紫外光对乙二醛聚合物结构与性能的影响

乙二醛聚合物是我国目前应用最广的饱水木漆器文物脱水加固保护材料。文中采用傅里叶变换红外光谱、X射线衍射和差示扫描量热等方法研究了在波长351 nm的紫外光辐照后乙二醛聚合物结构与性能的变化。结果显示,乙二醛聚合物的化学结构多为含氧五元环和六元环,其分子结构存在晶粒尺寸较小的微晶单元。乙二醛聚合物吸收紫外光后,其含氧环结构中的C—O—C键被破坏,结晶度逐渐降低且玻璃化转变现象逐渐消失。经紫外光辐照试验后,试样失水质量降低;表面逐渐产生凸起、破裂,且光泽度逐渐降低;其颜色先向橙黄色转变,随后变为浅黄色。

A Discussion on Forewarning and Management of Crises to Vocational and Technical School

Some vocational and technical schools, facing every kind of crises, should have scientific forewarning and management methods to resolve these problems. After classifying the crises and analyzing the cause, this paper makes use of the modem-forewarning and management theories to discuss the forewarning and management method of the crises of the vocational and technical school.