Dynamic Diffusion of Disperse Dye in a Polyethylene Terephthalate Film from an Infrared Spectroscopic Perspective

• DOI: 10.1021/acs.iecr.9b07110
• Publication Date: 2020-04-03T06:54:33Z
• Authors: Lina Yan; Lei Hou; Shengtong Sun; Peiyi Wu
• Keywords: Attenuated total reflection

The diffusion behavior of a typical disperse dye, 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 (2Dcos) analyses. According to Fickian model, calculated coefficients DR PET were observed increase with temperature, which might be attributed increased free volume thermal motion matrix rapid movement molecules higher temperatures. In-detail analysis spectra discerned various kinds molecular interactions, that is, intramolecular hydrogen bonding interactions dipole–dipole π–π between PET. Among these, C═O groups occurred first played vital role during process 9, as deduced from sequence order group motions 2Dcos analysis.