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首页> 外文期刊>Arabian Journal for Science and Engineering >Modeling of the Kinetics Degradation of Unstabilized and HALS-Stabilized LDPE Films Under Thermo-Oxidation and Natural Weathering Conditions
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Modeling of the Kinetics Degradation of Unstabilized and HALS-Stabilized LDPE Films Under Thermo-Oxidation and Natural Weathering Conditions

机译：热氧化和自然风化条件下不稳定和HALS稳定的LDPE薄膜动力学降解的建模

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摘要

Mathematical models are proposed to predict degradation of unstabilized low-density polyethylene (LDPE) and LDPE stabilized with hindered amine light stabilizers (HALS) under both thermo-oxida-tions at 70, 80 and 90 °C and natural weathering conditions (NWC). The degradation was measured by change in percent elongation at break (ε_r) with time. The mathematical approach developed was multiple linear regression analysis (MLRA). The reliability of the selected models was analyzed using four statistical criteria: residual variance, coefficient of determination (r2), Student test and Fisher-Snedecor test. The linear systems that resulted from the MLRA were solved using the GAUSS method. The results obtained indicated that the polynomial models developed to predict elongation at break were reliable for both unstabilized and HALS-stabilized samples under thermo-oxidation at 70, 80 and 90 °C and NWC This was also confirmed by the comparison of the half-life time values predicted from the models with those observed experimentally.
机译：提出了数学模型来预测不稳定的低密度聚乙烯（LDPE）和受阻胺光稳定剂（HALS）稳定的LDPE在70、80和90°C的热氧化和自然气候条件（NWC）下的降解。通过断裂伸长率（ε_r）随时间的变化来测量降解。开发的数学方法是多元线性回归分析（MLRA）。使用四个统计标准对所选模型的可靠性进行了分析：残差方差，确定系数（r2），学生检验和Fisher-Snedecor检验。 MLRA产生的线性系统使用GAUSS方法求解。获得的结果表明，用于预测断裂伸长率的多项式模型对于在70、80和90°C以及NWC进行热氧化时未稳定的样品和HALS稳定的样品都是可靠的。这也通过半衰期的比较得到了证实。从模型预测的时间值与通过实验观察到的时间值。

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