Clusters of starch‐g‐PCL and their effect on the physicochemical properties of films

Abstract

Starch-g-PCL films were prepared using the casting method and were characterized by different instrumental techniques and physicochemical properties. Nuclear magnetic resonance and Fourier transform infrared spectroscopy led to the proposal of a chemical structure for the films. The scanning electron microscopy (SEM) images of the films showed the formation of clusters of the graft copolymer starch-g-PCL. The effects of these clusters on the crystallinity (X-ray powder diffraction) revealed that the crystalline zones of the films increased by 46% and the elongation percentage increased by up to 50%. Also, the chemical degradation (aqueous hydrolysis) and the soil degradation of these films were 1.9 and 2.6 times faster than the films of starch alone. However, the thermal degradation temperature of the films decreased by more than 15°C, the moisture content decreased to 6.5%, and the water vapor permeation values increased in the films that contained starch-g-PCL. These results were accentuated with the increase in the amount of starch-g-PCL clusters.

Efect of sodium dodecyl sulfate on the physical properties of gelatin/multi-walled carbon nanotubes solutions and films

“…Undegradable plastic residues accumulation, have caused environmental pollution problems, giving place to research on new biodegradable materials, with functional properties similar to synthetic plastics. Several studies on production of films or coatings, using different biopolymers, such as polysaccharides, lipids and proteins have been undertaken successfully (Martucci and Ruseckaite, 2010;Ramírez-Hernández et al, 2015). Natural biopolymers have the advantage of being biodegradable, renewable and in many cases, edible.…”

Synthesis and Some Physico‐Chemical Properties of Novel Starch‐g‐poly(citronellyl acrylate) Copolymers

“…The copolymers of carbohydrate polymers, e.g., starch, cellulose, dextran, carboxymethylcellulose, lignocellulose, alginate, chitosan, etc. and various structure vinyl monomers, e.g., styrene, methacrylates, acrylates can be synthesized . In addition, the graft copolymers of synthetic polymers such as (poly(chloroethyl vinyl ether)‐g‐polystyrene)comb‐b‐(poly(chloropyran ethoxy vinyl ether)‐g‐polyisoprene)comb, (meth)acrylate copolymer grafted with long fluorinated side chain, Nylon 6‐g‐poly(acrylic acid), polyethylene‐g‐poly(acrylic acid), polyaniline‐g‐(sulfonated polyurethane), poly(N‐vinylpyrrolidinone‐g‐styrene), etc.…”

“…are also reported . Depending on the chemical structure of reagents, more hydrophobic or more hydrophilic type graft copolymers than initial polymeric materials can be prepared …”