摘要
采用原位聚合法制备了以石蜡为芯材、三聚氰胺-甲醛-尿素树脂为壁材、复合纳米铝及羧基化短多壁碳纳米管(CNT)的改性相变微胶囊,测试了无添加剂、只复合纳米铝以及同时复合纳米铝和CNT的相变微胶囊的外观、粒径、过冷度、导热系数以及悬浮液物理稳定性。结果表明,改性微胶囊外观圆润,粒径有所增大,悬浮液48 h不分层;同时复合两种物质使过冷度从12. 7℃降低到5. 3℃,仅比芯材本身过冷度高0. 9℃,基本消除了低温放热峰,使热量几乎全在高温放热峰快速释放,其导热系数提高到0. 87 W/mK,提高了295. 45%。
The modified microencapsulated phase change materials(MPCM)were synthesized by in situ polymerization using paraffin as core and urea-melamine-formaldehyde polymer as shell and composite nano aluminum and carboxylated short multi-walled carbon nanotubes(CNT);The morphology,diameter distributions,degrees of supercooling,thermal conductivities and stability of the MPCMs(without additives,with nano aluminum,with nano aluminum and CNT)were measured.The modified MPCMs all show spherical shape and larger sizes and the suspensions are not stratified for 48 h.MPCM with two copositions reduces the degree of supercooling from 12.7℃to 5.3℃,only 0.9℃higher than bulk paraffin.It basically eliminates the exothermic peak of low temperature and makes the heat energy release almost all at high temperature exothermic peak and the thermal conductivity increases 295.45%to 0.87 W/mK.
作者
周宇飞
仇中柱
乐平
李芃
姜未汀
姚远
张涛
李春莹
ZHOU Yu-fei;QIU Zhong-zhu;LE Ping;LI Peng;JIANG Wei-ting;YAO Yuan;ZHANG Tao;LI Chun-ying(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Shanghai Hongqiao Business District Energy Service Co.,Ltd.,Shanghai 201107,China;College of Energy and Mechanical Engineering,Tongji University,Shanghai 200092,China;Beijing Normal University,Zhuhai 519085,China)
出处
《应用化工》
CAS
CSCD
北大核心
2018年第10期2154-2157,2161,共5页
Applied Chemical Industry
基金
欧盟委员会第七框架协议玛丽居里国际人才引进项目(FP7-PEOPLE-2011-IIF-298093)
上海自然科学基金(17ZR1411300)
上海市科委重点科技攻关项目(17DZ1201500)
关键词
微胶囊相变材料(MPCM)
过冷
导热系数
物理稳定性
microencapsulated phase change material(MPCM)
supercooling
thermal conductivity
physical stability
