Epoxy resin with excellent ultraviolet resistance and mechanical properties derived from renewable camphoric acid
Epoxy resin with excellent ultraviolet resistance and mechanical properties derived from renewable camphoric acid
复制标题
DOI：
10.1002/pat.5390
复制
发表时间：
2021-05-16
影响因子：
3.4
通讯作者：
Liu, Xiaoqing
中科院分区：
文献类型：
--
作者：
Hu, Jingyuan;Wang, Chunhong;Liu, Xiaoqing
通常情况下，芳香族化合物衍生的高性能环氧树脂存在泛黄和脆性两大缺点，因此目前对合成具有优异的抗紫外线性能和优异的强度和韧性的环氧树脂仍然是一个挑战。本文以可再生的樟脑酸为原料，通过一条高效、可扩展的路线合成了一种新型的生物基环氧树脂樟脑酸二缩水甘油酯(DGECA)。用甲基六氢邻苯二甲酸酐(MHHPA)固化前，用傅立叶变换红外光谱(FT-IR)、核磁共振(NMR)和质谱仪对DGECA的化学结构进行了表征。与固化的双酚A二缩水甘油醚/MHHPA相比，固化的DGECA/MHHPA体系的弯曲强度、定伸应力和冲击强度分别提高了11.5%、16.7%和109.4%。此外，固化后的DGECA具有极低的紫外吸收(0.038A)和更好的抗紫外线性能。本工作为利用可再生原料的独特结构合成具有优异抗紫外线和高韧性的环氧树脂提供了一种新的策略。
Generally, high-performance epoxy resins, which are derived from aromatic compounds have two major disadvantages of yellowing and brittleness, and thus it presently remains a challenge for the facile synthesis of epoxy resin with excellent ultraviolet resistance and superior strength and toughness. Herein, a novel bio-based epoxy resin diglycidyl ester of camphoric acid (DGECA) was synthesized from the renewable camphoric acid via an efficient and scalable route. The chemical structure of DGECA was carefully characterized by Fourier transform infrared (FT-IR), nuclear magnetic resonance (NMR), and mass spectrometry before being cured with methylhexahydrophthalic anhydride (MHHPA). Compared with the cured diglycidyl ether of bisphenol A (DGEBA)/MHHPA, the cured DGECA/MHHPA system achieved 11.5%, 16.7%, and 109.4% increment in flexural strength (126 MPa vs. 113 MPa), modulus (2.8 GPa vs. 2.4 GPa), and impact strength (6.7 kJ/m(2) vs. 3.2 kJ/m(2)), respectively. Moreover, cured DGECA exhibited extremely lower ultraviolet absorption (0.038A) and better ultraviolet resistance than that of cured DGEBA. This work provides a new strategy to synthesize epoxy resin with excellent ultraviolet resistance and high toughness by using the unique structure of renewable feedstock.