Abstract Polylactic acid (PLA) is a new type of biodegradable material with good mechanical properties, and is widely used in many fields. However, as PLA is highly flammable, it is necessary to conduct flame‐retardant modification research on PLA. Phosphorus heterophilic flame retardants are low smoke, non‐toxic and have high flame‐retardant efficiency, and also have broad application prospects. In this study, a phosphazene flame retardant, 9,10‐dihydro‐9‐oxa‐10‐phosphazene‐10‐yl‐hydroxy‐phenol (abbreviated as DOPO‐PHBA), was synthesized. The PLA/ECE/DOPO‐PHBA flame‐retardant composites were prepared by adding DOPO‐PHBA and epoxy chain extender (ECE) into PLA. Thermal, mechanical, and flame‐retardant properties, as well as microscopic morphology of the PLA flame‐retardant composites were characterized and analyzed, and the flame‐retardant mechanism was discussed. Results show that when the flame‐retardant DOPO‐PHBA is added at 5 wt%, the PLA composites can reach the V‐0 level of combustion, and the corresponding LOI value is 30.0% at this time, and the LOI value increases from 22.5% to 33.6% with the increase of the flame‐retardant content. In addition, PLA composites still have good mechanical properties, and the cone heat, carbon residue and the thermal decomposition process shows that the flame‐retardant causes a two‐phase flame‐retardant mechanism on PLA with the gas and condensed phases acting in synergy. High flame retardancy is mainly attributed to free radical quenching, gas dilution, and the thermal barrier caused by the carbon layer. This work provides a simple and scalable method for the preparation of high‐performance flame‐retardant PLA materials.

Meng Pei

Ke Wei

Daohai Zhang

Shuhao Qin

Polymer Engineering and Science

30 多年来，POLYMER ENGINEERING & SCIENCE 一直是该领域最受推崇的期刊之一，是聚合物科学和技术前沿论文作者的论坛。 PE&S 的重要性体现在其文章被引用的频率上，尤其是被其他出版物引用的频率——实际上每年数千次。世界各地的工程师、研究人员、技术人员和院士都在向 PE&S 寻求他们需要的宝贵信息。特刊由特邀客座编辑编撰。其中包含关于聚合物混合物、塑料力学和聚合物焊接等不同主题的专题讨论会。

POLYMER ENGINEERING & SCIENCE has been one of the most respected journals in the field of polymer science and technology for over 30 years. It serves as a vital platform for authors of cutting-edge papers in polymer science and technology, with articles being cited frequently, particularly by other publications—amounting to thousands of citations each year. Engineers, researchers, technicians, and scholars from around the world turn to POLYMER ENGINEERING & SCIENCE for the valuable information they need. Special issues are curated by invited guest editors and include thematic discussions on various topics such as polymer blends, plastic mechanics, and polymer welding.

POLYMER ENGINEERING & SCIENCE（聚合物工程与科学）是聚合物科学与技术领域最受尊敬的期刊之一，已有30多年历史。该期刊为聚合物科学和技术的前沿研究提供了一个重要的平台，发表的论文被广泛引用，尤其是被其他出版物引用的频率，每年达到数千次。来自全球的工程师、研究人员、技术人员和学者都在向POLYMER ENGINEERING & SCIENCE寻求宝贵的信息。特刊由特邀客座编辑编撰，涵盖聚合物混合物、塑料力学和聚合物焊接等多个主题的专题讨论。

Category	Quartile
工程技术	4
工程技术, 工程化工	3
工程技术, 高分子科学	3

Polylactic acid flame‐retardant composite preparation and investigation of flame‐retardant characteristics

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