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Study of the preparation and mechanism of formation of hollow monodisperse polystyrene microspheres by SPG (Shirasu Porous Glass) emulsification technique
Alternative TitleJ. Appl. Polym. Sci.
Ma, GH; Omi, S; Dimonie, VL; Sudol, ED; El-Aasser, MS
2002-08-15
Source PublicationJOURNAL OF APPLIED POLYMER SCIENCE
ISSN0021-8995
Volume85Issue:7Pages:1530-1543
AbstractIn a previous study, it was found that monodisperse polystyrene (PSt) hollow particles can be prepared under special conditions by combining a Shirasu Porous Glass (SPG) emulsification technique and subsequent suspension polymerization process. That is, a mixture of styrene (St), N,N-dimethylamino ethyl methacrylate (DMAEMA), hexadecane (HD), and initiator N,N'-azobis(2,4-dimethylvaleronitrile) (ADVN) was used as the dispersed phase in an aqueous phase containing poly(vinyl pyrrolidone) (PVP), sodium lauryl sulfate (SLS), and water-soluble inhibitor. The dispersed phase was created by pushing the oil phase through the uniform pores of an SPG membrane into the continuous phase to form uniform droplets. Then, the droplets were polymerized at 70degreesC. It has been puzzling that hollow microspheres were obtained only when sodium nitrite (NaNO2) was used as a water-soluble inhibitor, while one-hole particles were formed when hydroquinone (HQ) or diaminophenylene (DAP) was used. In this study, the mechanism of formation of the hollow microspheres was verified by measuring the variation of diameter, molecular weight distribution, and monomer conversion, and by observing morphological changes during the polymerization, as well as by changing the type and amount of hydrophilic monomer, and initiator. It was found that the diameter of the oil droplets decreased, and a large amount of secondary new particles formed immediately after polymerization started in the case of NaNO2, However, there was no such apparent behavior to be observed when HQ or DAP was used. It was determined that the hollow particles formed due to the rapid phase separation between PSt and HD, and as a consequence, a large amount of monomer diffused into the aqueous phase to form the secondary particles. Rapid phase separation confined the HD inside the droplets, a nonequilibrium morphology. On the other hand, one-hole particles, representing an equilibrium morphology, formed when the phase separation occurred slowly because a lot of monomer existed inside of the droplets to allow mobility of the PSt. The addition of DMAEMA allowed the hollow particles to be formed more easily by decreasing the interfacial tension between the copolymer and aqueous phase. (C) 2002 Wiley Periodicals, Inc.; In a previous study, it was found that monodisperse polystyrene (PSt) hollow particles can be prepared under special conditions by combining a Shirasu Porous Glass (SPG) emulsification technique and subsequent suspension polymerization process. That is, a mixture of styrene (St), N,N-dimethylamino ethyl methacrylate (DMAEMA), hexadecane (HD), and initiator N,N'-azobis(2,4-dimethylvaleronitrile) (ADVN) was used as the dispersed phase in an aqueous phase containing poly(vinyl pyrrolidone) (PVP), sodium lauryl sulfate (SLS), and water-soluble inhibitor. The dispersed phase was created by pushing the oil phase through the uniform pores of an SPG membrane into the continuous phase to form uniform droplets. Then, the droplets were polymerized at 70degreesC. It has been puzzling that hollow microspheres were obtained only when sodium nitrite (NaNO2) was used as a water-soluble inhibitor, while one-hole particles were formed when hydroquinone (HQ) or diaminophenylene (DAP) was used. In this study, the mechanism of formation of the hollow microspheres was verified by measuring the variation of diameter, molecular weight distribution, and monomer conversion, and by observing morphological changes during the polymerization, as well as by changing the type and amount of hydrophilic monomer, and initiator. It was found that the diameter of the oil droplets decreased, and a large amount of secondary new particles formed immediately after polymerization started in the case of NaNO2, However, there was no such apparent behavior to be observed when HQ or DAP was used. It was determined that the hollow particles formed due to the rapid phase separation between PSt and HD, and as a consequence, a large amount of monomer diffused into the aqueous phase to form the secondary particles. Rapid phase separation confined the HD inside the droplets, a nonequilibrium morphology. On the other hand, one-hole particles, representing an equilibrium morphology, formed when the phase separation occurred slowly because a lot of monomer existed inside of the droplets to allow mobility of the PSt. The addition of DMAEMA allowed the hollow particles to be formed more easily by decreasing the interfacial tension between the copolymer and aqueous phase. (C) 2002 Wiley Periodicals, Inc.
KeywordSpg Membrane Membrane Emulsification Suspension Polymerization Hollow Polystyrene Microspheres Particle Morphology
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
URL查看原文
Indexed BySCI
Language英语
WOS KeywordMETHACRYLATE) COMPOSITE MICROSPHERES ; MEMBRANE EMULSIFICATION ; POLYMER PARTICLES ; MORPHOLOGY DEVELOPMENT ; INTERFACIAL PHENOMENA ; EMULSION
WOS Research AreaPolymer Science
WOS SubjectPolymer Science
WOS IDWOS:000176210500021
Citation statistics
Cited Times:31[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5632
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Natl Key Lab Biochem Engn, Beijing 100080, Peoples R China
2.Tokyo Univ Agr & Technol, Grad Sch Bi1oapplicat & Syst Engn, Koganei, Tokyo 1848588, Japan
3.Lehigh Univ, Inst Emul Polymers, Bethlehem, PA 18015 USA
4.Lehigh Univ, Dept Chem Engn, Bethlehem, PA 18015 USA
Recommended Citation
GB/T 7714
Ma, GH,Omi, S,Dimonie, VL,et al. Study of the preparation and mechanism of formation of hollow monodisperse polystyrene microspheres by SPG (Shirasu Porous Glass) emulsification technique[J]. JOURNAL OF APPLIED POLYMER SCIENCE,2002,85(7):1530-1543.
APA Ma, GH,Omi, S,Dimonie, VL,Sudol, ED,&El-Aasser, MS.(2002).Study of the preparation and mechanism of formation of hollow monodisperse polystyrene microspheres by SPG (Shirasu Porous Glass) emulsification technique.JOURNAL OF APPLIED POLYMER SCIENCE,85(7),1530-1543.
MLA Ma, GH,et al."Study of the preparation and mechanism of formation of hollow monodisperse polystyrene microspheres by SPG (Shirasu Porous Glass) emulsification technique".JOURNAL OF APPLIED POLYMER SCIENCE 85.7(2002):1530-1543.
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