Water governs the mechanical properties of poly(vinyl alcohol)

Li, Lujuan and Xu, Xiaodong and Liu, Lei and Song, Pingan ORCID: https://orcid.org/0000-0003-1082-652X and Cao, Qianqian and Xu, Zhiguang and Fang, Zhengping and Wang, Hao (2021) Water governs the mechanical properties of poly(vinyl alcohol). Polymer, 213:123330. pp. 1-12. ISSN 0032-3861


Abstract

The presence of water molecules can significantly determine the macroscopic mechanical property and microscopic chain dynamics of poly(vinyl alcohol) (PVA). However, to date it has remained fully understood the molecular mechanism behind experimentally and theoretically. Herein, we systematically examine the effect of water contents on the mechanical property, glass transition, free volume, and intermolecular interactions by combining experimental and MD simulation. Our results show that the presence of water significantly reduces the mechanical strength of PVA, and only 1.8 wt% of water reduces the tensile strength by ~32% but notably increases the plasticity of PVA by ~2.5 times. Meanwhile, the inclusion of water remarkably lowers the glass transition temperature, increases free volume, and promotes the relaxation and mobility of PVA chains. This is mainly because the presence of water gives rise to both the plasticization and even lubricating effect on the PVA chains. This work unravels how water governs the mechanical performances of the PVA.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 25 Nov 2021 01:36
Last Modified: 01 Dec 2021 01:59
Uncontrolled Keywords: Polyvinyl alcohol; Water contents; Hydrogen bonding; Mechanical property; Molecular simulation
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030307 Theory and Design of Materials
09 Engineering > 0912 Materials Engineering > 091209 Polymers and Plastics
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401609 Polymers and plastics
34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340309 Theory and design of materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280105 Expanding knowledge in the chemical sciences
Funding Details:
Identification Number or DOI: https://doi.org/10.1016/j.polymer.2020.123330
URI: http://eprints.usq.edu.au/id/eprint/44043

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