Dopamine-Mediated Pre-Crosslinked Cellulose/Polyurethane BlockElastomer for the Preparation of Robust Biocomposites

摘要

The development of micro- and nanofibril celluloseto improve strength while reducing the side effects of toughness andwater resistance can benefit integrated polymer performance.Inspired by the interior microstructure of mussel byssus, thispaper proposed an efficient means of generating an active blockmicrofibrillated cellulose/polyurethane elastomer using an epoxymonomer as a pre-crosslinked agent with the addition of apoly(dopamine) layer. The block elastomer served as a multifunctional crosslinker, constructing a covalent network and interfacialhydrogen bonding that interlinked the elastomer with a soy proteinisolate (SPI) matrix. Compared with the pristine SPI film, theintroduction of the block elastomer induced remarkable improvements in tensile strength and toughness (146.7 and 102.1%,respectively). Additionally, the block elastomer was employed tofurther estimate its reinforcing effect in SPI resin modification, which also exhibited favorable water resistance and adhesionperformance. This strategy may provide a new approach for constructing superior elastomers to reinforce applicable biomasscomposites.