Oxidation induction time and oxidation onset temperature of polyethylene in air

被引：38
作者：
Focke, Walter W. [1 ,2 ]
van der Westhuizen, Isbe [1 ,2 ]
机构：
[1] Univ Pretoria, Inst Appl Mat, Dept Chem, ZA-0002 Pretoria, South Africa
[2] Univ Pretoria, Dept Chem Engn, ZA-0002 Pretoria, South Africa
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2010年 / 99卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
Accelerated ageing; Antioxidant; Oxidation induction time; Polyethylene; DIFFERENTIAL SCANNING CALORIMETRY; THERMAL-OXIDATION; ACTIVATION-ENERGY; POLYMERS; KINETICS; APPROXIMATION; STABILIZATION; REEXAMINATION; PREDICTION; PERIODS;
D O I：
10.1007/s10973-009-0097-1
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Oxidation induction times (OIT) and oxidation onset temperatures (OOT) of a low density polyethylene melt were evaluated in air using DSC. Good regression fits to OOT data were obtained using global values for the activation energy (E) that are specific for each antioxidant but assumed independent of concentration. Gimzewski's postulate that OIT and OOT correspond to the same level of antioxidant depletion was tested by attempting to predict OIT values from OOT generated model parameters. The deviations between predicted and experimental OIT values were comparable in magnitude to the inherent scatter in the data. However, regression of the dynamic OOT data yielded statistically significant lower values for the activation energy than are obtained by direct regression of isothermal data.
引用
收藏
页码：285 / 293
页数：9
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