论文部分内容阅读
以正十八烷为芯材,采用悬浮聚合法制备了以聚甲基丙烯酸十八烷基酯,以及甲基丙烯酸十八烷基酯(SMA)-甲基丙烯酸共聚物(MAA)为囊壁的相变微囊(Micro PCMs)。采用扫描电子显微镜、差示扫描量热分析、热重分析等方法分析了Micro PCMs的表面形貌、储热性能以及热稳定性。结果表明,SMA的长烷基侧链可使囊壁凭借一定的弹性形变抵御外力作用。引入MAA后的Micro PCMs储热密度更高,其相变焓达136.0 J/g。SMA的半结晶性能使Micro PCMs具有优异的耐热性能,其起始失重温度比正十八烷提高了60℃。
Using octadecane as core material, poly (octadecylmethacrylate) and octadecyl methacrylate (MAA) -methacrylic acid copolymer (MAA) were prepared by suspension polymerization. Phase change microcapsules (Micro PCMs). The surface morphology, heat storage performance and thermal stability of Micro PCMs were analyzed by scanning electron microscopy, differential scanning calorimetry and thermal gravimetric analysis. The results show that SMA long alkyl side chain can make the wall with a certain degree of elastic deformation to resist external forces. Micro PCMs after MAA introduction heat storage density is higher, the phase transition enthalpy reached 136.0 J / g. The semicrystalline properties of SMA make Micro PCMs have excellent heat resistance, and the initial weight loss temperature is 60 ℃ higher than n-octadecane.