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Citation: ZHENG Li-Hui, FANG Mei-Hua, CHENG Si-Qing, SONG Guang-Sen. Preparation and Thermal Properties of Microencapsulated Paraffin[J]. Chinese Journal of Applied Chemistry, ;2004, 21(2): 200-202. shu

Preparation and Thermal Properties of Microencapsulated Paraffin

1.
Department of Biotechnology and Chemical Engineering, Wuhan Polytechnic University, Wuhan 430023

Corresponding author: ZHENG Li-Hui,
Received Date: 14 April 2003
Available Online: 9 November 2003
Fund Project: 湖北省自然科学基金资助项目(2002AB063) (2002AB063)

Paraffin microcapsules with urea-formaldehyde polymer skin are prepared by in-situ polymerization of urea-formaldehyde prepolymer. It is found that the pH value of the aqueous solution, addition of NaCl and temperature affect the developing rate of microcapsules, and the most important appears pH value. The thermal properties of the microcapsules are explored by differential scanning calorimetry. The optimum conditions are:pH value 1.5, temperature 333.15~363.15 K, mass fraction of NaCl about 10%. The thermal analysis results show that the endothermic ability between 296.26 K and 308.15 K amounts to 9.11 J/g when the microcapsules undergo solid-liquid phase change at 300.53 K, the mean fusion heat of the microcapsule is 1.20 J/(g·K).
- paraffin,
- microcapsule,
- in-situ polymerization,
- phase change material,
- thermal property,
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