even in the presence of a hydrophobic initiator. Factors affecting the compromise between these two dominant mechanisms were investigated. Increasing the amount of hydrophobic additive (hexadecane) and/or adding water-soluble inhibitor in the aqueous phase suppressed the polymerization in the secondary nuclei, while adding a relatively hydrophilic monomer in the styrene feed and/or increasing the amount of the initiator and the size of the monomer droplets promoted the polymerization in the secondary nuclei. Under the condition where a hydrophilic monomer was added, hollow microspheres were formed when polymerization in the secondary nuclei was dominant, while one-hole microspheres resulted when polymerization occurred only inside the larger monomer droplets, indicating that the compromise between dominant mechanisms is critical to the polymerization process. (C) 2004 Published by Elsevier Ltd.
WOS标题词Science & Technology ; Technology
类目[WOS]Engineering, Chemical
研究领域[WOS]Engineering
关键词[WOS]SPG EMULSIFICATION TECHNIQUE ; AFFINITY LATEX-PARTICLES ; POLYACROLEIN MICROSPHERES ; GLASS EMULSIFICATION ; CHROMATOGRAPHY ; VACCINE ; PURIFICATION ; MICROENCAPSULATION ; METHACRYLATE ; ADSORPTION
收录类别SCI
原文出处://WOS:000221628600010
语种英语
WOS记录号WOS:000221628600010
公开日期2013-11-05
版本出版稿
源URL[http://ir.ipe.ac.cn/handle/122111/4911]  
专题过程工程研究所_研究所(批量导入)
作者单位Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100080, Peoples R China
推荐引用方式
GB/T 7714
Ma, GH,Li, JH. Compromise between dominant polymerization mechanisms in preparation of polymer microspheres[J]. CHEMICAL ENGINEERING SCIENCE,2004,59(8-9):1711-1721.
APA Ma, GH,&Li, JH.(2004).Compromise between dominant polymerization mechanisms in preparation of polymer microspheres.CHEMICAL ENGINEERING SCIENCE,59(8-9),1711-1721.
MLA Ma, GH,et al."Compromise between dominant polymerization mechanisms in preparation of polymer microspheres".CHEMICAL ENGINEERING SCIENCE 59.8-9(2004):1711-1721.

入库方式: OAI收割

来源:过程工程研究所

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