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Evaporative loss kinetics of di(2-ethylhexyl)phthalate (DEHP) from pristine DEHP and plasticized PVC

机译:原始DEHP和增塑PVC中邻苯二甲酸二(2-乙基己基)酯(DEHP)的蒸发损失动力学

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摘要

The migration of di(2-ethylhexyl)phthalate (DEHP) from poly(vinyl chloride) (PVC) to a surrounding gas phase at temperatures below 120 ℃ kinetically is controlled by evaporation. The effects on the DEHP loss rate of nitrogen flow rate, relative humidity and degradation of the plasticizer at 100 ℃ was assessed. The sample mass decreased linearly with time for both pristine DEHP and plasticized PVC at comparable rates, suggesting that a thin film of DEHP was present on the jacketing insulation during desorption. The latter hypothesis was supported by infrared spectroscopy and by the fact that DEHP is an amphiphilic molecule that will tend to aggregate at the surface with the hydrophobic 2-ethylhexyl units at the air interface. The effect on the migration rate of moisture present in the gas phase was negligible. The DEHP loss rate increased in a retarding non-linear fashion with increasing gas flow rate. In one of the experiments, DEHP was accidently degraded as revealed by discoloration, the presence of low molar mass degradation products (liquid chromatography) containing additional carbonyl groups (infrared spectroscopy) and an increase in the evaporation rate at temperatures between 100 and 130 ℃
机译:邻苯二甲酸二(2-乙基己基)酯(DEHP)从聚(氯乙烯)(PVC)向120℃以下的气相迁移的动力学是通过蒸发来控制的。评估了100℃时氮流量对DEHP损失率,相对湿度和增塑剂降解的影响。原始DEHP和增塑PVC的样品质量均随时间呈线性下降,且速率相当,这表明在脱附过程中护套绝缘层上存在DEHP薄膜。后一种假设得到红外光谱学和DEHP是两亲分子的支持,该分子将趋于在表面聚集,并在空气界面处带有疏水性2-乙基己基单元。对气相中水分迁移速率的影响可以忽略不计。 DEHP损失率随着气体流量的增加而以非线性延迟的方式增加。在其中一项实验中,通过变色,含有附加羰基的低摩尔质量降解产物(液相色谱)(红外光谱)以及在100到130℃之间的蒸发速率增加,发现DEHP被意外降解。

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