聚乙二醇@聚乙烯醇同轴相变纤维的储热特性  

Thermal Storage Properties of Poly(ethylene glycol)@Poly(vinyl alcohol)Coaxial Phase Change Fibers

作　　者：徐瑾[1] 陈龙 王金玉 何燕[1] Jin Xu;Long Chen;Jinyu Wang;Yan He(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao 266061,China)

机构地区：[1]青岛科技大学机电工程学院,山东青岛266061

出　　处：《高分子材料科学与工程》2024年第5期134-143,共10页Polymer Materials Science & Engineering

基　　金：山东省泰山学者项目(ts20190937)。

摘　　要：以具有高相变焓的聚乙二醇(PEG 4000)为核层相变材料(PCM)、聚乙烯醇(PVA)为壳层支撑材料、绿色溶剂水为壳层和核层材料溶剂,通过同轴静电纺丝制备出不同核层纺丝液浓度、进液速度的核-壳相变纤维。扫描电镜和透射电镜照片显示,在PEG质量分数为45%、进液速度为0.06 mL/h时,PEG@PVA具有良好的形貌及较高含量的PEG,相变纤维核壳分界面明显。红外光谱分析显示,PEG与PVA化学相容性良好;差示扫描量热分析和热重分析表明,PEG@PVA熔融温度为62.8℃,熔融焓为86.40 J/g,封装效率为42.2%,并且相变纤维膜起始热分解温度较高,在经过500次热循环实验后,熔融焓约损失3.1%,仍能保持绝大部分相变能力;导热测试表明,PEG@PVA膜的热导率介于壳层PVA与核层PEG之间;模拟PEG@PVA膜在工作环境中的温度变化得到温度-时间曲线,结果表明,相变纤维膜可以有效地调节微环境的温度。PEG 4000 with high phase change enthalpy was used as core layer PCM,PVA as shell layer support material,and green solvent water as solvent for the shell and core layer materials,and the core-shell phase change fibers with different core layer spinning solution concentrations and feed rates were prepared by coaxial electrostatic spinning.SEM and TEM photographs show that at a PEG concentration of 45%and an inlet rate of 0.06 mL/h,PEG@PVA has a good morphology and high content of PEG,and the core-shell partitioning interface of the phase change fibers is obvious.FT-IR spectra show that the chemical compatibility between PEG and PVA is good.The results of DSC and TG display that the melting temperature of PEG@PVA is 62.81℃,the melting enthalpy is 86.40 J/g,and the encapsulation efficiency is 42.2%.The thermal onset decomposition temperature of the phase change fibers is high,and the melt enthalpy loss is about 3.1%after 500 thermal cycles of the experiment,which can still maintain most of the phase change ability.Thermal conductivity tests show that the thermal conductivity of the PEG@PVA membrane is between that of the shell layer PVA and core layer PEG.Temperature-time curves were obtained by simulating the temperature changes of the PEG@PVA membrane in working environment,and the results show that the phase change fiber membrane can effectively regulate the temperature of microenvironment.

关 键 词：静电纺丝 同轴纤维 相变材料 储热性能 

分 类 号：TQ340.64[化学工程—化纤工业]