Synergistic effect of Co-MOF/epoxy modified tannic acid/ammonium polyphosphate on flame retardancy, anti-melt dripping and mechanical properties of polylactic acid

被引：5

作者：

Wei, Sining ^{[1
]}

Zhong, Wentao ^{[1
]}

Xu, Pengwu ^{[1
]}

Niu, Deyu ^{[1
]}

Yang, Weijun ^{[1
]}

Shen, Yirui ^{[2
]}

Liu, Tianxi ^{[1
]}

Ma, Piming ^{[1
]}

机构：

[1] Jiangnan Univ, Sch Chem & Mat Engn, Key Lab Synthet & Biol Colloids, Minist Educ, 1800 Lihu Rd, Wuxi 214122, Peoples R China

[2] Ningbo Univ Technol, Sch Mat & Chem Engn, Ningbo 315211, Zhejiang, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2024年 / 500卷

关键词：

PLA; Synergistic flame retardancy; Anti-melt dripping; Carbon layer; METAL-ORGANIC FRAMEWORK; ENHANCING FIRE SAFETY; THERMAL-DEGRADATION; AGENT; RESIN;

D O I：

10.1016/j.cej.2024.156772

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Achieving flame retardancy and anti-dripping properties in polylactic acid (PLA) while preserving its mechanical integrity remains a significant challenge. In this study, a novel organic ligand rich in phosphorus (P) and nitrogen (N) was synthesized and coordinated with Co2+ions to form a cobalt-based metal-organic framework (Co-MOF) with a multilayer mesoporous structure, acting as an effective carbonization agent. This Co-MOF was then compounded with epoxy-modified tannic acid (eTA) and ammonium polyphosphate (APP) to create a synergistic flame-retardant system for PLA (PLA/MAT). The Co-MOF provides numerous active sites for catalytic oxidation, promoting the formation of a uniform, hill-like expanded carbon layer. During pyrolysis, the Co-MOF and APP yield cobalt oxides and polyphosphates, which catalyze the dehydration of PLA and eTA, facilitating carbonization and forming a continuous, dense protective layer. Consequently, the PLA/MAT system exhibits both robust mechanical properties and excellent flame retardancy, as demonstrated by a limiting oxygen index (LOI) of 27.0 % and a UL-94 V-0 rating, with no melt dripping observed during combustion tests. This work offers a novel approach for enhancing the flame retardancy and anti-dripping performance of PLA, with potential applications in engineering, electronics, and the automotive industry.

引用

页数：13