Biomimetic synthesis of sea urchin-Like MOFs-LDH and ternary synergistic flame retardants to improve the flame retardancy and UV resistance of Polylactic acid

被引：3

作者：

Chen, Yichen ^{[1
]}

Jin, Xiaodong ^{[1
]}

Wang, Wanfu ^{[1
]}

Tang, Wufei ^{[2
]}

Liu, Chenhao ^{[1
]}

Sun, Shibing ^{[1
]}

机构：

[1] Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

[2] Hunan Univ Sci & Engn, Hunan Engn Technol Res Ctr Comprehens Dev & Utiliz, Yongzhou 425199, Peoples R China

来源：

POLYMER DEGRADATION AND STABILITY | 2024年 / 230卷

基金：

中国国家自然科学基金;

关键词：

Flame Retardancy; UV Resistance; Polylactic Acid; MOFs-LDH; POLY(LACTIC ACID); MELAMINE;

D O I：

10.1016/j.polymdegradstab.2024.111052

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

In this work, a novel single molecule flame retardant (DT-S) was synthesized through the self-assembly of diethyltriamine penta-(methylphosphonic) acid and sulfanilamide. Additionally, the three-dimensional sea urchin-like layered double hydroxide hollow dodecahedral structure (MOFs-LDH) was etched from a MOF to increase specific surface area and reaction sites. The chemical structures of DT-S and MOFs-LDH were comprehensively characterized. Subsequently, the obtained flame retardants were molten-compounding into PLA matrix. The fire performance of PLA composites was evaluated by limiting oxygen index (LOI), vertical combustion (UL-94), and cone calorimeter tests. Compared with neat PLA sample, the inclusion of 3 % DT-S and 2 % MOFs-LDH led to an increase in the LOI value from 19.9 to 35.0 %, an upgrade in the UL-94 rating from none to V-0, and a reduction in the peak heat release rate from 524.4 to 401.2 kW m(-2). Analysis of the decomposition products of the PLA composites and the observation of char morphology suggested that DT-S and MOFs-LDH took effects in both condensed phase and gas phase. Furthermore, the evaluation of the UV protection performance using a UV-visible near-infrared spectrophotometer indicated an enhancement in the UV protection performance of PLA, achieving an "excellent" level in evaluating UV protection performance (UPF 50+).

引用

页数：13