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首页> 外文期刊>Polymer Degradation and Stability >Photodegradation of polyethylenes: Comparative effect of Fe and Ca-stearates as pro-oxidant additives
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Photodegradation of polyethylenes: Comparative effect of Fe and Ca-stearates as pro-oxidant additives

机译：聚乙烯的光降解：铁和硬脂酸钙作为助氧化剂的比较效果

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摘要

The effect of iron and calcium stearates on the degradation of polyethylene (LDPE and LLDPE), under natural and artificial exposure, has been studied. The activity of stearates has been evaluated by chemiluminescence and FTIR of polyethylenes. The analysis of the molecular weight changes and content of degradation products identified by GC-MS during ageing process confirmed their pro-degrading activity. Films containing stearates exhibited lower CL emission, and revealed the higher efficiency of Fe-Stearate compared to Ca-Stearate in decomposing hydroperoxides, leading to higher degradation during processing. The results were confirmed by TGA analysis, where the weight loss onset and T_(max) shifted to lower temperatures in polyethylenes with incorporation of Fe- and Ca-stearates compared to pure polymers.rnPolyethylenes were outdoor and accelerated exposed, and CL measured at different period of times. Chemiluminescence temperature-ramping tests under nitrogen showed the formation of a peroxide peak at lower temperature, and a significant increase in carbonyl index for PE containing stearates was found by FTIR. The results were supported by GC-MS, where the concentration of extracted products identified in the polyethylenes containing Fe-stearate was significant, and a much greater decrease in molecular weight was determined by GPC, which confirmed the development of degradation for polyethylenes with Fe-Stearates in comparison to pure or Ca-stearate polyethylenes.
机译：研究了硬脂酸铁和钙在自然和人工暴露下对聚乙烯（LDPE和LLDPE）降解的影响。硬脂酸酯的活性已通过化学发光和聚乙烯的FTIR进行了评估。在老化过程中通过GC-MS鉴定的分子量变化和降解产物的含量分析证实了它们的降解活性。含有硬脂酸酯的薄膜表现出较低的CL发射，并显示出与硬脂酸钙相比，硬脂酸铁在分解氢过氧化物方面具有更高的效率，从而导致加工过程中的降解更高。 TGA分析证实了这一结果，与纯聚合物相比，掺入硬脂酸和硬脂酸的聚乙烯的失重开始和T_（max）转移到较低的温度.rn聚乙烯在室外暴露并加速暴露，在不同温度下测量CL一段时间。氮气下的化学发光温度梯度测试表明，在较低温度下会形成过氧化物峰，并且通过FTIR发现含PE的硬脂酸酯的羰基指数显着增加。结果得到了GC-MS的支持，其中含有硬脂酸铁的聚乙烯中鉴定出的提取产物浓度很高，而GPC测定的分子量下降幅度更大，这证实了用Fe-聚乙烯降解聚乙烯的过程已经发展。与纯或硬脂酸钙聚乙烯相比，硬脂酸酯。

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  • 来源
    《Polymer Degradation and Stability》 |2010年第10期|p.2057-2064|共8页
  • 作者

    J.L. Pablos; rnC. Abrusci; rnI. Marin; rnJ. Lopez-Marin; rnF. Catalina; rnE. Espi; rnT. Corrales;

  • 作者单位

    Departamento de Fotoquimica de Polimeros, Institute de Ciencia y Tecnologia de Polimeros, C.S.I.C., Juan de la Cierva 3, 28006 Madrid, Spain;

    rnDepartamento de Biologia Molecular, Facultad de Ciencias, Universidad Autonoma de Madrid-UAM, Cantoblanco, 28049 Madrid, Spain;

    rnDepartamento de Biologia Molecular, Facultad de Ciencias, Universidad Autonoma de Madrid-UAM, Cantoblanco, 28049 Madrid, Spain;

    rnDepartamento de Hortofruticultura, Institute Murciano de Investigation y Desarrollo Agrario y Alimentario, Mayor. 1., 30150 La Alberca, Murtia, Spain;

    rnDepartamento de Fotoquimica de Polimeros, Institute de Ciencia y Tecnologia de Polimeros, C.S.I.C., Juan de la Cierva 3, 28006 Madrid, Spain;

    rnRepsol, Ctra. A-5, Km. 18, M6stoles, 28931 Madrid, Spain;

    rnDepartamento de Fotoquimica de Polimeros, Institute de Ciencia y Tecnologia de Polimeros, C.S.I.C., Juan de la Cierva 3, 28006 Madrid, Spain;

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  • 正文语种 eng
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  • 关键词

    photodegradation; polyethylene; pro-oxidant; chemiluminescence;

    机译：光降解聚乙烯促氧化剂化学发光;

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