以懸浮聚合法製備相轉移微膠囊;Preparation of microencapsulated phase change materials by suspension polymerization

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Title:	以懸浮聚合法製備相轉移微膠囊;Preparation of microencapsulated phase change materials by suspension polymerization
Authors:	董長璁;Tsung,Chang
Contributors:	化學工程與材料工程研究所
Keywords:	微膠囊;相轉移材料;正十八烷;懸浮聚合法;suspension polyme;n-octadecane;encapsulation;PCM
Date:	2012-06-21
Issue Date:	2012-09-11 18:11:01 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究利用懸浮聚合法以單一單體搭配交聯劑或兩單體搭配交聯劑為殼物質製備相轉移微膠囊，核物質選用有機類相轉移材料正十八烷，殼物質共使用四種單體為苯乙烯(St)、甲基丙烯酸甲酯(MMA)、甲基丙烯酸丁酯(BMA)以及苯甲基丙烯酸酯(BzMA)，將上述四單體分別搭配交聯劑或兩種單體混合搭配交聯劑製備相轉移微膠囊，合成出之微膠囊再以低溫微差掃描熱分析儀(DSC)與掃描式電子顯微鏡(SEM)針對單一單體搭配交聯劑或兩單體搭配交聯劑所製備之微膠囊的潛熱值、產率、包覆效率以及外觀做探討。　　本實驗先將單體、起始劑(AIBN)、交聯劑(EGDMA)與正十八烷混合均勻後倒入含有PVA穩定劑(BP-24)的去離子水溶液中，經由乳化均質機攪拌分散後再行聚合反應。結果顯示，使用單一單體製備微膠囊時，最佳製備條件為使用St為單體且相轉移材料用量為60wt%、起始劑濃度為1wt%並添加甲苯做為溶劑，在該條件下可製備出潛熱值為169.1 J/g，包覆效率133.4×102 J/g‧%之相轉移微膠囊；而在兩單體製備微膠囊時，其最佳製備條件為使用St與BzMA各佔50wt%之單體組成且相轉移材料用量60wt%、起始劑濃度為1wt%並添加甲苯做為溶劑，而在該條件下可成功製備出潛熱值163.0 J/g，包覆效率133.2×102 J/g‧%之相轉移微膠囊。In this study, the n-octadecane phase change materials microcapsules (microPCMs) were prepared by suspension polymerization by using one monomer or two monomers plus crosslinking agent as shell materials. Styrene(St), Methyl methacrylate(MMA), Butyl methacrylate(BMA), Benzyl methacrylate (BzMA) were used as monomers, respectively. Azobisisobutyronitrile(AIBN), Ethylene Glycol Dimethacrylate(EGDMA) and polyvinyl alcohol were used as initiator, crosslinking agent and stabilizer, respectively. The thermal properties and surface morphology of microcapsules were measured by differential scanning calorimetry (DSC), scanning electron microscope (SEM), thermo gravimetric analysis (TGA). 　　In the first experimental part, the monomers, AIBN, and EGDMA were mixed with n-octadecane, then poured into the deionized aqueous solution containing PVA stabilizer (BP-24). The suspension polymerization was occurred after the above solution homogenized by the emulsion homogenizer. The results showed that under optimal reaction conditions, the latent heat and encapsulation efficiency of microPCM prepared by using one monomer plus EGDMA as shell materials were 169.1 J/g and 133.4 ×102 J/g‧% . 　　In the second experimental part, two monomers plus EGDMA were used as shell material, the results showed that under optimal reaction conditions, the latent heat and encapsulation efficiency of microPCM were 163.0 J/g and 133.2 ×102 J/g‧% .
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