首先使用缩合剂方法制备十六胺修饰的烷基化碳纳米管(i-CNTs),然后将i-CNTs加入到芯材正十四醇(TD)中,通过原位聚合法制备了掺杂碳纳米管的正十四醇相变微胶囊,研究了i-CNTs添加量对微胶囊热性能的影响。采用红外光谱仪和热重分析仪对i-CNTs和微胶囊的化学结构及热稳定性进行了表征,采用扫描电子显微镜、差示扫描量热仪和多路温度巡检仪等测试仪器对相变微胶囊的表面形貌及储热、调温性能进行了表征和分析。结果表明,十六胺成功接枝到了羧基化多壁碳纳米管上,改性后得到的i-CNTs亲油疏水性加强;所制得的微胶囊呈球形,壁厚约985nm;i-CNTs添加量为20mg时,相变微胶囊的熔融峰温和熔融热焓分别为39.4℃和159.1J/g;i-CNTs的掺杂提高了相变微胶囊的热稳定性,同时改善了其调温性能。
Firstly,carbon nanotubes grafted with hexadecylamine(i-CNTs) was prepared with the aid of the condensation agent dicyclohexylcarbodiimide (DCC),and then added into n-tetradecanol(TD).A novel type of CNTs modified microencapsulated phase change materials (MPCM) using the mixture of i-CNTs and TD as the core material was fabricated via in-situ polymerization.The effect of the amount of i-CNTs on the thermal performance of the microcapsules was studied.The chemical structure and thermal stability of modified CNTs and microcapsules were characterized by FT-IR spectrometry and thermogravimetric analysis (TG),respectively.The surface morphology,heat storage capacity and temperature regulation performance of the as-prepared MPCM were determined by scanning electron microscope (SEM),differential scanning calorimeter (DSC) and multi-channel temperature inspection instrument,respectively.The results indicated that the hexadecylamine was successfully grafted onto CNTs,and the modified CNTs had good hydrophobic property.The as-prepared MPCM had regular spherical shape with shell thickness of about 985nm.When the addition amount of i-CNTs was 20mg,the melting temperature and melting enthalpy of the MPCM were measured as 39.4℃ and 159.1J/g,respectively.The thermal stability and temperature control performance of the MPCM were improved after the incorporation of i-CNTs.
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基金资助
江汉大学材料科学与工程重点学科课题(03100023)
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