Structure and Properties of Starch/Poly (vinyl alcohol) Film Modificated by Different Inorganic Salts

Abstract

In this paper, the regularity of different inorganic salts on the structure and properties of starch/ poly (vinyl alcohol) (PVA) film was studied. The effects of inorganic salts on the structure and properties of starch/PVA film were investigated by scanning election microscope, Fourier transform infrared spectroscopy, X‐ray diffraction, water content test, differential scanning calorimeter, thermogravimetric analysis and tensile test, respectively. The results showed that the plasticizing effect of inorganic salts on starch/PVA composite film was related to the valence and radius of ions. Compared with Li+ and Al3+, the incorporation of Mg2+ significantly improved the compatibility of starch/PVA composite films. Meanwhile, the ability of above three metal chloride salts to destroy the crystal structure of the starch/PVA composite film was essentially the same. When the cation was the same, the effect of inorganic salt containing Cl− on the compatibility of starch/PVA composite film and the destruction of the crystalline structure of starch/PVA composite film were greater than that of NO3−. Among all prepared samples, the magnesium chloride modified starch/PVA composite film has the highest elongation at break and the best flexibility.

Metal Organic Frameworks Derived Sustainable Polyvinyl Alcohol/Starch Nanocomposite Films as Robust Materials for Packaging Applications

“…The solutions were stirred at 80 °C for 2 h and were subsequently mixed and stirred for another 2 h at the same temperature. A total 5–6 drops of glutaraldehyde for cross-linking and glycerin as a plasticizer were also added to the film at this stage [ 27 ]. Finally, the ZIF-67 was added to the resultant mixture with different wt.% according to the amount of PVA as shown in Table 1 .…”

Structural Optimization of Sorghum Straw Powder/ZnO/PVA Nanocomposite Films

“…Besides wasting sorghum straw resources, this practice also threatens the ecological environment. The key to the rational utilization and improvement of the comprehensive values of sorghum straw lies in the study of its energy and industrial utilization technology [1].…”

Development of poly(vinyl alcohol)/starch/ethyl lauroyl arginate blend films with enhanced antimicrobial and physical properties for active packaging

“…In recent years, food packaging materials based on petroleum-based polymers have caused serious environmental issues, such as natural resource depletion, waste production and energy crisis contribution [1]. In response to the demand of environmental sustainability and the market trends, a lot of research has been devoted to the development of novel packaging materials based on biopolymers that are biodegradable and eco-friendly [2][3][4].…”

“…However, compared with conventional synthetic plastics, PVA has a relatively high price. Considerable efforts have been made to blend PVA with other renewable materials to fabricate composite materials with lower manufacturing cost [2,6]. Furthermore, novel PVA composites often possess superior performance and multiple functions to meet the new requirements of customers [9,10].…”