以聚乙二醇基交联共聚物(MFPEG)为相变功能单元,采用木质纤维素作为支撑骨架,通过物理吸附将MFPEG与纤维素骨架复合,制备了具有固-固相变行为的新型木质纤维素/聚乙二醇复合相变材料。通过X射线衍射仪、扫描电子显微镜考察了复合相变材料的结构与形貌特征;采用差示扫描量热仪、热重分析仪和热常数分析仪研究了复合材料的相变特性、热稳定性与导热性能;进一步通过模拟控温实验研究了复合相变材料的控温性能。结果表明:MFPEG通过物理作用包覆在木质纤维素支撑骨架中,使得复合相变材料表现出一定的柔韧性;复合相变材料的MFPEG包覆量约为67.78%,升温过程中相变温度和焓值分别为35.15℃和75.25J/g。在18～32℃温区模拟控温实验中,复合相变材料的控温时间比对照组增加了108%,表现出优异的控温性能。
A novel lignocellulose/polyethylene glycol composite phase change material (PCM) with solid-solid phase transition behavior was prepared by compositing polyethylene glycol-based cross-linked copolymer (MFPEG) as the phase change functional unit with a lignocellulosic support skeleton through physical adsorption.The structural and morphological characteristics of the composite PCM were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM).The phase change properties,thermal stability,and thermal conductivity of the composite were studied by differential scanning calorimetry (DSC),thermogravimetric analysis (TGA),and thermal constant analysis.Furthermore,the temperature control performance of the composite PCM was examined through simulated temperature control experiments.The results showed that MFPEG was encapsulated within the lignocellulosic support skeleton through physical interactions,endowing the composite PCM with certain flexibility.The MFPEG loading in the composite PCM was approximately 67.78%,with a phase change temperature of 35.15℃ and an enthalpy value of 75.25J/g during the heating process.In simulated temperature control experiments within the 18～32℃ range,the composite PCM exhibited a 108% increase in temperature regulation duration compared to the control group,demonstrating excellent temperature control performance.
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基金资助
辽宁省教育厅项目(JDL2017035,201802011);国家自然科学基金(51078050,21273025)
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