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化工学报  2015 

聚苯乙烯-二氧化硅@十四烷复合纳米相变胶囊的表征及其乳液性能

DOI: 10.11949/j.issn.0438-1157.20141287, PP. 800-805

Keywords: 复合相变胶囊,纳米粒子,高导热性二氧化硅,热传导,蓄冷流体,乳液

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Abstract:

采用细乳液原位聚合法,研制了以正十四烷(Tet)为芯材、高热导率二氧化硅(SiO2)改性的聚苯乙烯(PS)为壳层的新型复合纳米相变胶囊蓄冷材料;对复合胶囊形貌、组成以及热物性进行纳米粒度、透射电镜(TEM)、X射线光电子能谱(XPS)、差示扫描量热(DSC)以及热失重(TG)等表征,并测试其乳液的热导率、比热容、黏度及机械稳定性。结果显示:复合相变胶囊平均粒径为64.90nm,具有规整的球形核壳结构,表面硅含量(质量分数)为3.27%,相变潜热达83.38J·g-1,复合壳材对芯材有很好的保护作用;其乳液的热导率及比热容峰值均优于未用SiO2改性的纳米胶囊乳液,且乳液具有较高机械稳定性和较低黏度,可作为潜在的蓄冷用功能热流体。

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