紫外辐照下透明聚氨酯胶片老化机理
Degradation Mechanisms of Transparent Polyurethane Interlayer under UV Irradiation
查看参考文献16篇
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文摘
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针对高端夹层玻璃的老化问题,选用荧光紫外灯,对其主要粘结材料-透明聚氨酯胶片分别进行0/200/ 300/500 h的照射,借助紫外/可见光分光光度计、傅里叶红外光谱仪、扫描电镜等设备,研究照射过程中材料颜色、结构、微观形貌的变化。扫描电镜显示照射时间延长到500 h,材料表面出现龟裂。实验发现胶片的老化起始于硬段及软段部位与N,O相连的α位置的碳原子,在紫外光及氧气的联合作用下产生氢过氧化物;该过氧化合物一部分继续氧化成C=O,一部分通过β分裂,使C-N,C-O键断裂,致使材料龟裂。 |
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其他语种文摘
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According to the ageing problem of laminated transparency,the trasparent polyurethane film used as interlayer had been irradiated by fluorescent ultraviolet lamp for 0 h,200 h,300 h,and 500 h respectively. With the aid of ultraviolet / visible spectrophotometer, FTIR and SEM etc.,the color,structure and morphology of the materials were studied. SEM shows that when the irradiation time is increased to 500 h,the film surface cracks. The UV degradation mechanisms are that -CH_2- of the position connecting the O and N from hard segment and the soft segment are easy to oxidize and produce hydrogen peroxide under UV and oxygen,which is furtherly oxidized to C=O,and some part of the C-O and C-N bonds is cracked through β scission,and then the materials are fractured. |
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来源
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航空材料学报
,2017,37(1):93-98 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2016.000031
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关键词
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透明聚氨酯胶片
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紫外辐照
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FTIR
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老化机理
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地址
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1.
中国建筑材料科学研究总院, 北京, 100024
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海军驻北京地区航空军事代表局, 北京, 100073
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-5053 |
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学科
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化学工业 |
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文献收藏号
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CSCD:5921619
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