Phosphorus and Silicon Modified Alginate as an Efficient Flame Retardant for Poly(lactic acid)

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Macromolecular Materials and Engineering Pub Date : 2024-07-20 DOI:10.1002/mame.202400194

Kata Enikő Decsov, Viktória Cserni, Beáta Szolnoki, Olga Krafcsik, Katalin Bocz

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引用次数: 0

Abstract

The introduction of biobased carbon sources in intumescent flame retardant formulations is extensively explored, particularly for biopolymers such as poly(lactic acid) (PLA). In this work, the flame retardant efficiency of alginate, a favorable renewable charring agent candidate, is enhanced by chemical modification with a phosphorus‐ and silicon‐containing compound and subsequent coagulation in the presence of Ca2+ ions. The simultaneous presence of P and Si atoms in the reactive compound is shown to be an effective way to avoid thermal stability issues related to the biobased carbohydrate. The newly synthesized PSilAlg additive boosts the flame‐retardant effectiveness of ammonium‐polyphosphate (APP) at low loadings. Adding 5 wt% PSilAlg to 15 wt% APP containing PLA composite increases the limiting oxygen index from 26.0 to 34.0 vol% and decreases the total heat emission during combustion by 46%, accompanied by significantly (by 66%) reduced smoke production. The outstanding flame retardant performance of PSilAlg is attributed to the high amount and thermally stable carbonaceous fire‐protecting layer that forms as a result of the enhanced charring, catalyzed by the high oxidation state P, and the strengthening mechanism of inorganic silicates and calcium salts.

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磷和硅改性藻酸盐作为聚乳酸的高效阻燃剂

在膨胀型阻燃剂配方中引入生物基碳源已得到广泛探索，尤其是聚乳酸（PLA）等生物聚合物。在这项研究中，通过使用含磷和硅的化合物对海藻酸盐进行化学改性，并随后在 Ca2+ 离子存在下进行凝结，提高了海藻酸盐（一种理想的可再生炭化剂候选材料）的阻燃效率。活性化合物中同时存在 P 原子和 Si 原子被证明是避免与生物基碳水化合物相关的热稳定性问题的有效方法。新合成的 PSilAlg 添加剂可在低添加量下提高聚磷酸铵（APP）的阻燃效果。在含有 15 wt% APP 的聚乳酸复合材料中添加 5 wt% PSilAlg，可将极限氧指数从 26.0 Vol% 提高到 34.0 Vol%，并将燃烧过程中的总热量排放降低 46%，同时显著减少烟雾产生（66%）。PSilAlg 的出色阻燃性能归功于高氧化态 P 催化的炭化增强以及无机硅酸盐和钙盐的强化机制所形成的高含量和热稳定性碳质防火层。

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来源期刊

Macromolecular Materials and Engineering 工程技术-材料科学：综合

CiteScore

7.30

自引率

5.10%

发文量

328

审稿时长

1.6 months

期刊介绍： Macromolecular Materials and Engineering is the high-quality polymer science journal dedicated to the design, modification, characterization, and processing of advanced polymeric materials.