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Preparation and the Modification of Organic and Inorganic Composite CMC-MF Micro/Nano-Encapsulated Phase Change Materials

Author: HuXiaoFeng
Tutor: HuangZhanHua
School: Northeast Forestry University
Course:
Keywords: Carboxymethyl cellulose Melamine resin Sphere Phase change nanocapsules Inorganic particles
CLC: TB34
Type: Master's thesis
Year: 2013
Downloads: 81
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Abstract


The aim of the present work was to fabricate novel nanoPCMs containing paraffin by in situ polymerization using CMC-modified MF as the shell material. And nano-TiO2and nano-SiO2were grafted to the shell material of EPCMs respectively and research the influence of nano-inorganic particles on the morphology and thermal properties of EPCMs. EPCMs with paraffin core and CMC modified MF resin shell were using in situ polymerization. The effect of CMC, core/shell ratio, emulsifier style, emulsification rate, prepolymer viscosity and pH on the surface morphology, size distribution and thermal properties of EPCMs were studied. The structure of CMC-modified EPCMs has obvious changes. The capsule is more compact and the toughness of capsules has improved. When the emulsifier is the mixture of anionic emulsifier and nonionic emulsifier, the emulsifier rate is8000r/min, the prepolymer viscosity is about0.576mPa-s, curing pH is3.2and the mass ratio of paraffin to CMC and prepolymer is1:1, the phase change latent heat and PCM content reach to the maximum value of83.46J/g and63.1%, respectively. Irregular spherical EPCMs with mean diameter of50nm are obtained.Composite microspheres were successfully prepared by grafting nano-TiO2and nano-SiO2particles to EPCMs via chemical reaction method. The effects of preparation process on the surface morphology and the thermal properties of composite microspheres were investigated. The results indicate that the optimized method is immediate adding the inorganic particles dispersion when all the CMC and prepolymer was added to the reaction system, the additive amount of inorganic particles is5%and the curing pH of TiO2and SiO2composite microspheres are3.5and3.0. The optimum phase change latent heat is86.69J/g and80.01J/g, respectively.

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