Facile Synthesis of Phosphorus-Free Biobased Epoxy Resin with Exceptional Flame Retardancy, Mechanical Properties, and Heat Resistance,ACS Applied Polymer Materials

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Facile Synthesis of Phosphorus-Free Biobased Epoxy Resin with Exceptional Flame Retardancy, Mechanical Properties, and Heat Resistance
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-10-26 , DOI: 10.1021/acsapm.3c01928
Jun Ying ₁ , Yuxiang Zhang ₁ , Jituo Chen ₁ , Shi-Neng Li ₁ , Jihao Han ₁ , Yizhu Wang ₁ , Xinying Zhou ₁ , Qiang Wu ₁ , Qian Li ₁ , Jinfeng Dai ₁ , Baiyu Jiang _{1,

2}

Affiliation

Preparing biobased epoxy resins with intrinsic flame retardancy, excellent mechanical properties, and high heat resistance has the potential to be used in high heat and flame-retardant fields (e.g., aerospace industry, electrical, and electronic areas). However, seeking renewable epoxy resins with those goals is still challenging. In this work, we prepare a biobased epoxy precursor (PGE) derived from phloretin via a one-step epoxidizing reaction and then solidified by 4,4′-diaminodiphenyl sulfone (DDS) to obtain the target epoxy resin (PGE/DDS). The high molecular chain rigidness and char yield by in situ-generated Schiff bases combined with aromatic rings endow the PGE/DDS with high glass transition temperature (T_g up to ∼259.2 °C), excellent mechanical properties (i.e., Young’s modulus and hardness up to ∼5.41 and ∼0.35 GPa, respectively), and intrinsic flame retardancy. PGE/DDS resin passed V-0 rating in the underwriters laboratories-94 (UL-94) test with a limiting oxygen index (LOI) of 33.5% and significantly decreased the peak heat release rate (PHRR) and total heat release (THR) by 71.1 and 41.2%, respectively. Furthermore, the PGE/DDS resin exhibits enhanced dimensional stability due to its increased cross-linking density and additional antibacterial characteristics because of the in situ-generated Schiff bases. Our strategy will promote the facile preparation and application of biobased epoxy resins with high performance and versatile properties in high heat and flame-retardant fields.

中文翻译：

轻松合成具有优异阻燃性、机械性能和耐热性的无磷生物基环氧树脂

制备具有固有阻燃性、优异机械性能和高耐热性的生物基环氧树脂有望应用于高热阻燃领域（如航空航天、电气和电子领域）。然而，寻找实现这些目标的可再生环氧树脂仍然具有挑战性。在这项工作中，我们通过一步环氧化反应制备了根皮素衍生的生物基环氧前体（PGE），然后通过4,4'-二氨基二苯砜（DDS）固化以获得目标环氧树脂（PGE/DDS）。原位生成的席夫碱与芳环结合所带来的高分子链刚性和炭产率赋予 PGE/DDS 高玻璃化转变温度（ T g高达_~ 259.2 °C）、优异的机械性能（即杨氏模量和硬度）分别高达〜5.41和〜0.35 GPa）和固有的阻燃性。PGE/DDS 树脂通过了保险商实验室 94 (UL-94) 测试的 V-0 等级，极限氧指数 (LOI) 为 33.5%，并显着降低了峰值放热率 (PHRR) 和总放热量 (THR)分别增长了 71.1% 和 41.2%。此外，PGE/DDS 树脂由于交联密度增加而表现出增强的尺寸稳定性，并且由于原位生成的席夫碱而具有额外的抗菌特性。我们的战略将促进高性能、多用途的生物基环氧树脂在高耐热和阻燃领域的简便制备和应用。

更新日期：2023-10-26

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