交联聚甲基丙烯酸月桂酯/正十八烷相变微胶囊的制备与性能研究

Preparation and property of microencapsulated n-octadecane with crosslinked poly(lauryl methacrylate)as phase change material

采用悬浮聚合法制备以聚甲基丙烯酸月桂酯(PLMA)为囊壁,正十八烷为芯材的相变微胶囊(MicroPCMs),并引入1,4-丁二醇二丙烯酸酯(BDDA)和双季戊四醇五丙烯酸酯(DPHA)对其进行交联改性。采用扫描电子显微镜,差示扫描量热分析,热重分析及冷热循环实验等方法研究了MicroPCMs的表面形貌、储热性能以及热稳定性。结果表明,BDDA交联和DPHA交联的MicroPCMs均具有较高的相变焓,分别为103.9J/g和123.3J/g,耐热温度均比正十八烷提高了50℃;多官能度单体DPHA交联的MicroPCMs表面更光滑致密,储热可靠性更好。

Microencapsulation of n-octadecane as core with crosslinked poly（lauryl methacrylate） as shell was performed by suspension polymerization. 1,4-butylene glycol diacrylate （BDDA） and dipentaerythritol pentaacrylate （DHPA） were employed as crosslinking agents. The surface morphology of microcapsules was determined by scanning electron microscopy （SEM）. The thermal property and thermal stability of microcapsules were investigated by differential scanning calorimetry （DSC） and thermal gravirnetric analysis （TG）. Both microcapsules with BDDA and DHPA exhibited great thermal storage abilities with melting enthalpies of 103.9J/g and 123.3J/g, respectively. The thermal resistant temperature of them increased by over 50℃ compared with that of n-octadecane bulk. The microcapsule with DHPA had a better thermal reliability in comparison with microcapsule with BDDA.