杂化壳相变微胶囊的制备与热性能研究

PREPARATION AND THERMAL PROPERTIES OF HYBRID SHELL PHASE CHANGE MICROCAPSULES

采用原位聚合法以石蜡为储热芯材、二氧化钛和壳聚糖的杂化壳体为壁材、石墨烯微片(GNP)作导热填料制备一种结构稳定的防泄漏相变微胶囊。采用电镜扫描(SEM)、傅里叶红外光谱(FTIR)、热重分析法(TGA)、差示扫描量热法(DSC)和导热系数测试仪研究不同芯壳比、GNP填充量对微胶囊的微观结构、表面官能团、热稳定性、相变性能和导热性能的影响。结果表明:制得微胶囊的结构致密防泄漏性能良好,微胶囊相变潜热最高达到134.78 J/g,对应包覆率为75.51%,GNP的加入使微胶囊的导热系数提高261.5%。

In-situ polymerization was adopted to prepare a structure-stable and leakproof phase change microcapsule,which was composed of paraffin as heat storage core material,titanium dioxide and chitosan as shell and graphene nanoplatelets(GNP)as thermal conductive filler.SEM、FTIR、TGA、DSC and thermal conductivity tester were used to investigate the effect of different core-shell ratio and GNP filling amount on the microstructure,surface functional groups,thermal stability,phase transformation and thermal conductivity of microcapsules.The results indicated that microcapsules have a compact structure and good leakage resistance.The maximum phase change latent heat of the microcapsules is 134.78 J/g,and the corresponding coating rate is 75.51%.The thermal conductivity of microcapsules increased by 261.5%due to the introduce of GNP.