Structure and Diffusion Behavior of Trioctyl Trimellitate (TOTM) in PVC Film Studied by ATR-IR Spectroscopy
| Autor: | Peiyi Wu, Bin Li, Zhangwei Wang, Jeffrey M. Cogen, Hengjie Lai, Bharat I. Chaudhary, Saurav S. Sengupta |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
General Chemical Engineering Diffusion Plasticizer Analytical chemistry Infrared spectroscopy General Chemistry Industrial and Manufacturing Engineering Vinyl chloride chemistry.chemical_compound chemistry Density functional theory Fourier transform infrared spectroscopy Spectroscopy Trioctyl trimellitate |
| Zdroj: | Industrial & Engineering Chemistry Research. 51:9365-9375 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie300007m |
| Popis: | Tri-2-ethylhexyltrimellitate (TOTM) is one of the commercially used plasticizers for poly(vinyl chloride) (PVC). In this work, the diffusion behavior of TOTM in PVC films is investigated through real-time ATR-IR spectroscopy at 25, 40, and 70 °C, and the ratio changes of three C═O structures of TOTM are plotted as a function of diffusion time. TOTM itself is composed of two types of C═O structures: one C═O structure represents a free state and the other represents an aggregated C═O state formed by dipolar–dipolar interactions, as confirmed by the second derivative of FTIR and density functional theory (DFT). Furthermore, another new band related to C═O groups of TOTM was observed during diffusion experiments in PVC at different temperatures, which can be assigned to dipolar–dipolar interactions between TOTM and PVC (interacting C═O structure). These results show that the diffusion coefficients of TOTM in PVC increase with temperature. Conversely, the equilibrium concentrations of TOTM in PVC films decreas... |
| Databáze: | OpenAIRE |
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