Effect of Different HLB Shell of Phase Change Microencapsule on Effect of Different HLB Shell of Phase Change Microencapsule on Effect of Different HLB Shell of Phase Change Microencapsule on Thermal Properties
| Autor: | Ming-Zhe Lee, 李銘哲 |
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| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 Phase change microcapsules (MicroPCMs) containing n-octadecane as the microcapsule core, were prepared through a suspension polymerization method, using MMA (methyl methacrylate) monomer acting as the basic monomer, and the glycolyl-based di(meth)acrylate having various of HLB value as acting the co-monomer for cross-link formation to construct the shell of the microcapsule. The influence of the shell/core mass ratio and HLB value of cross-linking agents on the properties and encapsulation performance of MicroPCMs have been studied. In the study, identification of shell/core structure, surface morphology and thermal properties of MicroPCMs were investigated by fourier transform infrared spectroscopy (FT-IR), environmental scanning electron microscope (ESEM), thermogravimetric analysis (TGA), and differential scanning calorimeter (DSC). And, the thermal cycling test was used to explore the retention of thermal properties of the MicroPCMs. The experimental results showed that particle size distribution of MicroPCMs is broad when using the conventional suspension polymerization. Adding the cross-linking agent can help the formation of MicroPCMs. The MicroPCMs prepared by using lower shell/core mass ratio and HLB value cross-linking agent can get higher efficiency of encapsulation. However, addition of higher HLB value cross-linking agent is inferior for preparing the MicroPCMs by suspension method. At the same time, thermal cycling test showed there’s no significant latent heat difference between the 1st and 100th run. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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