拉伸应力作用下聚氯乙烯涂层膜结构材料的户外老化性能  

Outdoor Weathering Performance of PVC-Coated Membrane Material under Different Tensile Stress

作　　者：王芳娟[1] 杨旭东[1,2,3] 胡淳 

机构地区：[1]东华大学纺织学院,上海201620 [2]东华大学纺织面料技术教育部重点实验室,上海201620 [3]东华大学产业用纺织品教育部工程研究中心,上海201620 [4]上海申达科宝新材料有限公司,上海200122

出　　处：《东华大学学报（自然科学版）》2015年第6期750-755,766,共7页Journal of Donghua University(Natural Science)

基　　金：中央高校基本科研业务费专项基金资助项目(14D110120;14D110129;12D10127)

摘　　要：以聚氯乙烯(PVC)涂层膜结构材料为研究对象,在无应力(0%)以及5%,10%和20%3种载荷水平的应力作用下,对膜结构材料进行了为期7个月的户外老化试验.在老化过程中对膜结构材料的白度、表面形态、拉伸性能进行测试,并对老化后的产物进行了傅里叶变换红外光谱(FTIR)分析.试验结果表明:载荷水平20%的应力作用下老化7个月时,白度值下降19.81%,断裂强力保持率下降10.63%,而断裂伸长率仅下降8.89%,但此应力作用下PVC涂层表面老化4个月就能明显观察到裂纹的出现,即应力作用下试样表面涂层的白度值、表面形态变化都相对较明显,而拉伸性能变化不很明显.FTIR分析结果表明:不同应力作用下试样的光氧老化机理没有发生变化,羰基指数的变化说明应力作用加速了涂层膜结构材料的老化.The experiment used the PVC-coated membrane material as the study object. The outdoor weathering test was performed for seven months under four different tensile stresses （0%, 5%, 10% and 20% of the breaking strength）. The whiteness, surface morphology and tensile properties were tested during the experiments. In addition, Fourier transform infrared spectrometry （FTIR） was used to analyze the degradation products of aging samples. When aging time was up to seven months under 20% of the breaking strength, the whiteness decreased by 19.81%, the tensile strength retention decreased by 10.63% but the tensile elongation retention just decreased by 8.89%. The surface of PVC coating can be clearly observed the crackles only at the time of four months under the same stress. The results showed that the whiteness and surface properties changed significantly under tensile stress, yet the tensile properties did not change significantly.. The results of the FTIR analysis indicated that the photo- oxidation mechanism of PVC-coated membrane material did not change under four different tensile stresses. Eventually, the change of the carbonyl index indicated that the stress accelerated the weathering of PVC coating.

关 键 词：PVC涂层膜结构材料 拉伸应力 户外老化 拉伸性能 羰基指数 

分 类 号：TB332[一般工业技术—材料科学与工程]