Characterization of Monodisperse Copolymer Submicrospheres with Branched Structures and Different Glass-Transition Temperatures Prepared by Soap-Free Emulsion Polymerization

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Title:	Characterization of Monodisperse Copolymer Submicrospheres with Branched Structures and Different Glass-Transition Temperatures Prepared by Soap-Free Emulsion Polymerization
Authors:	Liu,YY;Lo,MY;Chen,H
Contributors:	化學工程與材料工程學系
Keywords:	BINARY COLLOIDAL CRYSTALS;PHOTONIC CRYSTALS;DISPERSION POLYMERIZATION;AMPHOTERIC INITIATOR;PARTICLE-SIZE;MICROSPHERES;FABRICATION;NANOPARTICLES;COMPOSITES;POLYMERS
Date:	2011
Issue Date:	2012-03-27 16:26:40 (UTC+8)
Publisher:	國立中央大學
Abstract:	This study was focused on the synthesis of monodisperse poly(n-butyl methacrylate-co-methyl methacrylate) submicrospheres via soap-free emulsion polymerization and on their characterization. The glass-transition temperatures of poly(n-butyl methacrylate) and poly(methyl methacrylate) were approximately 25 and 110 degrees C, respectively. Therefore, submicrospheres with different glass-transition temperatures could be obtained through the variation of the copolymer composition. In addition, relationships between the monomer feed concentration (M(0)) and the Mark-Houwink constant (alpha) for the copolymer submicrospheres were proposed. The molecular weights of the copolymer submicrospheres decreased sharply with an increase in the weight fraction of n-butyl methacrylate. On the contrary, the particle diameter increased linearly from 277 to 335 nm with an increase in the weight fraction of n-butyl methacrylate. The a values decreased with an increase in M(0), and this indicated that the branched structures of the copolymer submicrospheres were easily obtained when M(0) was higher than 0.11 g/mL of water. Consequently, the results of this study are expected to provide useful information for the synthesis of monodisperse copolymer submicrospheres by soap-free emulsion polymerization. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 120: 2945-2953, 2011
Relation:	JOURNAL OF APPLIED POLYMER SCIENCE
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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