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首页> 外文期刊>Journal of Applied Polymer Science >A practical model of the diffusion of oil-based fluid into polyethylene
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A practical model of the diffusion of oil-based fluid into polyethylene

机译：油基流体扩散到聚乙烯中的实际模型

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摘要

It is possible to modify the properties of semicrystalline polymers using diffusion to introduce additional functionality. For example, Vitamin E infused polyethylene has antioxidant properties, which enhances the longevity of the polyethylene. Lipiodol ultra fluid, an iodinated oil-based contrast agent, can be used to enhance the X-ray attenuation of medical grade polyethylene. To manufacture a part geometry with a sufficiently even distribution of oil for radiopacity, while maintaining the thermally dependent properties of the polymer (e.g., crystallinity) is a challenge. Rather than relying on trial and error, this study aimed to identify the simplest, most practical model, which could assist with planning for manufacturing of such parts. Models in 1D, 2D, and 3D were examined but only the 3D Fickian model was able to predict the profile of oil diffusion within polyethylene with suitable performance (as low as 7% inaccuracy for some diffusion conditions). The model was more accurate at the surface of the samples and at lower diffusion temperatures. The 3D Fickian model used in this study was capable of estimating the oil concentration in the surface of a polyethylene part after diffusion to a sufficient accuracy for planning manufacturing processes of oil-infused polyethylene parts.
机译：可以通过扩散来改变半结晶聚合物的性质，从而引入额外的功能。例如，注入维生素E的聚乙烯具有抗氧化性能，从而延长聚乙烯的使用寿命。碘油超流体是一种基于碘化油的造影剂，可用于增强医用级聚乙烯的X射线衰减。要制造出一种具有足够均匀的油分布的零件几何形状，以实现辐射防护性，同时保持聚合物的热依赖性（例如结晶度）是一个挑战。这项研究的目的不是依靠试错法，而是找出最简单、最实用的模型，以帮助规划此类零件的制造。对1D、2D和3D模型进行了检查，但只有3D Fickian模型能够以合适的性能预测石油在聚乙烯中的扩散曲线（对于某些扩散条件，误差低至7%）。该模型在样品表面和较低的扩散温度下更准确。本研究中使用的3D Fickian模型能够估计扩散后聚乙烯零件表面的油浓度，其精度足以规划充油聚乙烯零件的制造工艺。

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