Facile synthesis of novel soy protein-based flame retardant and its effects on the flame retardancy and biodegradation of polylactic acid

IF 6.3 2区化学 Q1 POLYMER SCIENCE Polymer Degradation and Stability Pub Date : 2024-11-17 DOI:10.1016/j.polymdegradstab.2024.111093

Yuting Xue , Dongfang Zhao , Luqian Dong , Ruobing Yao , Fang Xu , Yunxuan Weng

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Abstract

A novel soy protein-based phosphonate flame retardant (SPPU) was synthesized by a facile two-step method for PLA. And the flame-retardant PLA/SPPU composites were prepared by melt blending. From the results, 3 wt.% of SPPU could increase the limiting oxygen index (LOI) value of PLA from 19.4 % to 23.4 %, and reach V-0 grade in UL-94 vertical combustion test. In the cone calorimetric tests, the heat release rate (HRR) and total heat release (THR) of PLA/SPPU decreased significantly. The results of TG and TG-IR of PLA/SPPU, FTIR and XPS of the char residual showed that SPPU mainly exerted flame retardant effects in the gas phase, accompanied by some effects in condensed phase. Besides, SPPU could accelerate the biodegradation of PLA under compost conditions, which increased the biodegradation rate of PLA from 86.2 % to 88.39 % in 180 days. The addition of appropriate content of SPPU would not cause the deterioration of mechanical properties of PLA, but can improve the toughness of PLA.

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新型大豆蛋白基阻燃剂的简易合成及其对聚乳酸阻燃性和生物降解的影响

采用简便的两步法合成了一种新型大豆蛋白基膦酸盐阻燃剂（SPPU）。通过熔融混合制备了阻燃聚乳酸/SPPU 复合材料。结果表明，3 wt.%的SPPU可将聚乳酸的极限氧指数（LOI）值从19.4%提高到23.4%，在UL-94垂直燃烧测试中达到V-0级。在锥形量热试验中，聚乳酸/SPPU 的热释放率（HRR）和总热释放率（THR）明显下降。聚乳酸/SPPU的TG和TG-IR、残炭的傅立叶变换红外光谱和XPS结果表明，SPPU主要在气相中发挥阻燃作用，在凝结相中也有一定作用。此外，在堆肥条件下，SPPU 还能加速聚乳酸的生物降解，180 天内聚乳酸的生物降解率从 86.2% 提高到 88.39%。添加适当含量的 SPPU 不会导致聚乳酸的机械性能下降，反而能提高聚乳酸的韧性。

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.