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pH值对正十八烷微胶囊合成与性能的影响
引用本文:王学晨,张兴祥,张晓春,樊耀峰,牛建津. pH值对正十八烷微胶囊合成与性能的影响[J]. 应用化学, 2005, 22(9): 942-0
作者姓名:王学晨  张兴祥  张晓春  樊耀峰  牛建津
作者单位:天津工业大学
基金项目:国家自然科学基金资助项目(50073015),天津市科技攻关计划资助项目(033101811)
摘    要:pH值对正十八烷微胶囊合成与性能的影响;微胶囊;相变材料;正十八烷

关 键 词:pH值对正十八烷微胶囊合成与性能的影响  微胶囊  相变材料  正十八烷  
文章编号:1000-0518(2005)09-0942-04
收稿时间:2009-06-29
修稿时间:2004-11-06

Effects of pH on Synthesis and Properties of Microencapsulated n-Octadecane
WANG Xue-Chen,ZHANG Xing-Xiang,ZHANG Xiao-Chun,FAN Yao-Feng,NIU Jian-Jin. Effects of pH on Synthesis and Properties of Microencapsulated n-Octadecane[J]. Chinese Journal of Applied Chemistry, 2005, 22(9): 942-0
Authors:WANG Xue-Chen  ZHANG Xing-Xiang  ZHANG Xiao-Chun  FAN Yao-Feng  NIU Jian-Jin
Affiliation:WANG Xue-Chen~*,ZHANG Xing-Xiang,ZHANG Xiao-Chun,FAN Yao-Feng,NIU Jian-Jin
Abstract:The effects of pH on the emulsion and prepolymer solution stability,morphologies and(properties) of the microcapsules were studied in the fabrication of microencapsulated n-octadecane by in-situ polymerization of melamine-formaldehyde.The pH value in the range of 6.5~9.0 does not significantly affect the stability of the emulsion.The prepolymer of melamine-formaldehyde is easy to polymerize in the acid(solution),however,it is hard to polymerize in the alkaline solution.The separation time of the prepolymer solution is prolonged with the increase of pH value,and shortened with the increase of temperature.The(residual) formaldehyde(exists) in the melamine-formaldehyde polymer when the pH value is low.The microcapsules are perfect sphere and are dispersed well when the pH value of polymerization system is 4~5.Both the enthalpy and thermal(stable) temperature of the microcapsules increase with the rise of pH value;however,the pH value in the range of 4~5 is preferable due to the dispersity and reaction period of the microcapsules.
Keywords:microcapsule  phase change material  n-octadecane  morphology  property  
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