Preparation Process Optimization and Property Analysis of Nano-cellulose-Starch Film Based on Corn Stalk

Abstract

In this work, corn stalk nano-cellulose and corn stalk starch were used as film-forming substrates to prepare corn stalk nano-cellulose-starch film by blending-flow casting method. The properties of nano-cellulose-starch film were determined on the basis of single factor and orthogonal test. The effects of each material of film-forming on mechanical properties, moisture permeability, light transmittance, water solubility and oxygen permeability of nano-cellulose-starch film were investigated. Finally, the optimal formula combination of film-forming liquid was determined as follows: The starch was 10.0% (W/V), nano-cellulose was 5% (W/V), sodium carboxymethyl cellulose was 1.6% (W/V) and glycerol was 2.3% (V/V). Under optimal conditions, the nano-cellulose-starch film has the best comprehensive effect. The performance indexes were measured, and the membrane thickness was (0.063±0.050) mm, tensile strength was 14.92 MPa, elongation at break was 64.75%, moisture permeability coefficient was 2.19×10−12 g·m/m2·s·Pa, light transmittance was 87.60%, hydrolysis time was 97.00 s, oxygen permeability was 2.75×10−14 cm3·cm/cm2·s·Pa.

Keywords

• corn straw nano-cellulose (csnc)
• corn straw starch (css)
• csnc-css film
• mechanical properties
• moisture permeability coefficient