Green and economic flame retardant prepared by the one-step method for polylactic acid

Hongyan Cheng; Yincai Wu; Wayne Hsu; Fenglong Lin; Shenglong Wang; Junwei Zeng; Qiuyin Zhu; Lijun Song

doi:10.1016/j.ijbiomac.2023.127291

Green and economic flame retardant prepared by the one-step method for polylactic acid

Int J Biol Macromol. 2023 Dec 31;253(Pt 7):127291. doi: 10.1016/j.ijbiomac.2023.127291. Epub 2023 Oct 6.

Authors

Hongyan Cheng¹, Yincai Wu², Wayne Hsu², Fenglong Lin², Shenglong Wang², Junwei Zeng², Qiuyin Zhu², Lijun Song³

Affiliations

¹ Fuzhou University, Fuzhou, Fujian 350108, China; Xiamen Institute of Rare Earth Materials, Chinese Academy of Sciences, Xiamen, China; Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China; Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen, China.
² Xiamen Institute of Rare Earth Materials, Chinese Academy of Sciences, Xiamen, China; Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China; Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen, China.
³ Xiamen Institute of Rare Earth Materials, Chinese Academy of Sciences, Xiamen, China; Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China; Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen, China. Electronic address: slj@fjirsm.ac.cn.

PMID: 37806420
DOI: 10.1016/j.ijbiomac.2023.127291

Abstract

Resolving the flammability of poly(L-lactic acid) (PLA) while ensuring its environmental friendliness and preserving key flame retardancy and mechanical properties represents a critical challenge. We have successfully developed a highly efficient and environmentally friendly flame retardant called Hexamethylenediamine tetramethylene phosphonic acid amine (HDME). The flame retardancy of PLA/HDME composites was significantly improved, as indicated by the LOI value of 29.1 % and UL-94 V-0 rating for PLA/3.5 HDME with only 3.5 % HDME addition. The results show a 23.4 % reduction in the total heat release (THR), a 40.0 % increase in the time to ignition (TTI), and a 21.2 % increase in the flame propagation index (FPI) compared to original PLA. Flame retardant mechanism of HDME involves the gas phase, condensed phase, and interrupted heat exchange effects. The HDME also preserved the original mechanical properties of PLA, with the elongation at break and tensile strength retention of PLA/3.5 HDME reaching 93.05 % and 89.65 %. This work provides a simple and efficient method for flame retardant modification of PLA, which can expand its application scope.

Keywords: Environmentally friendly approach; Hexamethylenediamine tetramethylene phosphonic acid; Intumescent flame retardants; Melamine; Polylactic acid.

MeSH terms

Amines
Cyclobutanes*
Flame Retardants*
Polyesters

Substances

poly(lactide)
Flame Retardants
Polyesters
Amines
Cyclobutanes