Permeability of dye through poly(urea-urethane) microcapsule membrane prepared from mixtures of di- and tri-isocyanate

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题名:	Permeability of dye through poly(urea-urethane) microcapsule membrane prepared from mixtures of di- and tri-isocyanate
作者:	Chang, Chih Pong;Chang, Jer Chen;Ichikawa, Kimio;Dobashi, Toshiaki
贡献者:	紡織工程學系
日期:	2005
上传时间:	2009-11-02 11:00:02 (UTC+8)
摘要:	Poly(urea- urethane) microcapsules were prepared by the interfacial polymerization with using mixtures of tri- and di-isocyanate monomers as wall forming materials, and dioetyl phthalate containing an oil-soluble dye as a core material. The time course of the dye release in dispersing tetrahydrofuran was measured as a function of the weight fraction of tri-isocyanate monomer in the total monomer W and the core/wall material-weight ratio g. The dye release curves were well represented by an exponential function C = C-eq(1 - e(-1/tau)), where C is the concentration of the dye in the dispersing medium, C-eq that at equilibrium state, t the elution time and tau is a time constant. tau increased linearly against w at high g, suggesting controllability of the release rate of microcapsules by varying tri-isocyanate/di-isocyanate ratio. (c) 2005 Elsevier B.V. All rights reserved.
關聯:	Colloids and Surfaces B: Biointerfaces v.44 n.4 p.187-190 (38596)
显示于类别:	[紡織工程學系] 期刊論文

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