期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 102, 期 5, 页码 4996-5006出版社
WILEY
DOI: 10.1002/app.25001
关键词
microcapsules; phase change material; styrenemaleic anhydride; polyurethane; interfacial polycondensation
A series of polyurethane microcapsules containing a phase change material (PCM) of n-octadecane was successfully synthesized by an interfacial polymerization in aqueous styrene-maleic anhydride (SMA) dispersion with diethylene triamine (DETA) as a chain extender reacting with toluene-2,4-diisocyanate (TDI). The average diameter of microPCMs is in the range of 5-10 mu m under the stirring speed of 3000-4000 rpm. Optical and SEM morphologies of microPCMs had ensured that the shell was regularly fabricated with the influence of SMA. FTIR results confirmed that the shell material was polyurethane and the SMA chains associated on core material reacted with TDI forming a part of shell material. The shell thickness was decreasing in the range of 0.31-0.55 mu m with the molar ratio of DETA/TDI from 0.84 to 1.35 and the weight of core material increasing from 40 to 80% (wt %). By controlling the weight ratio of PCM as 40, 50, 60, 70, and 80% in microPCMs, it was found using DSC that the T-m and T-c of microPCMs were in the range of 29.8-31.0 C and 21.1-22.0 degrees C and an obvious phase change had been achieved nearly the same temperature range of that of PCM. The results from release curves of microPCM samples prepared by 1.4, 1.7, and 2.0 g of SMA indicated the release properties were affected by the amount of the dispersant, which attributed to the emulsion effect and shell polymerization structure. The above results suggest that the shell structure of microPCMs can be controlled and the properties of microPCMs determined by shell will perform proper practical usage. (c) 2006 Wiley Periodicals, Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据