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首页> 外文期刊>Journal of Applied Polymer Science >Determination of Mass Transport Properties in Food/Packaging Systems by Local Measurement with Raman Microspectroscopy
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Determination of Mass Transport Properties in Food/Packaging Systems by Local Measurement with Raman Microspectroscopy

机译：通过拉曼光谱局部测量确定食品/包装系统中的传质特性

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摘要

A fast, nondestructive method based on the determination of local concentration profiles in the polymer thickness with Raman microspectroscopy is presented here. It was used to assess the diffusivity of a model molecule (p-terphenyl) in amorphous polystyrene films at 95°C (2.38±1.08×10~(-17) m~2/s). This methodology was validated by comparison with a more classical destructive approach based on the monitoring of the concentration evolution in the whole of the film with gas chromatography (89.4×10~(-17) m~2/s). These values were in agreement with data available in the literature for molecules of the same molecular weight and temperature range determined with local measurement and were significantly lower than those determined by global measurement. Raman microspectroscopy was found to be adapted to slow diffusion speeds typically found in high-barrier polymers; this allowed diffusivity to be obtained long before the equilibrium was reached and, thus, without the need for the partition coefficient. VC 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40958.
机译：本文介绍了一种快速，无损的方法，该方法基于拉曼显微光谱法确定聚合物厚度中的局部浓度分布。用于评估模型分子（对-三联苯）在95°C（2.38±1.08×10〜（-17）m〜2 / s）下在非晶聚苯乙烯薄膜中的扩散率。通过与基于气相色谱（89.4×10〜（-17）m〜2 / s）的整个薄膜浓度变化监测的更经典的破坏性方法进行比较，验证了该方法的有效性。这些值与文献中对于通过局部测量确定的相同分子量和温度范围的分子的数据一致，并且显着低于通过整体测量确定的分子。人们发现拉曼光谱法可以降低通常在高阻隔聚合物中发现的扩散速度。这允许在达到平衡之前很久就获得了扩散率，因此不需要分配系数。 VC 2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2014，131，40958。

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