防潮复合膜水分子扩散吸附规律及其老化性能研究  

Research on Diffusion and Adsorption Behavior of Water Vapor Molecules of Moisture-proof Composite Plastic Films and Its Aging Properties

作　　者：王小黎[1] 李星华 许文[1] 吴昊昱 高洋洋[2] 张欢[1] WANG Xiaoli;LI Xinghua;XU Wen;WU Haoyu;GAO Yangyang;ZHANG Huan(Aerospace Research Institute of Materials&Processing Technology,Beijing 100076;Beijing Engineering Research Center of Advanced Elastomers,Beijing University of Chemical Technology,Beijing 100029)

机构地区：[1]航天材料及工艺研究所,北京100076 [2]北京化工大学北京市先进弹性体工程技术研究中心,北京100029

出　　处：《宇航材料工艺》2025年第1期68-75,共8页Aerospace Materials & Technology

摘　　要：为了探究多层结构的防潮复合膜对水蒸汽分子的阻隔性能,采用分子动力学模拟方法研究了水蒸汽分子在复合膜中的扩散吸附行为,并且采用并联模型获得了水蒸汽分子在防潮复合膜中的渗透系数(扩散系数与溶解系数之积)。结果显示:水蒸汽分子在复合膜中的扩散系数随着温度的上升而上升,而其溶解系数随着温度的上升而逐渐下降,渗透系数随着温度的上升而上升。同时,多层结构的复合膜中,聚偏氯乙烯(PVDC)的水蒸汽阻隔性效果最佳,其次是聚乙烯(PE),最后是尼龙6(PA6)。另外,为研究复合膜的耐老化性能,采用傅里叶红外光谱、热失重分析和差示扫描量热分析研究了不同老化时间和不同湿度下复合膜的化学结构与热稳定性。结果表明:复合膜具有优异的稳定性,材料性质没有发生明显变化。In order to investigate the barrier properties of multi-layer moisture-proof composite plastic films against water vapor molecules,the diffusion and adsorption behavior of water vapor molecules in the composite films were studied by molecular dynamics simulation.And the permeability coefficient(the product of diffusion coefficient and solubility coefficient)of water vapor molecules in the composite films were obtained by using the parallel model.The results show that the diffusion coefficient of water vapor molecules in the composite films increase with the increase of temperature,while the solubility coefficient gradually decreases with the increase of temperature,and the permeability coefficient gradually increase with the increase of temperature.At the same time,polyvinylidene chloride(PVDC)exhibits the best water vapor barrier performance in the moisture-proof membranes,followed by polyethylene(PE),and finally nylon 6(PA6).Additionally,to study the aging resistance of the composite films,the chemical structure and thermal stability of the composite films under different aging times and relative humidities were studied by Fourier infrared spectroscopy,thermogravimetric analysis and differential scanning calorimetry.The results show that composite films exhibit excellent stability,with no significant changes in material properties.

关 键 词：防潮复合膜 水蒸汽分子 渗透系数 分子模拟 老化 

分 类 号：TB324[一般工业技术—材料科学与工程]