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Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene

机译：聚丙烯热处理过程中形态变化的光谱诊断

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摘要

Polypropylene is considered as a representative thermoplastic matrix for advanced composite materials that have some advantages in various engineering applications. Wide-range infrared optical properties of polypropylene are important for combined heat transfer modeling in these composite materials, which are semitransparent in a considerable part of the whole spectral range. This study is focused on optical properties of polypropylene in the visible and near-infrared ranges because the measurements in these ranges exhibit a stronger effect of the processing temperature used in the material manufacturing. The experimental study is based on spectral measurements of both the normal-hemispherical reflectance and transmittance of polypropylene samples. The main characteristics of volumetric absorption and scattering are identified using the inverse problem solution based on the modified two-flux approximation, which is sufficiently accurate to determine the hemispherical characteristics of the radiation field in the range of the problem parameters. In particular, the effect of a relatively strong scattering is observed at the absorption peaks in the near-infrared range. An approximate theoretical model based on spectroscopic data is developed to estimate morphological changes arising in thermal processing of polypropylene at different temperatures.
机译：聚丙烯被认为是高级复合材料的代表热塑性基质，在各种工程应用中均具有一些优势。聚丙烯的宽范围红外光学特性对于这些复合材料的组合传热建模非常重要，这些复合材料在整个光谱范围的相当一部分是半透明的。这项研究的重点是在可见光和近红外范围内的聚丙烯的光学性能，因为在这些范围内的测量结果显示出材料制造中所用加工温度的较强影响。实验研究是基于对聚丙烯样品的正常半球反射率和透射率的光谱测量。使用基于改进的双通量近似的反问题解，可以确定体积吸收和散射的主要特征，该问题解的精确度足以确定问题参数范围内的辐射场的半球特征。特别地，在近红外范围内的吸收峰处观察到相对强的散射的效果。建立了基于光谱数据的近似理论模型，以估计在不同温度下聚丙烯热处理过程中产生的形态变化。

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