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首页> 外文期刊>Journal of Polymers and the Environment >Study of Aging Characteristics of Ternary Blends of Polyethylenes-Ⅱ
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Study of Aging Characteristics of Ternary Blends of Polyethylenes-Ⅱ

机译：聚乙烯三元共混物的老化特性研究Ⅱ

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Six film samples of low-density polypropylene (LDPE)/linear LDPE (LLDPE)/high-density polypropylene (HDPE) with varying ratios of LDPE (20-45 ... wt%) and LLDPE (25-50 wt%) having a fixed amount of HDPE at 30 wt% were prepared by blown film extrusion technique. The samples were aged at four different temperatures, 55°, 70°, 85°, and 100℃, for four different time periods in the interval of between 150 hours and up to 600 hours. The change in the structure of various constituents and the formation of various oxygenated (peroxy and hydroperoxy) and unsaturated groups during thermo-oxidative degradation was discussed by infrared spectroscopy. The visiosity-average molecular weight was found to have decreased slowly in the initial aging hours and temperatures, whereas it decreased by 10% with its previous value tensile strength that is, 100℃ when aged for 600 hours. The tensile strength of the sample first increased by 67% at 55℃ and 89% at 70℃ up to 450 hours, whereas the values increased by 52.5% at 85℃ and 33.9% at 100℃ when aged for 150 hours and then decreased. The percentage elongation at break increased by 2.7% at 55℃ and 10.7% at 70℃ for 150 and 300 hours of aging, respectively, whereas the percentage decreased when aged at 85℃ and 100℃ for up to 600 hours of aging. The values of gel content (percent) increased and initial degradation temperature decreased with aging time and temperature.
机译：六个低密度聚丙烯（LDPE）/线性LDPE（LLDPE）/高密度聚丙烯（HDPE）的薄膜样品，其中LDPE（20-45 ... wt％）和LLDPE（25-50 wt％）的比率不同通过吹膜挤出技术制备固定量的30重量％的HDPE。将样品分别在55°，70°，85°和100°C的四种不同温度下进行老化，时间间隔为150小时至600小时之间的四个不同时间段。通过红外光谱讨论了热氧化降解过程中各种成分的结构变化以及各种氧​​化基团（过氧和氢过氧）和不饱和基团的形成。发现在最初的老化时间和温度下，粘度平均分子量缓慢降低，而以其先前的值拉伸强度，即在老化600小时后为100℃，降低了10％。样品的抗拉强度在长达450小时的条件下，首先在55℃下增加67％，在70℃下增加89％，而在老化150小时后，其拉伸强度在85℃下增加52.5％，在100℃下增加33.9％，然后降低。老化150小时和300小时，断裂伸长率分别在55℃和2.7℃下分别增长2.7％和10.7％，而在老化温度高达600小时的85℃和100℃下，断裂伸长率则下降。凝胶含量（百分比）的值随着老化时间和温度的增加而增加，初始降解温度降低。

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