Impact of diisobutyl aluminum hypophosphite on flame-retarded thermoplastic polyester elastomers composites and its mechanism

IF 3.6 4区工程技术 Q2 CHEMISTRY, APPLIED

Journal of Vinyl & Additive Technology Pub Date : 2025-03-18 DOI:10.1002/vnl.22214

Ming Yang, Yushu Xiang, Zitao Zhang, JinChuan Zhang, Min He, Shuhao Qin, Jie Yu

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引用次数: 0

Abstract

Thermoplastic polyester elastomer (TPEE) is widely used in industries such as healthcare, electronics and electrical appliances, wire and cable sheathing, and automobiles due to its excellent comprehensive properties. However, the extreme flammability significantly restricts its practical applications and further development. To address this issue, an additive, aluminum diisobutylaluminium hypophosphite (APBA), was introduced into TPEE as the flame retardant. The results showed that the limiting oxygen index (LOI) of the TPEE composite with 17.5 wt% APBA was increased from 17.5% (pure TPEE) to 33.8%, and the corresponding vertical combustion grade (UL-94) reached V-0 level. In addition, the TPEE/APBA composite materials exhibit relatively good mechanical and electrical insulation properties. The tensile strength was maintained at 10.57 MPa, and volume resistivity increased by 491.47%. According to the result of the gas–solid phase products analysis of the composite, the quenching effect of phosphorus-containing free radicals resulting from APBA was confirmed. Meanwhile, the addition of APBA promoted the formation of a stable, dense, and smooth carbon layer composed of aluminum-containing polyphosphate and graphite structure, thus isolating the oxygen and heat transfer.

Highlights

TPEE/APBA (17.5 wt%) composite achieved a UL-94 V-0 rating with a high LOI of 33.8%.
APBA played dual functions in gas and condensed phases as a flame retardant for TPEE.
The flame-retardant mechanism of TPEE/APBA was elucidated.

Abstract Image

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次磷酸二异丁基铝对阻燃热塑性聚酯弹性体复合材料的影响及其机理

热塑性聚酯弹性体（TPEE）因其优异的综合性能被广泛应用于医疗保健、电子电器、电线电缆护套、汽车等行业。然而，其极强的可燃性极大地限制了其实际应用和进一步发展。为了解决这一问题，在TPEE中引入了添加剂二异丁基次磷酸铝（APBA）作为阻燃剂。结果表明，添加17.5 wt% APBA的TPEE复合材料的极限氧指数（LOI）由17.5%（纯TPEE）提高到33.8%，其垂直燃烧等级（UL-94）达到V-0水平。此外，TPEE/APBA复合材料具有较好的机械和电绝缘性能。拉伸强度保持在10.57 MPa，体积电阻率提高491.47%。根据复合材料的气固相分析结果，证实了APBA对含磷自由基的猝灭作用。同时，APBA的加入促进了由含铝聚磷酸盐和石墨结构组成的稳定、致密、光滑的碳层的形成，从而隔离了氧气和热量的传递。TPEE/APBA复合材料（17.5 wt%）达到UL-94 V-0等级，LOI高达33.8%。作为TPEE的阻燃剂，APBA在气相和凝聚相中具有双重作用。阐述了TPEE/APBA的阻燃机理。

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来源期刊

Journal of Vinyl & Additive Technology 工程技术-材料科学：纺织

CiteScore

5.40

自引率

14.80%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.