研究目的
Investigating the diffusion behavior of disperse red 9 (DR 9) in polyethylene terephthalate (PET) film at different temperatures to understand the molecular interactions and diffusion mechanisms.
研究成果
The diffusion coefficients of DR 9 in PET films increase with temperature, attributed to increased free volume and thermal motion in PET and faster movement of DR 9 molecules. Dipole?dipole interactions between CO groups of DR 9 and PET play a predominant role in the early diffusion stage. Intramolecular hydrogen bonding in DR 9 enhances its planarity, facilitating diffusion. π?π interactions between aromatic groups of DR 9 and PET become significant in later stages, slightly weakening intramolecular hydrogen bonding.
研究不足
The study is limited to the diffusion behavior of DR 9 in PET films under specific temperature conditions. The Fickian diffusion model showed some discrepancies at higher temperatures, possibly due to thermal swelling of the PET matrix.
1：Experimental Design and Method Selection:
The study utilized attenuated total reflection?Fourier transform infrared spectroscopy (ATR?FTIR) and two-dimensional correlation spectroscopy (2Dcos) to monitor the diffusion process of DR 9 in PET films at various temperatures.
2：Sample Selection and Data Sources:
DR 9 and PET films were used as samples. ATR?FTIR spectra were collected at 130, 140, 150, and 160 °C.
3：List of Experimental Equipment and Materials:
A Nicolet Nexus 6700 FTIR spectrometer equipped with a DTGS detector was used for ATR?FTIR measurements.
4：Experimental Procedures and Operational Workflow:
The PET film was preheated on the ATR crystal for 30 min. DR 9 was sandwiched between the PET and cellulose films, and spectra were collected at 50 s intervals.
5：Data Analysis Methods:
The Fickian diffusion model was applied to calculate diffusion coefficients. 2Dcos analysis was performed to study molecular interactions and sequence of group motions.
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