Flame-Retarded Poly (Lactic Acid) Containing Phosphating Chitosan

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Fire and Materials Pub Date : 2024-11-19 DOI:10.1002/fam.3256

Baochai Li, Huijuan Sun, Li Zhang, Xiaoya Zhao, Aznizam Abu Bakar, Zurina Mohamad

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引用次数: 0

Abstract

Poly (lactic acid) (PLA) is a promising thermoplastic aliphatic polyester to replace petroleum-based polymers in many fields. However, its flammability has limited its application in areas where fire safety is crucial. Chitosan (CS) is a type of natural alkaline polysaccharide with abundant content and good biocompatibility. In this study, a bio-based flame-retardant phosphating chitosan (PCS) was prepared and the effects of PCS on the flammability, mechanical and thermal properties of PLA were evaluated. The limiting oxygen index (LOI) of PLA/PCS blend containing 9 wt% PCS reached 28.9% which was relatively higher than LOI of pure PLA of 20% and passed UL-94 V-0 rating. PCS accelerated the carbonization of PLA matrix, and increased the char residue at 800°C. The combustion process was further investigated by cone calorimeter test, and the peak heat release rate and total heat release were significantly decreased. X-ray photoelectron spectrometer and thermogravimetric-infrared analysis were used to analyze the composition of char residue and pyrolysis products, which further confirmed that the flame-retardant mechanism of PCS was the combination of condensed phase and gas phase. However, the mechanical properties of PLA/PCS blend inevitably decreased with increasing of PCS content.

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来源期刊

Fire and Materials 工程技术-材料科学：综合

CiteScore

4.60

自引率

5.30%

发文量

审稿时长

3 months

期刊介绍： Fire and Materials is an international journal for scientific and technological communications directed at the fire properties of materials and the products into which they are made. This covers all aspects of the polymer field and the end uses where polymers find application; the important developments in the fields of natural products - wood and cellulosics; non-polymeric materials - metals and ceramics; as well as the chemistry and industrial applications of fire retardant chemicals. Contributions will be particularly welcomed on heat release; properties of combustion products - smoke opacity, toxicity and corrosivity; modelling and testing.