Layer-by-layer assembly of cationic guar gum, cellulose nanocrystals and hydroxypropyl methylcellulose based multilayered composite films

Abstract

Eco-friendly sustainable materials provide an appealing template to replace contemporary syntheticnonrenewable resource-based materials while maintaining the acceptable material properties to meet the performance requirements. Here, a layer-by-layer (LBL) self-assembly technique was used for fabricating multilayer composite lms using all bio-based polymers/polysaccharides, i.e. cationic guar gum (CGg), carboxylated cellulose nanocrystals (cCNCs) and hydroxypropyl methylcellulose (HPMC). A ve layered composite lm was fabricated by depositing polymeric layers as follows:CGg→cCNCs→HPMC→cCNCs→CGg. The structural analysis of CGg/cCNCs/HPMC multilayered composite lms indicated the existence of electrostatic interaction as well as H-bonding between polymeric layers that resulted in homogenous, dense and compact lm surface with improved smoothness and strength properties. As compared to pure CGg lm, the CGg/cCNCs/HPMC multilayered composite lms showed improved tensile strength (84.8% increment) and modulus (29.19% improvement). Importantly, the deposition of HPMC layer contributed in achieving multilayer composite lms with more exible behavior (46.55% improvement in elongation at break). Furthermore, owing to the high transparency (89.5% transmittance), appreciable gas and oil barrier performance and resistance to various solvents (e.g. acetone, THF and DMAc), these multilayer lms are promising candidates for various applications including renewable/sustainable packaging materials.

Efficient Synthesis of Quaternised Guar Gum using Tri‐alkylamine and Epichlorohydrin Condensate by Taguchi L9 Orthogonal Array

“…Among various cationic biopolymers, quaternized derivative of guar gum is reported as one of the most important derivatives that is used for diverse applications such as flocculant, [19,20] in-vitro drug release, [21] paper strengthening, [22] suspension stabilization, [23] hydrogel preparation, [24] multilayer [25] and nano-biocomposite [26] and bioadhesive [27] films, etc.…”

Humidity-Responsive Guar Gum Fibers by Wet Spinning

“…9 Guar gum (GG) is a highly branched straight-chain polysaccharide formed by galactose and mannose. 10 GG is a non-ionic polysaccharide, does not contain easily degradable groups, has no electrostatic shielding effect in aqueous solution, has less possibility of generating strong chemical bonding interactions with anions and cations, and is therefore highly tolerant to most monovalent salt ions (Na + , K + , Cl − , etc.). 11 The molecular structure of GG leads to high viscosity and high solubilization in aqueous solutions, which seriously impacts the material's mechanical properties and limits the research and application of GG.…”

“…11 The molecular structure of GG leads to high viscosity and high solubilization in aqueous solutions, which seriously impacts the material's mechanical properties and limits the research and application of GG. 10 However, the presence of branched galactose, which is located on the outer side of straight-chain polysaccharides, does not affect the activity of alcohol hydroxyl groups, which can form extensive intermolecular hydrogen bonding networks. 12 The presence of hydroxyl groups can serve as chelating sites for binding metal ions.…”

“…Guar gum (GG) is a highly branched straight-chain polysaccharide formed by galactose and mannose . GG is a non-ionic polysaccharide, does not contain easily degradable groups, has no electrostatic shielding effect in aqueous solution, has less possibility of generating strong chemical bonding interactions with anions and cations, and is therefore highly tolerant to most monovalent salt ions (Na + , K + , Cl – , etc.)…”