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Citation: 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): 942-945. shu

Effects of pH on Synthesis and Properties of Microencapsulated n-Octadecane

1.
Institute of Functional Fibers, Tianjin Polytechnic University, Tianjin 300160

Corresponding author: WANG Xue-Chen,
Received Date: 6 November 2004
Available Online: 18 March 2005
Fund Project: 国家自然科学基金资助项目(50073015) (50073015)天津市科技攻关计划资助项目(033101811) (033101811)

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.
- microcapsule,
- phase change material,
- n-octadecane
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