From Cellulose in Straw to Transparent High-strength Films
Petroleum-based plastics can cause serious environmental problems such as"microplastics",and common biobased plastics are generally expensive and produced by complex processes.It is thus urgent to develop new biobased materials that are inexpensive,simple to prepare,and possess superior properties.In this work,we used agricultural waste straw bark as raw material,and fabricated microfiber films(SC films)with varied thicknesses by simple hot pressing.Then,cellulose-epoxy films(SC-Ep films)were obtained by pressure casting of epoxy resin into microfiber films.Scanning electron microscopy(SEM),Fourier transform infrared spectrometer(FTIR),and ultraviolet-visible spectrophotometer(UV-Vis)were used to characterize SC and composite SC4-Ep1 films.In addition,their mechanical properties,water resistance,thermal stability,organic solvent stability,and barrier property were investigated.The results showed that the optimal film(SC4-Ep1 films)presented a transmittance as high as 87％and outstanding mechanical strength(tensile stress up to 83.4％,Young's modulus 5.41 GPa)that is much higher than those of similar types plastic materials in the literature as well as in the market.In addition,the water vapor transmission rate was significantly reduced by 75.12％from SC4 films)to SC4-Ep1 films composite film,exhibiting superior barrier property.SC4-Ep1 films also displayed excellent stability in water and various organic solvents.This work provides a new approach to the preparation of composite bio-based films as well as bioplastic products.
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