论文部分内容阅读
通过拉伸强度和断裂伸长率、TG以及FTIR的测试分析,研究硬脂酸铁(FeSt3)含量不同的4种煤基聚乙烯薄膜在模拟自然光条件下的光-热降解性能。结果表明:光照时薄膜中添加的煤粉在FeSt3作用下发生自由基反应,引发聚乙烯大分子断链,产生羰基;羰基指数随薄膜中FeSt3含量的增加而增大,但薄膜力学性能相应降低,热稳定性则有所增强;聚乙烯大分子链结构在光照作用下发生脱羰基反应,断裂成小分子链;降解薄膜在光照72小时前处于衰变期,72小时后进入脆变期。
Based on the tensile strength, elongation at break, TG and FTIR, four kinds of coal-based polyethylene films with different contents of iron stearate (FeSt3) were studied for their light-heat degradation under simulated natural light conditions. The results showed that the pulverized coal added with FeSt3 under irradiation of light had a radical reaction, which led to the breaking of the polyethylene macromolecule and the formation of carbonyl. The carbonyl index increased with the increase of FeSt3 content in the film, but the mechanical properties of the film decreased accordingly While the thermal stability is enhanced. The polyethylene macromolecule chain undergoes decarbonylation reaction under the action of light and breaks into small molecular chains. The degradation film is in the decay period 72 hours before light and enters the period of embrittlement 72 hours later.