通过原位聚合法制备了氧化石墨烯(GO)改性的密胺树脂(MF)/石蜡相变微胶囊.采用红外光谱、扫描电镜、差示扫描量热分析、热重分析等手段分析了相变微胶囊的微观结构及热性能,研究了GO含量对相变微胶囊形貌、包覆率和渗漏率的影响.研究结果表明,制备的相变微胶囊为较规则的球形,GO的加入并没有改变壁材或芯材的化学结构;GO改性使相变微胶囊的包覆率由91.39％提高至94.08％,增大了相变微胶囊的储能能力;GO改性相变微胶囊的防渗性能得到大幅提升,250h时的渗漏率由9.43％下降至2.68％,下降了71.6％,相变微胶囊的使用寿命得到提高.
The graphene oxide (GO) modified microencapsulated phase change materials (MEPCMs) with melamineformaldehyde resin (MF) as wall and paraffin as core were prepared by in situ polymerization.The microstructure and thermal property of MEPCMs were analyzed by FT-IR,SEM,DSC and TG.The effects of GO addition on the encapsulation rate and the leakage rate were investigated.The results show that the prepared MEPCMs have a regular spherical shape and the addition of GO does not change the chemical structure of MF and paraffin.The modification of GO improves the encapsulation rate of MEPCMs from 91.39％ to 94.08％,and the energy storage capacity of MEPCMs is increased.The leakage-prevention performance of the modified MEPCMs is greatly improved,and the leakage rate is decreased by 71.6％,which decreases from 9.43％ to 2.68％ in 250 h.The service life of MEPCMs is improved.
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