Ultrastiff Biobased Epoxy Resin with High Tg and Low Permittivity: From Synthesis to Properties
Ultrastiff Biobased Epoxy Resin with High Tg and Low Permittivity: From Synthesis to Properties
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DOI：
10.1021/acssuschemeng.6b00479
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发表时间：
2016-04
影响因子：
8.4
通讯作者：
Jintao Wan;Jianqing Zhao;B. Gan;Cheng Li;J. Molina-Aldareguia;Ying Zhao;Ye-Tang Pan;De‐yi Wang-De‐yi-W
中科院分区：
文献类型：
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作者：
Jintao Wan;Jianqing Zhao;B. Gan;Cheng Li;J. Molina-Aldareguia;Ying Zhao;Ye-Tang Pan;De‐yi Wang-De‐yi-W
获得具有更好的热机械性能(如玻璃化转变温度Tg和储存模数)、力学性能和介电性能与双酚A环氧树脂(DGEBA)相似甚至更好的生物基环氧树脂对于许多应用是至关重要的，但仍然是一个巨大的挑战。在这里，我们开发了一种新的丁香酚基环氧单体(TEU-EP)，具有支化拓扑结构和非常丰富的生物基保留率(80wt%)。3，3‘-二氨基二苯基砜(33DDS)能很好地固化TEU-EP，生成的TEU-EP/33DDS体系可视为“单一”的环氧组分，在较高的加工温度下表现出足够的反应活性。重要的是，与DGEBA/33DDS相比，TEU-EP/33DDS的玻璃化转变温度、杨氏模量和硬度分别提高了33℃、39%和55%，并表现出更好的蠕变抗力和尺寸稳定性。TEU-EP/33DDS还具有较低的介电常数、介电损耗因子和可燃性，且具有较高的弹性系数。
Harvesting biobased epoxy resins with improved thermomechanical properties (e.g., glass transition temperature Tg and storage modulus), mechanical and dielectric similar and even superior to that of bisphenol A epoxy resin (DGEBA) is vital to many applications, yet remains a substantial challenge. Here we develop a novel eugenol-based epoxy monomer (TEU-EP) with a branched topology and a very rich biobased retention (80 wt %). TEU-EP can be well cured by 3,3′-diaminodiphenyl sulfone (33DDS) and the resultant TEU-EP/33DDS system can be considered as a “single” epoxy component, exhibiting adequate reactivity at high processing temperatures. Importantly, compared with DGEBA/33DDS, TEU-EP/33DDS achieves a 33 °C, 39% and 55% increment in the glass transition temperature, Young’s modulus, and hardness, respectively, and shows the improved creep resistance and dimensional stability. TEU-EP/33DDS is also characterized by the considerably reduced permittivity, dielectric loss factor, and flammability with high yie...