Thiol‐assisted bioinspired deposition of polyurethane onto cellulose as robust elastomer for reinforcing soy protein‐based composites

The development of natural fiber‐reinforced composites is environmentally friendly and therefore presents great potential; however, these composites are characterized by poor water resistance and interfacial bonding, which therefore limits its practical applications. This study reported a facile and...

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Bibliographic Details
Published in:Journal of applied polymer science 2020-10, Vol.137 (39), p.n/a
Main Authors: Yan, Qian, Zhao, Shujun, Kang, Haijiao, Zhang, Shifeng
Format: Article
Language:English
Subjects:
adhesives
biopolymers and renewable polymers
Cellulose
Crosslinking
Dopamine
Elastomers
grafting
Infrared analysis
Interfacial bonding
Materials science
Optimization
Photoelectrons
Polymer matrix composites
Polymers
Polyurethane resins
Proteins
resins
Shear strength
Spectrum analysis
thermal properties
Thermogravimetric analysis
Water resistance
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Summary:The development of natural fiber‐reinforced composites is environmentally friendly and therefore presents great potential; however, these composites are characterized by poor water resistance and interfacial bonding, which therefore limits its practical applications. This study reported a facile and novel approach for the construction of a high‐performance microfibrillated cellulose (MFC) elastomer using thiol‐functionalized polyurethane (PU‐SH) with the assistance of a bioinspired dopamine platform. This elastomer was then employed as a reactive reinforcer to improve soy protein isolated (SPI) adhesive. The surface modification of MFC included the formation of a polydopamine (PDA) layer and Michael addition reactions between PU‐SH and PDA, which were characterized by the Fourier‐transform infrared spectroscopy, thermogravimetric analysis, and X‐ray photoelectron spectroscopy measurements. It was found that the high‐functional MFC elastomer served as a reactive cross‐linker that gave rise to multiple physical and chemical interactions with the SPI matrix. This resulted in the optimization of the crosslinking system, which ultimately contributed to the solution of the bottleneck issues for natural fiber‐reinforced composites. Consequently, the modified SPI‐based adhesives notably enhanced the shear strength to 1.38 MPa, displaying a 236.6% increment compared to the unmodified adhesive. This strategy may provide a new insight into the design and preparation of superior natural plant‐reinforced composites.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.49176