Chitosan/Phytic Acid Polyelectrolyte Complex: A Green and Renewable Intumescent Flame Retardant System for Ethylene–Vinyl Acetate Copolymer

Abstract

We describe the preparation and characterization of a green and renewable polyelectrolyte complex (PEC) containing phosphorus, nitrogen and carbon elements, based on the ionic complexation between chitosan and phytic acid. Introduction of this PEC to ethylene−vinyl acetate copolymer (EVA) leads to an improvement of the flame retardancy. As for the EVA/PEC composites with 20.0 wt % of PEC (EVA/20PEC), the char residue at 600°C is 12 wt % higher than that of the pristine EVA under nitrogen atmosphere. Compared to the pristine EVA, the peak heat release rate and total heat release of EVA/20PEC show 249 W g −1 and 5.6 kJ g −1 decreases, respectively. The char residue of EVA/20PEC is full and compact, demonstrating excellent intumescent effect. Introduction of this PEC also contributes to a slight increase of the Young's modulus while maintains the excellent ductility. This work provides a new approach for the development of environmentally friendly intumescent flame retardant system.

Metallic phytates as efficient bio-based phosphorous flame retardant additives for poly(lactic acid)

“…The objective of this work is to study the effect of different metallic phytate salts as biosourced phosphorous flame retardant additives for PLA. Few studies reported the use of phytic acid or salts in combination with other flame retardant additives [42][43][44][45][46] but not as a unique FR agent. The literature on this subject is very limited.…”

Understanding the oxygen barrier property of highly transparent poly(lactic acid)/benzoxazine composite film by analyzing the UV‐shielding performance

“…As shown in Figure , the XRD pattern of PLA shows typical peaks at around 14.1°, 17.1°, 18.6°, and 25.7°, respectively, which are ascribed to the α‐form crystals . In the case of BOZ, there are two broad peaks over the range of 5°–30°, demonstrating its amorphous structure . After adding BOZ to PLA, little changes in diffraction intensity can be found for the four typical peaks of PLA.…”

The Innovation Research of Biodegradable Polymers for Sustainable Packaging

“…Chitosan (CS) is a linear aminopolysaccharide derived from chitin, a major component of insects and crustacean shells [26]. Tao Zhang et al [27] designed a novel CS based polyelectrolyte complex (PEC) containing phosphorus, nitrogen and carbon elements.…”