氧化石墨烯改性石蜡相变微胶囊的制备与传热性能研究

Preparation of graphene oxide modified paraffin-based microencapsulated phase change material and study on its heat transfer performance

为增强相变微胶囊传热性能,采用原位聚合法制备了以石蜡为芯材、密胺树脂为壁材、氧化石墨烯(GO)为强化传热介质的相变微胶囊。对微胶囊的结构、形貌及热性能进行表征,结果表明,改性相变微胶囊结构稳定、形貌规则均一、热稳定性良好;GO的添加使得包覆率最高达到84.1%;随着GO添加量的增加,微胶囊的蓄、放热时间逐渐缩短,相较于未添加GO的微胶囊,蓄、放热时间最高缩短了约10.7%。

In order to enhance the heat transfer performance of microencapsulated phase-change material(MEPCM),a kind of MEPCM is prepared by in-situ polymerization method using paraffin as core material,melamine formaldehyde resin as shell and graphene oxide(GO)as the heat transfer enhancement medium.The structure,morphology and thermal properties of the modified MEPCM are characterized by SEM,FTIR,DSC,TGA and heat storage experiments.It is found that the modified MEPCM owns a stable structure,an excellent thermal stability,and regular and uniform morphology.With the addition of GO,the highest coating rate of the modified MEPCM can reach 84.1%.With the increasing addition amount of GO,the time that the modified MEPCM spends in heat storage and heat release shortens gradually,which is about 10.7%shorter than that of the MEPCM without GO.