摘要
文中采用溶液法制备了以聚乙二醇(PEG)为基体、聚乳酸(PLA)和碳纳米管(CNTs)为支撑结构的相变复合材料。通过微观结构发现,CNTs在PEG相变复合材料中呈类“隔离”结构分布,显著降低了PEG相变复合材料的导电逾渗阈值,从0.46%(PLA/CNTs)降低至0.13%(PEG/PLA/CNTs);且PEG/PLA/CNTs相变复合材料在100次的热力学循环测试中能够保持良好的热循环稳定性和化学结构,在160℃的高温环境中能够保持良好的形状稳定性,未出现PEG泄露和塌陷现象。在温敏响应行为研究中发现,PEG/PLA/CNTs相变复合材料实现了PTC效应到NTC效应的转变;随着测试温度的提高,相变复合材料的能量储能平台逐渐变宽,最高可达37.2 min。在光-电-热效应测试中发现,PEG/PLA/CNTs复合材料在不同的光照强度下均能体现出储能效果和光电转换效率(η),在150 mW/cm^(2)光照强度下复合材料的η值达到了42.9%,且随着光照强度的增加,复合材料的η值随之上升。
Phase change composites with PEG as matrix and PLA and CNTs as support structures were prepared by solution method.The microstructure shows that CNTs are distributed in a similar"isolated"structure in PEG phase-change composites,and the threshold of conductive percolation of PEG phase-change composites is significantly reduced from 0.46%(PLA/CNTs)to 0.13%(PEG/PLA/CNTs).In addition,the PEG/PLA/CNTs phase change composite can maintain good thermal cycle stability and chemical structure in 100 thermodynamic cycle tests,and can maintain good shape stability at 160℃,without PEG leakage and collapse phenomenon.The thermosensitive response behavior of the PEG/PLA/CNTs composites shows that the transition from PTC effect to NTC effect is realized.With the increase of test temperature,the energy storage platform of PCM gradually becomes wider,up to 37.2 min.In the test of photo-electric-thermal effect,it is found that the PEG/PLA/CNTs composites show energy storage effect and photoelectric conversion efficiency(η)at different light intensities.ηof the composites reaches 42.9%at a light intensity of 150 mW/cm^(2),andηof the composites increases with the increase of light intensity.
作者
赵中国
王筹萱
王开源
薛嵘
苏巨桥
刘欣月
申思扬
杨其
Zhongguo Zhao;ChouxuanWang;KaiyuanWang;Rong Xue;Juqiao Su;Xinyue Liu;Siyang Shen;Qi Yang(National and Local Engineering Laboratory for Slag Comprehensive Utilization and Environment Technology,School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723000,China;Guizhou Tyre Co.,Ltd.,Guiyang 550000,China;State Key Laboratory of Polymer Materials Engineering,College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2024年第7期123-135,共13页
Polymer Materials Science & Engineering
基金
陕西省教育厅项目(23JK0373)
陕西理工大学博士启动人才项目(SLGRCQD2329)。
关键词
相变复合材料
导电性能
光电效应
温敏响应
phase change composites
electrical conductivity
photoelectric effect
temperature-sensitive response
