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摘要：以固体石蜡为芯材，聚甲基丙烯酸甲酯（PMMA）为壁材，采用乳液聚合法制备了相变材料微胶囊。分别采用生物显微镜、傅立叶变换红外光谱仪（FT-IR）、热重分析仪（TGA）对微胶囊的形貌、结构、性能进行了分析。研究了体系浓度、乳化剂种类及浓度、引发剂种类及浓度和交联剂的量对石蜡/PMMA微胶囊包埋率、粒径大小及均匀程度的影响。结果表明：在一定范围内，搅拌速率越高、体系浓度越低，得到的微胶囊颗粒越均匀、粒径越小。乳化剂质量在达到油相质量5%、引发剂用量在达到壁材单体质量4%、交联剂的量为1g的时候得到的微胶囊的包埋率最高，达到60.12%。对比BPO和AIBN两种引发剂，AIBN引发剂制备的石蜡/PMMA微胶囊颗粒比较均匀，粒径较小，平均粒径为1~2μm。24497
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毕业论文关键词：聚甲基丙烯酸甲酯；微胶囊；相变材料；乳液聚合法
Preparation and characterization of cross-linked PMMA shell paraffin microcapsule
Abstract: Using liquid paraffin as the core material, Polymethylmethacrylate as shell material, was prepared phase change materials microcapsules by emulsion polymerization method . Using biological microscope, Fourier transform infrared spectroscopy(FT-IR), thermogravimetric(TGA) to analysis microcapsule morphology, structure, performance. also study the effects from system concentration, types and concentration of emulsifier, types and concentration of initiator of the experiment on the paraffin / polymethylmethacrylate microcapsule rate, particle size and uniformity of impact. The results show that: within a certain range, the microcapsules what had the finer and more uniform particles were obtained by higher stirring rate and the lower the concentration system. With emulsifier mass 5% of the oil phase, the initiator mass 4% of the wall material monomer, the microcapsules obtained the highest rate, achieve to 60.12%. Contrasting BPO with AIBN as initiators, with AIBN as initiator achieved relatively uniform and small particles which average size were 1~2μm.
Key Words: Polymethylmethacrylate；Microcapsule；Phase change materials； Emulsion polymerization method
目录
1绪论 3
1.1相变材料微胶囊的发展 3
1.2 微胶囊技术的概念 4
1.3 相变材料的概念 4
1.4 微胶囊壁材的分类 5
1.5相变材料微胶囊的制备方法 6
1.5.1 原位聚合法 6
1.5.2 界面聚合法 6
1.5.3 喷雾干燥法 6
1.5.4复凝聚法 7
1.5.5其他制备方法 7
1.6相变材料微胶囊制备方法的选择 7
1.7微胶囊制备过程中的主要影响因素 8
1.7.1 引发剂种类对聚合反应的影响 8
1.7.2 乳化剂种类及用量对微胶囊的影响 8
1.7.3 芯壁比对微胶囊包埋率的影响 8
1.8 本课题研究的意义 9
2 实验 11
2.1 实验原料与仪器 11
2.1.1 实验原料 11
2.1.2 实验仪器 11
2.2 实验原理 12
有机相变储能微胶囊的制备 12
2.2.1 甲基丙烯酸甲酯聚合反应原理 13
2.3 实验方法 14
2.3.1 MMA的精提纯 14
2.3.2 BPO的重结晶 15
2.3.3 AIBN的纯化 15
2.3.4 相变材料微胶囊的制备过程 15
2.4 研究内容 16
2.4.1 石蜡/PMMA相变微胶囊的制备 16
2.4.2不同乳化剂对乳化体系稳定性的影响 16