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Accelerated Ageing of Polypropylene Stabilized by Phenolic Antioxidants Under High Oxygen Pressure

机译:高压下酚类抗氧化剂稳定的聚丙烯加速老化

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Polypropylene (PP) samples stabilized by a hindered phenol (Irganox 1010) were submitted to thermal ageing at 80 degrees C in air at atmospheric pressure or in pure oxygen at 5.0 MPa pressure. Both the polymer oxidation and the stabilizer consumption were monitored by Infrared spectrometry and thermal analysis. The stabilizer efficiency, as assessed by the ratio induction time/stabilizer concentration is almost constant at atmospheric pressure even when the stabilizer concentration is higher than its solubility limit in PP (0.4% or 24 x 10(-3) mol L-1). In contrast, at high pressure, the efficiency decreases almost hyperbolically with the stabilizer concentration when this latter is higher than 6.0 x 10(-3) mol L-1. The results indicate the existence of a direct phenol-oxygen reaction negligible at low oxygen pressure but significant at 5.0 MPa pressure. The reality of this reaction has been proved on the basis of a study of the thermal oxidation of a phenol solution in a nonoxidizable solvent. A kinetic model of PP oxidation in which stabilization involves three reactions has been proposed. It simulates correctly the effect of oxygen pressure and stabilizer concentration on carbonyl build-up and stabilizer consumption. (C) 2008 Wiley Periodicals, Inc. J Appl Polyra Sci 110: 3313-3321, 2008
机译:用受阻酚(Irganox 1010)稳定的聚丙烯(PP)样品在大气压下的空气中或在5.0 MPa压力下的纯氧中于80摄氏度进行热老化。聚合物氧化和稳定剂消耗均通过红外光谱法和热分析监测。用稳定剂的诱导时间/稳定剂的比例来评估稳定剂的效率在大气压下几乎是恒定的,即使稳定剂的浓度高于其在PP中的溶解度极限(0.4%或24 x 10(-3)mol L-1)。相反,在高压下,当稳定剂浓度高于6.0 x 10(-3)mol L-1时,效率几乎随双曲线而降低。结果表明在低氧气压力下可忽略的直接酚-氧反应存在,但在5.0 MPa压力下显着。该反应的真实性已基于对苯酚溶液在不可氧化溶剂中的热氧化研究的基础上得到了证明。已经提出了其中涉及三个反应的稳定化的PP氧化动力学模型。它可以正确模拟氧气压力和稳定剂浓度对羰基积累和稳定剂消耗的影响。 (C)2008 Wiley Periodicals,Inc. J Appl Polyra Sci 110:3313-3321,2008

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