Dinesh, M. and Ranganathaiah, C. (2013) Microwave irradiation induced modifications on the interfaces in SAN/EVA/PVC and PVAc/BPA/PVP ternary polymer blends: Positron lifetime study. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 310. pp. 67-74. ISSN 0168-583X
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Ternary polymer blends of poly(styrene-co-acrylonitrile)/poly(ethylene-co- vinylacetate)/poly(vinyl chloride) (SAN/EVA/PVC) and poly(vinyl acetate)/bisphenol A/polyvinylpyrrolidone (PVAc/BPA/PVP) with different compositions have been prepared by solvent casting method and characterized by positron lifetime spectroscopy and differential scanning calorimetry DSC. Phase modifications have been induced by irradiating the blends with microwave radiation. These changes have been monitored by measuring the free-volume content in the blends. The results clearly show improved interactions between the constituent polymers of the blends upon microwave irradiation. However, the free-volume data and DSC measurements are found to be inadequate to reveal the changes at the interfaces and the interfaces determine the final properties of the blend. For this we have used hydrodynamic interaction (α ij ) approach developed by us to measure strength of hydrodynamic interaction at the interfaces. These results show that microwave irradiation stabilizes the interfaces if the blend contains strong polar groups. SAN/EVA/PVC blend shows an increased effective hydrodynamic interaction from -3.18 to -4.85 at composition 50/35/15 upon microwave irradiation and PVAc/BPA/PVP blend shows an increased effective hydrodynamic interaction from -3.81 to -7.57 at composition 20/50/30 after irradiation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Chlorine compounds, Differential scanning calorimetry, Free volume, Hydrodynamic interaction, Hydrodynamics, Polymer blends, Polyvinyl chlorides, Positron annihilation spectroscopy, Positron lifetime, Positron lifetime spectroscopy, Solvent casting method, Ethylene, Interfaces (materials), Poly(styrene-co-acrylonitrile), Styrene, Ternary polymer blends, Microwave irradiation, Positron lifetime study, Differential scanning calorimetry dsc |
| Subjects: | D Physical Science > Physics |
| Divisions: | Department of > Physics |
| Depositing User: | Arshiya Kousar Library Assistant |
| Date Deposited: | 17 Sep 2019 07:27 |
| Last Modified: | 17 Sep 2019 07:27 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/7993 |
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