摘要:
以聚乙烯醇(PVA)纺丝原液为分散介质, 常温相变材料RT27石蜡为芯材, 正硅酸乙酯(TEOS)为聚合单体形成SiO2囊壳, 通过原位聚合直接制备含有石蜡微胶囊的PVA纺丝原液, 之后通过湿法纺丝制备石蜡/PVA储能纤维。通过正交实验优化, 结合粒径分布软件, 分析各因素对微胶囊粒径的影响, 选择适合纺丝的微胶囊合成条件。采用FTIR-ATR、SEM、EDS及TEM表征了纤维及微胶囊的化学成分及形态, 通过DSC、TGA表征了微胶囊的包覆率、纤维的储能性及热稳定性。结果表明: PVA纺丝原液中合成了SiO2凝胶包裹的相变微胶囊, 其平均粒径为1.39 μm, 大小及分布适合纺丝。纤维相变焓值为45.39 J/g, 石蜡包裹率高达94.72%, 纺出纤维具有较高的储能性和较好的热稳定性。
关键词:
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聚乙烯醇
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纺丝原液
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原位聚合
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石蜡
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微胶囊
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储能
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纤维
Abstract:
icrocapsules containing paraffin as core and SiO2 as shell were synthesized in-situ in polyvinyl alcohol (PVA) spinning solution. Thus energy storage paraffin/PVA fibre was prepared via wet-spinning process. To get the optimum conditions for the synthesis of microcapsules, the orthogonal experimental design was used together with the particle size analysis software to analyze relevant factors of particle size. Chemical structures and morphologies of the microcapsules and the fibres were characterized by FTIR-ATR, SEM, EDS and TEM. DSC and TGA were adopted to determine the coated rate of microcapsules, the latent heat storage and thermal stability of the fibre. The results indicate that energy storage microcapsules are successfully synthesized in PVA spinning solution with a paraffin encapsulated ratio as high as 94.72%, and the average particle size of 1.39 μm is suitable for wet-spinning. The paraffin/PVA fibre shows a relatively good thermal stability with a high latent heat of 45.39 J/g.
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