Abstract
Synthetic polymers are the most commonly used polymers in daily life. Therefore, it is necessary to develop environmentally friendly polymers. Hydroxypropyl methylcellulose (HPMC) is a potential candidate for a biopolymer, owing to its unique properties. However, HPMC biopolymers have some disadvantages compared to synthetic polymers. In this study, the mechanical properties and tribological performance of MoS2 additive-enhanced cellulose matrix biocomposites were investigated in order to improve the properties of HPMC. MoS2 was incorporated into the HPMC matrix as a strengthening additive. The mechanical properties, bonding, and water vapor permeability of the composites were analyzed. The mechanical and vapor barrier properties of the HPMC films were significantly enhanced. The ultimate tensile strength and Young’s modulus of the composite films increased with the addition of up to 1 wt% MoS2. The water vapor permeability of HPMC films reduced when additives were incorporated. The wear test proves that the MoS2 additives can improve the tribological performance of the HPMC composite while reducing the friction coefficient. The main reason for enhanced tribological performance is the improvement in load capacity of the composite coating by the MoS2 additive. This MoS2/HPMC biocomposite can be used in food packaging.
Highlights
This study investigates the effects of molybdenum disulfide (MoS2 ) additives on mechanical properties and tribological behavior
The image shows that the additive and Hydroxypropyl methylcellulose (HPMC) matrix are in good condition and that there is no obvious particle agglomeration
The composite material is black in color, which means that the addition of MoS2 turns the originally transparent HPMC into black and can absorb a large amount of light, achieving the purpose of blocking light
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The development of new food packaging materials is necessary due to ecological demands. The basic need of future food packaging materials is decomposable materials, bio-friendly materials, low light penetration, excellent gas/moisture barrier properties, and appropriate mechanical properties. The intermolecular hydrogen bonds between the hydroxyl groups result in aggregates or crystalline forms of cellulose. HPMC biopolymers have some disadvantages compared to synthetic polymers such as poor tensile strength, elongation factor, and water vapor barrier performance. Several studies have used additives to improve the properties of HPMC [13,14]. This study investigates the effects of molybdenum disulfide (MoS2 ) additives on mechanical properties and tribological behavior. We studied the mechanical properties of HPMC polymer films with different molecular masses, the augmentative effects of MoS2 addition, and their mechanisms. The findings of this study can serve as a useful reference for the diversification of HPMC film applications
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