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https://idr.nitk.ac.in/jspui/handle/123456789/16345
Title: | Influence of glutaraldehyde on dynamic properties of poly(vinyl alcohol) polymer |
Authors: | Kumar G. C. Mohan; Jeyaraj P.; Nagamadhu M. |
Issue Date: | 2020 |
Citation: | EMERGING MATERIALS RESEARCH Vol. 9 , 1 , p. 168 - 179 |
Abstract: | This study investigated the dynamic mechanical properties of poly(vinyl alcohol) (PVA; (CH2CH(OH))(n)) cross-linked with glutaraldehyde (GA; OHC(CH2)(3)CHO). The cross-linked polymer was prepared by using a conventional casting technique and then treated with sulfuric acid (H2SO4) for 24 h. The flexural properties during static and dynamic modes were studied using a three-point bending condition. The static flexural properties are improved with the addition of 30% GA in PVA, with higher value of strain. It was observed that the dynamic mechanical properties of PVA improved significantly with an increase in cross-linking percentage. The storage and loss moduli increased drastically with the addition of the cross-linker up to 20%, and marginal changes occurred with further addition of the cross-linker. The fracture behavior was transformed from ductile to brittle for more than 20% cross-linker. Shifting of the rubber region and liquid region with higher temperatures was observed in storage and loss modulus plots. Improvement in the adhesion factor, cross-linking density and effectiveness was observed for GA up to 25%. The test duration was estimated using the Williams-Landel-Ferry model for different temperatures. The major changes were in the modulus in the rubbery plateau region. The cross-linked polymer had much greater storage and loss moduli, indicating a closer network structure and higher stiffness. |
URI: | https://doi.org/10.1680/jemmr.18.00059 http://idr.nitk.ac.in/jspui/handle/123456789/16345 |
Appears in Collections: | 1. Journal Articles |
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