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

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2024-10-26 DOI:10.1016/j.polymdegradstab.2024.111052

Yichen Chen , Xiaodong Jin , Wanfu Wang , Wufei Tang , Chenhao Liu , Shibing Sun

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Abstract

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+).

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仿生合成海胆状 MOFs-LDH 和三元协同阻燃剂以提高聚乳酸的阻燃性和抗紫外线性能

本研究通过二乙基三胺五甲基膦酸和磺胺的自组装合成了一种新型单分子阻燃剂（DT-S）。此外，还从 MOF 中蚀刻出三维海胆状层状双氢氧化物中空十二面体结构（MOFs-LDH），以增加比表面积和反应位点。对 DT-S 和 MOFs-LDH 的化学结构进行了全面表征。随后，将得到的阻燃剂熔融复合到聚乳酸基体中。通过极限氧指数（LOI）、垂直燃烧（UL-94）和锥形量热计测试评估了聚乳酸复合材料的阻燃性能。与纯聚乳酸样品相比，加入 3 % DT-S 和 2 % MOFs-LDH 后，LOI 值从 19.9 % 提高到 35.0 %，UL-94 等级从无提高到 V-0，峰值热释放率从 524.4 kW m-2 降低到 401.2 kW m-2。对聚乳酸复合材料分解产物的分析和对焦炭形态的观察表明，DT-S 和 MOFs-LDH 在凝结相和气相中都发挥了作用。此外，使用紫外可见近红外分光光度计进行的紫外线防护性能评估表明，聚乳酸的紫外线防护性能有所提高，在紫外线防护性能评估中达到了 "优秀 "水平（UPF 50+）。

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.