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首页> 外文期刊>Journal of Applied Polymer Science >Additive diffusion from LDPE slabs into contacting solvents as a function of solvent absorption
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Additive diffusion from LDPE slabs into contacting solvents as a function of solvent absorption

机译：从LDPE平板到接触溶剂的添加剂扩散取决于溶剂吸收

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This article describes the simultaneous diffusion of a migrant and a solvent in low density polyethylene (LDPE). The migrant (Irganox 1076) moves out of the slab, while the solvent (isooctane, n-heptane or cyclohexane) moves inwards. Solvent absorption was measured separately by following the increase of the mass of the slab in time. It can be described by the Fick diffusion equation with a diffusivity depending on the solvent concentration, and an interface concentration depending on time. The final absorptions were 12% for isooctane, 14% for n-heptane, and 29% for cyclohexane. Additive concentrations in the slab were determined at different positions by microtoming. Experiments were done for several Contacting times. The concentration profiles were strongly affected by the solvent. A larger local solvent concentration increases the diffusivity of the migrant. The Fick equation with a migrant diffusivity depending on the solvent concentration gives a good description for the results with isooctane and n-heptane. The description is less good for the measurements with cyclohexane (when the polymer swells strongly). (C) 2003 Wiley Periodicals, Inc. [References: 21]
机译：本文介绍了迁移物和溶剂在低密度聚乙烯（LDPE）中的同时扩散。迁移物（Irganox 1076）从平板中移出，而溶剂（异辛烷，正庚烷或环己烷）则向内移动。通过随时间推移平板质量的增加来分别测量溶剂吸收。可以通过Fick扩散方程式来描述，其扩散率取决于溶剂浓度，界面浓度取决于时间。最终吸收为异辛烷为12％，正庚烷为14％，环己烷为29％。通过切片机在不同位置确定了平板中的添加剂浓度。实验进行了几次接触时间。浓度曲线受到溶剂的强烈影响。较大的局部溶剂浓度会增加迁移物的扩散率。 Fick方程的迁移率取决于溶剂的浓度，对异辛烷和正庚烷的结果给出了很好的描述。该描述对于用环己烷进行的测量（当聚合物强烈溶胀时）不太好。 （C）2003 Wiley Periodicals，Inc. [参考：21]

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