Abstract
Gelatin (GA) is a natural protein widely used in food packaging, but its fabricated fibrous film has the defects of a high tendency to swell and inferior mechanical properties. In this work, a novel spinning technique, solution blow spinning (SBS), was used for the rapid fabrication of nanofiber materials; meanwhile, nylon 66 (PA66) was used to improve the mechanical properties and the ability to resist dissolution of gelatin films. Morphology observations show that GA/PA66 composite films had nano-diameter from 172.3 to 322.1 nm. Fourier transform infrared spectroscopy and X-ray indicate that GA and PA66 had strong interaction by hydrogen bonding. Mechanical tests show the elongation at break of the composite film increased substantially from 7.98% to 30.36%, and the tensile strength of the composite film increased from 0.03 MPa up to 1.42 MPa, which indicate that the composite films had the highest mechanical strength. Water vapor permeability analysis shows lower water vapor permeability of 9.93 g mm/m2 h kPa, indicates that GA/PA66 film’s water vapor barrier performance was improved. Solvent resistance analysis indicates that PA66 could effectively improve the ability of GA to resist dissolution. This work indicates that SBS has great promise for rapid preparation of nanofibrous film for food packaging, and PA66 can be applied to the modification of gelatin film.
Highlights
Solution blow spinning (SBS) is a rising preparation technique to produce polymer films with ultrafine fibers and high specific surface area [1]
The utilization of nanofiber film in food packaging is primarily manufactured by the electrospinning method [5,6,7,8,9]
It can be observed that the addition of PA66 resulted in a significant reduction in fiber diameter, creating a denser network structure, which could improve the water vapor barrier performance
Summary
Solution blow spinning (SBS) is a rising preparation technique to produce polymer films with ultrafine fibers and high specific surface area [1]. A regular SBS apparatus consists of a high velocity air source, a syringe pump, a concentric nozzle system, and a collector [2]. The polymer solution in the inner nozzle is elongated into fine fiber by the surrounding high velocity airflow in the outer nozzle. Because SBS uses high velocity airflow to form fibers, there is no requirement for the conductivity of the solution compared to electrospinning. The development of nanofiber films for food packaging using SBS, has undergone little research. The utilization of nanofiber film in food packaging is primarily manufactured by the electrospinning method [5,6,7,8,9]. Tandon et al [10]
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