Impact of Magnesium Salt on the Mechanical and Thermal Properties of Poly(vinyl alcohol).

Riza Asmaa Saari,Muhammad Shahrulnizam Nasri,Masayuki Yamaguchi,Takumitsu Kida

doi:10.3390/polym13213760

Riza Asmaa Saari, Muhammad Shahrulnizam Nasri + Show 2 more

Open Access

https://doi.org/10.3390/polym13213760

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Journal: Polymers	Publication Date: Oct 30, 2021
Citations: 3	License type: CC BY 4.0

Affiliation: Japan Advanced Institute of Science and Technology

Abstract

The effects of magnesium salts with various anion species on the structure and properties of a poly(vinyl alcohol) (PVA) film were studied. The glass transition temperature of the PVA film increased following the addition of a magnesium salt. Furthermore, the salt greatly enhanced the modulus and yield stress and reduced the crystallinity of the film. These effects were attributed to the strong ion–dipole interactions between the magnesium salts and the PVA chains. The strength of interaction, i.e., the reduction of segmental motions, depended on the anion species in the following order: Mg(ClO4)2, MgBr2, MgCl2, Mg(CH3COO)2, and MgSO4. The order corresponded to the Hofmeister series, which predicts the ability to break the structure of water.

Highlights

Poly(vinyl alcohol) (PVA) is an interesting synthetic biodegradable polymer
Its advantageous mechanical properties mostly arise from its intermolecular hydrogen bonds and the small size of its hydroxyl groups, which allow the PVA chains to pack densely, especially in the glassy region
Further improvements to its mechanical properties will facilitate the use of PVA as an alternative to inorganic fibers such as those made from carbon, glass, or metal [7,8,9]

Summary

Introduction

Poly(vinyl alcohol) (PVA) is an interesting synthetic biodegradable polymer. It has many attractive properties including water solubility, gas barrier properties, and biocompatibility [1,2,3,4,5,6]. Its advantageous mechanical properties mostly arise from its intermolecular hydrogen bonds and the small size of its hydroxyl groups, which allow the PVA chains to pack densely, especially in the glassy region. This is important for a high-modulus fiber. An enhanced modulus is attractive for film applications. One way to increase the modulus is to enhance interactions with a salt, i.e., to introduce ion–dipole interactions

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