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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含磷化壳聚糖的阻燃聚乳酸

聚乳酸（PLA）是一种很有前途的热塑性脂肪族聚酯，可以在许多领域取代石油基聚合物。然而，它的可燃性限制了它在消防安全至关重要的领域的应用。壳聚糖（CS）是一种含量丰富、生物相容性好的天然碱性多糖。本研究制备了一种生物基阻燃磷化壳聚糖（PCS），并研究了PCS对聚乳酸（PLA）的可燃性、力学性能和热性能的影响。含9wt % PCS的PLA/PCS共混物的极限氧指数（LOI）达到28.9%，相对高于纯PLA的20%，达到UL-94 V-0等级。在800℃时，聚乳酸加速了聚乳酸基体的碳化，增加了焦渣。通过锥形量热仪对燃烧过程进行了进一步研究，发现峰值放热率和总放热率均显著降低。利用x射线光电子能谱仪和热重-红外分析对炭渣和热解产物的组成进行了分析，进一步证实了PCS的阻燃机理为缩合相和气相结合。但随着PCS含量的增加，PLA/PCS共混物的力学性能不可避免地下降。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.