丙烯酸聚乙二醇酯相变大单体的制备

摘要

The polyethylene glycol acrylate(PEGA) as phase change material was synthesized via esterification with polyethylene glycol(PEG) 4000 and acryloyl chloride as raw material. The structure and properties of the PEGA were studied by means of infrared spectroscope (IR), polarized light microscope (PLM), differential scanning calorimetry (DSC) and thermogravimetry(TG). The optimum synthesis process of the PEGA was determined by orthogonal experiment. The characteristic absorption peaks of ester bond and ethylenic bond appear in the IR spectra of the PEGA. The PLM images indicate that there is obvious extinction cross section in the PEGA crystal but the crystal radius significantly decreases compared to pure PEG4000. The phase transition temperature of the PEGA is 46.53 X, and the crystallization enthalpy is 163.21 J/g according to the DSC analysis. The TG results demonstrate that the PEGA degrades at 230 t, showing its good heat resistance. A novel crosslinking network solid-solid phase change material can be prepared through curing of the PEGA.%以聚乙二醇(PEG)4000及丙烯酰氯为原料,采用酯化法合成了丙烯酸聚乙二醇酯(PEGA)相变大单体.利用红外光谱(IR)、偏光显微镜( PLM)、差示扫描量热(DSC)、热重(TG)分析等研究了PEGA相变大单体的结构与性能,通过正交实验获得PEGA的最佳合成工艺.IR显示PEGA中出现酯键及C=C的特征峰;PLM显示PEGA晶体仍有明显的结晶消光截面,但相对纯PEG4000而言,其晶体半径明显减小；DSC分析表明PEGA在46.53℃出现结晶峰,结晶焓为163.21 J/g;TG分析表明PEGA在230℃开始降解,耐热性较好.PEGA交联固化后可制得新型交联网络型固-固相变材料.