摘要
蠕变行为对于材料的服役应用至关重要.蠕变分析测试可以揭示高分子材料的黏弹性本质,解析高分子材料长时间尺度下的力学松弛行为.本研究以聚丙烯酸(PAA)和聚环氧乙烷(PEO)构筑氢键复合物,并利用共价交联和金属离子配位作用增强氢键网络,研究温度和湿度这两种最主要的环境参数对复合物蠕变行为的影响.分别通过时间-湿度叠加和时间-温度叠加构建蠕变柔量主曲线,进一步结合湿度和温度对时间的叠加,构建了更长时间尺度的主曲线,解析了长时间尺度下的力学松弛行为,指导材料实际服役和应用.
Creep behavior is critical for the service applications of materials.Creep analysis tests can effectively reflect the viscoelastic properties of polymer materials and evaluate the mechanical relaxation behavior of polymer complexes over long time scales.In this work,polyacrylic acid(PAA)and polyethylene oxide(PEO)were used to construct hydrogen-bonded polymer complexes,and covalent cross-linking and metal ion coordination were used to strengthen the hydrogen bond network.The influence of temperature and humidity,the two main environmental parameters,on the creep behavior of these complexes were investigated.With the increase in temperature or humidity,the creep deformation of the three types of films also increases.The creep compliance master curve was constructed by time-humidity superposition and time-temperature superposition respectively.The temperature shift factor(aT)conforms to the Williams-Landel-Ferry(WLF)equation.The humidity shift factor(aw)is shown as a piecewise linear dependence of water ratio.The coupling of environmental factors greatly affects the properties of hydrogen-bonded complexes.Further combined with the superposition of humidity and temperature on time,the main curve of a longer time scale was constructed,and the mechanical relaxation behavior under a long time scale was analyzed and expounded,so as to guide its practical service and application.
作者
刘泽新
尹培阳
黄浩
张彩虹
杨曙光
Ze-xin Liu;Pei-yang Yin;Hao Huang;Cai-hong Zhang;Shu-guang Yang(State Key Laboratory of Advanced Fiber Materials,Center for Advanced Low-dimension Materials,College of Material Science and Engineering,Donghua University,Shanghai 201620)
出处
《高分子学报》
北大核心
2025年第7期1223-1233,共11页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号52273020)资助.
关键词
时间-温度叠加
时间-湿度叠加
力学松弛
黏弹性
Time-temperature superposition
Time-humidity superposition
Mechanical relaxation
Viscoelasticity
