In this paper, corn straw nanofibrillated-cellulose (NFC) was used to prepare a composite membrane, which not only realized the utilization of corn straw resources, but also alleviated the “white pollution” to a certain extent, and broadened the application way of degradable composite membrane. Corn straw nanofibrillated-cellulose, sodium alginate, and sodium carboxymethyl cellulose were used as the film-forming substrate, supplemented by montmorillonite to optimize its performance, glycerin was a plasticizer, essential oils and stearic acid were modifiers. The composite film was prepared by the casting method, and the performance of the composite film was measured by single factor and orthogonal experiments. The influences of each film-forming material on the mechanical properties, moisture permeability, light transmittance, and water solubility of the film were investigated. The optimal formula combination of the film-forming liquid was determined as follows: montillonite of 20 g/L, nanofibrillated-cellulose of 30 g/L, essential oil of 2 mL/L, and the mass ratio of sodium alginate to carboxymethyl cellulose was 4∶1. The composite membrane prepared under this process condition had the best comprehensive effect, and its performance indexes were as follows: the film thickness was (0.072±0.03) mm, the tensile strength was 18.20 MPa, the elongation at break was 56.66%, the moisture permeability was 424.30 g/(m2·d), the light transmittance was 87.2%, and the hydrolysis time was 135 s. The composite film had excellent process performance and achieved the advantages of green degradation. With the increase of nanofibrillated-cellulose content, the tensile strength of the composite film increased, and the water vapor transmittance decreased gradually, which further optimized the process performance of the composite film, making the composite film more suitable for the demand of packaging materials in the market and broadening the market application prospect.
SONG Ting
,
ZHANG Liyuan
,
YU Runzhong
. Preparation and properties of corn straw nano-cellulose composite membrane[J]. Food and Fermentation Industries, 2023
, 49(21)
: 137
-144
.
DOI: 10.13995/j.cnki.11-1802/ts.030849
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