复合硫化物近常温热催化降解低密度聚乙烯薄膜

Thermocatalytic degradation of low density polyethylene film using composite sulfide near room temperature

摘要:

采用回流法合成新型热敏催化剂，将其与低密度聚乙烯(LDPE)熔融共混制得复合薄膜，并置于近常温黑暗烘箱中热催化降解。通过扫瞄式电子显微镜(SEM)、X射线能量色散光谱分析(EDX)、力学性能、原子力显微镜(AFM)、热重分析(TG)、凝胶渗透色谱(GPC)和傅里叶变换红外光谱(FT-IR)等表征手段对研究复合薄膜的热降解性能进行了研究。结果表明：纯聚乙烯薄膜在黑暗近常温条件下亦能发生热降解，但效果甚微；而复合薄膜的降解效果明显优于纯聚乙烯薄膜。在55℃下热降解45 d后，复合薄膜力学性能明显下降，粗糙度明显增加且周围出现了不同程度的褶皱与鳞片状结构，甚至于剥落现象，热分解温度下降13℃，分子量亦明显减小，同时出现了羧基和羟基等特征吸收峰。

Abstract:

A novel thermal sensitive catalyst was synthesized by the reflux method and then added into the low density polyethylene (LDPE) film, the thermocatalytic degradation of films was conducted in oven with near room temperature under darkness. The obtained samples were characterized with Scan electron microscope (SEM), Energy dispersive analysis of X-ray (EDX), Mechanical properties, Atomic force microscope (AFM), Thermogravimetry (TG), Gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FT-IR). Results showed that the composite film was thermally degraded obviously, while pure polyethylene film changed slightly. After thermodegradation for 45 days under 55oC, mechanical properties decreased obviously of composite film, roughness increased significantly and some fold and scaly structure appeared on the surface, thermal decomposition temperature of which reduced by 13oC, molecular weight also significantly dropped, besides, the characteristic absorption peaks such as carboxylic acid and hydroxy were observed as well.