Abstract
Poly(vinyl chloride) (PVC) containing small amounts of cholesterol (Ch), cholesteryl chloride (ChCl), and cholesteryl benzoate (ChBz) were studied by dielectric and dynamic mechanical spectrometry. Dielectric data were fitted to the WLF equation. Using the C1C2 constants obtained for pure PVC, PVC+additive systems fitted well the WLF curve by an appropriate choice of reference temperature, T0. T0 of PVC+additives were lower than that of pure PVC. α- and β-peaks in PVC+additives occurred at temperatures lower than those in pure PVC. β-Peak intensities in DMA spectra decreased on adding Ch and ChBz. This may be ascribed to the possible specific interactions of C-Cl dipoles in PVC with OH from Ch or aromatic protons from ChBz. Such a suppression of β-peak is described as antiplasticization by earlier workers. The behaviour of these additives with PVC differed from that with poly(vinyl acetate) or poly(butyl methacrylate) due to differences in apparent enthalpy of activation (ΔHa) for the α-process.
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Deshpande, D., Tiwari, V. Dielectric and Dynamic Mechanical Behaviour of Poly(vinylchloride) Containing Small Amounts of Cholesterol, Cholesteryl Chloride, and Cholesteryl Benzoate. Polym J 15, 377–383 (1983). https://doi.org/10.1295/polymj.15.377
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DOI: https://doi.org/10.1295/polymj.15.377
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