以纳米二氧化钛(nano-TiO2)为热催化剂,与低密度聚乙烯(LDPE)熔融共混制备出LDPE/TiO2复合薄膜,并置于黑暗烘箱中低温(30～50℃)热老化.利用傅里叶变换红外光谱、热重分析、差示扫描量热法和扫描电子显微镜对复合薄膜的热降解行为进行了表征.结果表明,纯聚乙烯薄膜和聚乙烯复合薄膜在黑暗低温条件下也会发生热降解,且nano-TiO2填充量越大,温度越高,热降解效果越明显.nano-TiO2填充量为5％的复合薄膜在50℃热老化90 d后,复合薄膜中出现羰基和羧基,聚乙烯分子支链减少且生成了小相对分子质量的物质,复合薄膜的热分解温度T5％从473.5℃降低到433.8℃,结晶度从33.1％升高到35.3％,薄膜表面也变得凹凸不平.
参考文献
| [1] | Kumanayaka, TO;Parthasarathy, R;Jollands, M .Accelerating effect of montmorillonite on oxidative degradation of polyethylene nanocomposites[J].Polymer Degradation and Stability,2010(4):672-676. |
| [2] | Li, G.;Sarazin, P.;Orts, W.J.;Imam, S.H.;Favis, B.D. .Biodegradation of thermoplastic starch and its blends with poly(lactic acid) and polyethylene: Influence of morphology[J].Macromolecular chemistry and physics,2011(11):1147-1154. |
| [3] | Horacio Vieyra Ruiz;Eduardo San Martin Martinez;Miguel Angel Aguilar Mendez .Biodegradability of polyethylene-starch blends prepared by extrusion and molded by injection: Evaluated by response surface methodology[J].Starch: International Journal for the Investigation, Processing and Use of Carbohydrates and their Derivatives: Internationale Zeitschrift fur die Erforschung, Verarbeitung und Verwendung von Kohlenhydraten und deren Derivaten,2011(1/2):42-51. |
| [4] | Pablos, J.L.;Abrusci, C.;Marín, I.;López-Marín, J.;Catalina, F.;Espí, E.;Corrales, T. .Photodegradation of polyethylenes: Comparative effect of Fe and Ca-stearates as pro-oxidant additives[J].Polymer Degradation and Stability,2010(10):2057-2064. |
| [5] | 熊裕华,李凤仪.Fe3+掺杂TiO2光催化降解聚乙烯薄膜的研究[J].物理化学学报,2005(06):607-611. |
| [6] | Thomas, R.T.;Nair, V.;Sandhyarani, N..TiO2 nanoparticle assisted solid phase photocatalytic degradation of polythene film: A mechanistic investigation[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2013:1-9. |
| [7] | Weon, JI .Effects of thermal ageing on mechanical and thermal behaviors of linear low density polyethylene pipe[J].Polymer Degradation and Stability,2010(1):14-20. |
| [8] | P.K. Roy;P. Surekha;C. Rajagopal;S.N. Chatterjee;V. Choudhary .Studies on the photo-oxidative degradation of LDPE films in the presence of oxidised polyethylene[J].Polymer Degradation and Stability,2007(6):1151-1160. |
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