通过原位聚合法合成了以石蜡为芯材，密胺树脂为壁材，壁材掺杂碳纳米管(CNTs)的相变材料微胶囊.采用差示扫描量热仪(DSC )、热重分析仪(TG)、扫描电子显微镜(SEM)和傅里叶红外光谱(FT-IR)等分别对微胶囊的储热性能、热稳定性能、表面形貌和分子结构进行了表征.通过分散性实验证明了改性后的碳纳米管分散性明显提高，讨论了不同CNTs加入量对微胶囊表面形貌和热性能的影响.结果表明，加入CNTs 后，微胶囊的表面变得相对光滑；随着CNTs 添加量的增加，微胶囊的包裹率从60．60％增大到了72．35％，微胶囊的导热系数从0．255 W/(m?K)增大到0．356 W/(m?K)，同时微胶囊的稳定性也明显提高.
The phase-change microcapsules with paraffin as core and carbon nanotubes (CNTs)-doped melamine-formaldehyde (MF)resin as shell were synthesized through in situ polymerization.The heat storage capacity, thermal stability,surface morphology and molecular structure of the synthesized microcapsules were investiga-ted by differential scanning calorimetry (DSC),thermal gravimetric (TG)analysis,scanning electron microsco-py (SEM)and Fourier transform infrared spectroscopy (FT-IR)respectively.The dispersion experiment proved that the dispersion of the modified CNTs was improved greatly as designed,and the influences of the amount of CNTs on the surface morphology and thermal property of microcapsules were discussed.The results show that compared to that of microcapsule,the CNTs-doped microcapsule exhibits smoother surface and its stability was also improved.Moreover,the package rate and thermal conductivity of microcapsules increased from 60.0% to 72.4% and 0.255 to 0.356 W/(m??K)with increasing the addition of CNTs,respectively.
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