自然老化PVDF膜材单轴力学性能的试验研究

Uniaxial Mechanical Properties of Naturally Aged PVDF Coated Fabrics

选取2组同一型号但处于不同环境下老化的聚偏二氟乙烯(PVDF)膜材,其中1组为修复芜湖体育场时拆下来的膜材,另1组为存放于仓库中的同批次膜材,对2组膜材进行了一系列试验,测定了膜材厚度及膜材的抗拉强度、连接强度和撕裂强度.结果表明:自然环境下老化的膜材,其膜面颜色变为黄灰色且厚度增加,而室内老化的膜材,其表面仍为白色并具有光泽;无论是自然老化还是室内老化的膜材,其抗拉强度、连接强度和撕裂强度都出现了不同程度的降低,并表现出较大的离散性,撕裂强度的变化更为显著.

A series of experiments were carried out to study uniaxial mechanical properties of two groups of the same polyvinylidene fluoride(PVDF)coated fabrics after aging under different environment.The first group was removed from Wuhu stadium when it was repaired and the other one was the same batch of PVDF coated fabrics stored in the warehouse.The items of natural aging experiments included thickness of PVDF coated fabrics,tensile strength,bonding strength and tearing strength.Results show that the color of PVDF coated fabrics after natural aging has changed to yellow-gray and its thickness increases.But the color of PVDF coated fabrics kept indoors is white and shiny.Tensile strength,bonding strength and tearing strength of the two groups of PVDF coated fabrics both show different degrees of reduction and show a greater discreteness.The change of tearing strength is found to be more notable.