二乙二醇十八烷基醚单甲基丙烯酸酯及其聚合物的制备和表征

摘要

以二乙二醇十八烷基醚和甲基丙烯酰氯为原料,采用醇钠-酰氯法合成了二乙二醇十八烷基醚单甲基丙烯酸酯(DEGOEMA),并利用自由基聚合得到聚(二乙二醇十八烷基醚单甲基丙烯酸酯)(PDEGOEMA)。采用凝胶渗透色谱( GPC )分析测试了 PDEGOEMA 的分子量和分子量分布。通过傅里叶变换红外光谱(FTIR)、核磁共振氢谱(1H NMR)、差示扫描量热(DSC)、热重(TG)和X射线衍射(XRD)对DEGOEMA和PDEGOEMA的结构、相变行为、热稳定性和晶体结构进行了研究。结果表明,这种新型单体及其聚合物是一种具有稳定的结构、良好的结晶性能、高相变焓及良好热稳定性的相变材料。 PDEGOEMA的起始吸热温度为41℃,起始放热温度为36℃,热焓为73 J/g,在314℃以下热稳定性良好,可用于加工或使用温度较高的环境。%Diethylene glycol octadecyl ether methacrylate ( DEGOEMA ) as a phase change material was prepared by means of acrylation of diethylene glycol octadecyl ether sodium ( C18 E2 Na ) with methacryloyl chloride. And then poly( diethylene glycol octadecyl ether methacrylate) ( PDEGOEMA) was synthesized by free radical polymerization. The molecular weight and its distribution were characterized using gel permeation chromatography( GPC) . The structure, phase change properties, thermal stablility, crystal structure of the monomer and the comb-like polymer were characterized using Fourier transform infrared spectroscopy( FTIR) , hydrogen nuclear magnetic resonance spectrum(1H NMR), differential scanning calorimetry(DSC), thermo-gravimetric analysis( TG) and wide-angle X-ray diffraction( XRD) . The results show that the novel monomer and polymers are excellent phase change materials with steady structure, high crystallinity, higher heat enthal-py and thermal stablility. Both the melting and crystallizing enthalpies of PDEGOEMA are 73 J/g. The onset melting temperature and crystallizing temperature are 41 and 36 ℃, respectively. It is thermal stable below 314 ℃. These properties indicate that this phase change material can be widely used as a polymeric phase change material in high processing and using temperature environments.