Elucidating the role of interfacial hydrogen bonds on glass transition temperature change in a poly(vinyl alcohol)/SiO2 polymer-nanocomposite by noncovalent interaction characterization and atomistic molecular dynamics simulations

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Elucidating the role of interfacial hydrogen bonds on glass transition temperature change in a poly(vinyl alcohol)/SiO2 polymer-nanocomposite by noncovalent interaction characterization and atomistic molecular dynamics simulations
Title:
Elucidating the role of interfacial hydrogen bonds on glass transition temperature change in a poly(vinyl alcohol)/SiO2 polymer-nanocomposite by noncovalent interaction characterization and atomistic molecular dynamics simulations
Journal Title:
Macromolecular Rapid Communications
Publication Date:
11 September 2020
Citation:
Panigrahi, R.; Chakraborty, S.; Ye, J.; Lim, G. S.; Lim, F. C. H.; Yam, J. K. H.; Wu, L. Y. L.; Chng, S. Y.; Prawirasatya, M.; Herk, A. M. V.; Thoniyot, P., Elucidating the role of interfacial hydrogen bonds on glass transition temperature change in a poly(vinyl alcohol)/SiO2 polymer-nanocomposite by noncovalent interaction characterization and atomistic molecular dynamics simulations. Macromolecular Rapid Communications 2020, 41 (21), Article no.: 2000240, DOI: 10.1002/marc.202000240.
Abstract:
A thorough experimental investigation of polymer-glass transition temperature (Tg) is performed on poly(vinyl alcohol) (PVA) and fumed silica nanoparticle (SiNP) composite. This is done together with atomistic molecular dynamics simulations of PVA systems in contact with bare and fully hydroxylated silica. Experimentally, PVA-SiNP composites are prepared by simple solution casting from aqueous solutions followed by its characterization using Fourier-transform infrared spectroscopy (FTIR), dynamic mechanical analysis (DMA), and dynamic scanning calorimetry (DSC). Both theoretical and experimentally deduced Tg are correlated with the presence of hydrogen bonding interactions involving OH functionality present on the surface of SiNP and along PVA polymer backbone. Further deconvolution of FTIR data show that inter-molecular hydrogen bonding present between PVA and SiNP surface is directly responsible for the increase in Tg. SiNP filler and PVA matrix ratio is also optimized for a desired Tg increase. An optimal loading of SiNP exists, in order to yield the maximum Tg increase arising from the competition between hydrogen bonding and crowding effect of SiNP.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the Agency for Science, Technology and Research (A*STAR) - Environmentally Friendly Specialty Products Programme
Grant Reference no. : SERC152800043
Description:
This is the peer reviewed version of the following article: Panigrahi, R.; Chakraborty, S.; Ye, J.; Lim, G. S.; Lim, F. C. H.; Yam, J. K. H.; Wu, L. Y. L.; Chng, S. Y.; Prawirasatya, M.; Herk, A. M. V.; Thoniyot, P., Elucidating the role of interfacial hydrogen bonds on glass transition temperature change in a poly(vinyl alcohol)/SiO2 polymer-nanocomposite by noncovalent interaction characterization and atomistic molecular dynamics simulations. Macromolecular Rapid Communications 2020, 41 (21), Article no.: 2000240, DOI: 10.1002/marc.202000240, which has been published in final form at https://doi.org/10.1002/marc.202000240. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
ISSN:
1022-1336
1521-3927
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