Dynamic Diffusion of Disperse Dye in a Polyethylene Terephthalate Film from an Infrared Spectroscopic Perspective
Dynamic Diffusion of Disperse Dye in a Polyethylene Terephthalate Film from an Infrared Spectroscopic Perspective
复制标题
从红外光谱角度观察分散染料在聚对苯二甲酸乙二醇酯薄膜中的动态扩散
DOI：
10.1021/acs.iecr.9b07110
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发表时间：
2020-04-22
影响因子：
4.2
通讯作者：
Wu, Peiyi
中科院分区：
文献类型：
--
作者：
Yan, Lina;Hou, Lei;Wu, Peiyi
采用衰减全反射-傅里叶变换红外光谱（ATFT）和二维相关光谱（2Dcos）研究了不同温度下分散红9（DR 9）在聚对苯二甲酸乙二醇酯（PET）薄膜中的扩散行为。根据Fickian扩散模型，观察到不同温度下DR 9在PET薄膜中的计算扩散系数随着温度的升高而增加，这可能归因于PET基质中自由体积和热运动的增加以及DR 9分子的快速运动。在较高的温度下。扩散光谱的详细分析辨别出各种分子间的相互作用，即DR 9的分子内氢键相互作用以及DR 9与PET之间的偶极-偶极和π-π相互作用。其中，从2Dcos分析中基团运动的顺序推断，DR 9的C = O基团与PET之间的偶极-偶极相互作用首先发生，并在DR 9的扩散过程中起着至关重要的作用。
The diffusion behavior of a typical disperse dye, disperse red 9 (DR 9), in the polyethylene terephthalate (PET) film at different temperatures was investigated by attenuated total reflection-Fourier transform infrared spectroscopy and 2D correlation spectroscopy (2Dcos) analyses. According to the Fickian diffusion model, the calculated diffusion coefficients of DR 9 in the PET film at different temperatures were observed to increase with temperature, which might be attributed to the increased free volume and thermal motion in the PET matrix and the rapid movement of DR 9 molecules at higher temperatures. In-detail analysis of the diffusion spectra discerned various kinds of molecular interactions, that is, intra-molecular hydrogen bonding interactions of DR 9 and dipole-dipole and pi-pi interactions between DR 9 and PET. Among these, the dipole-dipole interactions between C=O groups of DR 9 and PET occurred first and played a vital role during the diffusion process of DR 9, as deduced from the sequence order of group motions in 2Dcos analysis.