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首页> 外文期刊>Journal of Applied Polymer Science >FOOD AND PACKAGING INTERACTIONS - USE OF METHYL RED AS A PROBE FOR PVC SWELLING BY FATTY ACID ESTERS
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FOOD AND PACKAGING INTERACTIONS - USE OF METHYL RED AS A PROBE FOR PVC SWELLING BY FATTY ACID ESTERS

机译：食物和包装的相互作用-甲基酯用作甲基酯在PVC溶胀中的用途

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A study of the interaction of fatty foods with rigid PVC packages was undertaken, using fatty acid esters CH3(CH2)(n-2)COOR (8 less than or equal to n less than or equal to 18; R = Me, Et) as food simulants. Determination at 50 degrees C of weight uptaken by PVC and of depth of penetration of the simulant into the material allowed us to define the time required to reach a thermodynamic equilibrium and the amount of liquid sorbed. Sorption at equilibrium decreased when chain length increased. When the simulant was tinted by methyl red, the dye adsorbed by the material was located exclusively in the diffusion layer. In contrast to sorption of the simulant, the absorbance of the dye in PVC went through a maximum for n = 14. Its spectrum depended on the extent of swelling of the polymer. In materials swollen by short-chain esters, the dye preferred a nonplanar conformation, stabilized through intermolecular solvatation by fatty acid esters. When solvatation and swelling were weak (n = 16, 18), the dye adopted a planar conformation, driven by intramolecular chelation, with a higher lambda(max) and a large extinction coefficient. Methyl red thus appeared as a probe for the study of interactions with slight swelling. (C) 1996 John Wiley & Sons, Inc. [References: 24]
机译：使用脂肪酸酯CH3（CH2）（n-2）COOR（8小于或等于n小于或等于18; R = Me，Et）对脂肪食品与硬质PVC包装之间的相互作用进行了研究。作为食物模拟物。在50摄氏度下测定PVC吸收的重量以及模拟物在材料中的渗透深度，这使我们能够定义达到热力学平衡所需的时间和吸收的液体量。当链长增加时，平衡时的吸附减少。当模拟物用甲基红染色时，被材料吸附的染料仅位于扩散层中。与模拟物的吸附相反，染料在PVC中的吸光度在n = 14时达到最大值。其光谱取决于聚合物的溶胀程度。在被短链酯溶胀的材料中，该染料优选非平面构象，并通过脂肪酸酯的分子间溶剂化作用得以稳定。当溶剂化和溶胀很弱（n = 16、18）时，染料采用分子内螯合驱动的平面构象，具有更高的λ（max）和大的消光系数。因此，甲基红似乎是研究轻微溶胀相互作用的探针。 （C）1996 John Wiley＆Sons，Inc. [参考：24]

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