Abstract
A series of composite films were prepared using poly(vinyl alcohol) (PVA) and xylan as degradable raw materials under the addition of glycerol and ammonium zirconium carbonate (AZC). The influences of AZC on the mechanical properties, water‐resisting properties, thermal stability, solubility (S), and water vapor permeability of PVA/xylan composite films were comparatively discussed. The results showed that AZC had a positive impact on improving the water resistance and mechanical properties of composite films especially for elongation at break (EAB). With increasing the AZC amounts from 0% to 15%, EAB increased rapidly from 18.5% to 218.0%, and the S values decrease from 11.64% to 8.64%. When the AZC amount reached 15%, the tensile strength still performed well (22.10 MPa). The great compatibility of components in composite films was also observed. Moreover, the addition of AZC had great influences on the thermal stability of composite films and the degradation in soil.
Highlights
Because of the availability at the relatively low cost and the good mechanical performance, petrochemical-based plastics have been widely used in the food packaging industry and the agricultural field, while they are mostly nonbiodegradable [1]
The addition of ammonium zirconium carbonate (AZC) led to a significant improvement in elongation at break (EAB) of composite films
EAB increased rapidly from approximately 18.5% to 218.0% with increasing the amount of the AZC from 0% to 15%
Summary
Because of the availability at the relatively low cost and the good mechanical performance, petrochemical-based plastics have been widely used in the food packaging industry and the agricultural field, while they are mostly nonbiodegradable [1]. Even though there are various reports on the films made of natural biopolymers, studies on xylan films have been limited because the pure xylan performed a poor film-forming ability [3]. Cellulose nanofibers (CNFs) were incorporated into xylan films to enhance the mechanical properties of xylan-based films [6]. The addition of 5 wt% CNF could increase the tensile stress and Young’s modulus of composite film by 30 and 80%, respectively. Poly(vinyl alcohol) (PVA) could remarkably improve the mechanical properties of xylan films. The addition of urea in PVA/xylan composite films improved the water resistance property. Another method to improve the film-forming ability of xylan was to modify xylan. The films prepared from carboxymethyl xylan (CMX) were examined for mechanical properties and their
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