Improvement of Interfacial Adhesion by Bio-Inspired Catechol-Functionalized Soy Protein with Versatile Reactivity: Preparation of Fully Utilizable Soy-Based Film.

Zhong Wang,Shifeng Zhang,Wei Zhang,Jianzhang Li,Haijiao Kang

doi:10.3390/polym9030095

Zhong Wang, Shifeng Zhang + Show 3 more

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https://doi.org/10.3390/polym9030095

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Journal: Polymers	Publication Date: Mar 7, 2017
Citations: 18	License type: CC BY 4.0

Affiliation: Beijing Forestry University

Abstract

The development of materials based on renewable resources with enhanced mechanical and physicochemical properties is hampered by the abundance of hydrophilic groups because of their structural instability. Bio-inspired from the strong adhesion ability of mussel proteins, renewable and robust soy-based composite films were fabricated from two soybean-derived industrial materials: soluble soybean polysaccharide (SSPS) and catechol-functionalized soy protein isolate (SPI-CH). The conjugation of SPI with multiple catechol moieties as a versatile adhesive component for SSPS matrix efficiently improved the interfacial adhesion between each segment of biopolymer. The biomimetic adherent catechol moieties were successfully bonded in the polymeric network based on catechol crosslinking chemistry through simple oxidative coupling and/or coordinative interaction. A combination of H-bonding, strong adhesion between the SPI-CH conjugation and SSPS matrix resulted in remarkable enhancements for mechanical properties. It was found that the tensile strength and Young’s modulus was improved from 2.80 and 17.24 MPa of unmodified SP film to 4.04 and 97.22 MPa of modified one, respectively. More importantly, the resultant films exhibited favorable water resistance and gas (water vapor) barrier performances. The results suggested that the promising way improved the phase adhesion of graft copolymers using catechol-functionalized polymers as versatile adhesive components.

Highlights

Because of the hydrophilic nature and strong molecular interactions, soy protein isolate (SPI) films are highly sensitive to moisture, and their tensile properties cannot warrant their practical applications
We found that the SPC film crystallinity of soluble soybean polysaccharide (SSPS) crystallites by multiple interactions between the SPI-CH and SSPS matrix
The fully soy-derived, highly biocompatible, and bio-inspired soy-based composite films based on catechol-conjugated SPI and SSPS were developed

Summary

Introduction

Various biopolymers from different biorenewable resources have been used to develop biobased materials, including proteins, polysaccharides, oils and lipids, and biogenic polyesters [3,4]. Among these biopolymers, soy protein isolate (SPI) derived from the most abundant plant proteins are considered ideal candidates for fabricating eco-friendly biomaterials owing to its superiorities of low cost, biocompatibility, functional side chains, and processing properties [5,6]. More practical applications have taken advantage of the inherent properties of SPI with multi-functionality, which has been widely developed upon modification for use as a promising active packaging systems over the last decade [2,6]. Because of the hydrophilic nature and strong molecular interactions, SPI films are highly sensitive to moisture, and their tensile properties cannot warrant their practical applications

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