超临界水中过氧化苯甲酰对聚乙烯降解的促进作用  

EFFECT OF ADDITIVE BENZOYL PEROXIDE ON THE DEPOLYMERIZATION OF HDPE IN SUPERCRITICAL WATER

作　　者：吴学华[1] 苏磊[1] 刘秀茹[1] 陈丽英[1] 陈克宇[2] 洪时明[1] 

机构地区：[1]西南交通大学高压物理实验室 [2]四川大学高分子材料系,四川成都610065

出　　处：《高分子材料科学与工程》2006年第1期135-137,141,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(59972022)

摘　　要：首次研究了一种添加剂——过氧化苯甲酰(BPO)对高密度聚乙烯在超临界水中降解行为的影响。对使用添加剂和未使用添加剂的实验产物采取多种方式检测对比,得到结论:在降解反应的前30 m in内,聚乙烯降解效率最高;温度是影响降解反应的重要因素;在反应温度较低和反应时间较短的情况下,添加BPO可以有效促进聚乙烯的降解,达到与未添加BPO实验中高温和长时间反应相比拟的效果。同时本文讨论了聚乙烯在超临界水中降解反应机理,对BPO在反应中的促进作用也进行了分析。For the first time, effect of benzoyl peroxide （BPO） on the depolymerization behavior of high density polyethylene （HDPE） in supercritical water was reported in the article. Two series of experiments with and without BPO were run at temperature of 380 ℃, 400 ℃ or 420 ℃ and pressure about 25 MPa for 30 min, 60 min or 120 min respectively. The color and phase character of products were observed and compared, the mean molecular weight of samples was estimated by Ostwald viscometer, the components IR and GC-MS. and configurations of products were analyzed by The results show that HDPE can be entirely decomposed to oligomers and monomers under the experimental conditions; Efficiency of depolymerization is the utmost in the first 30 minutes; Obviously, the decomposition of HDPE can be promoted with temperature increase in supercritical water condition. At lower temperature and shorter reaction time, effect of additive BPO on PE depolymerization is equivalent to that at higher reaction temperature and longer time in the experiments without BPO. The reaction mechanism was also discussed in the paper.

关 键 词：超临界水 降解 高密度聚乙烯 过氧化苯甲酰 

分 类 号：O631.33[理学—高分子化学]