Preparation and application of epoxy resin derived from protocatechuic acid

被引：0
|
作者：
Cao Z. [1 ]
Yao Y. [1 ]
Tan J. [1 ]
Cheng Z. [2 ]
Cheng C. [3 ]
Zhu X. [1 ,2 ]
机构：
[1] College of Chemical Engineering, Nanjing Forestry University, Nanjing
[2] Anhui Engineering Research Center of Epoxy Resin and Additives, Huangshan
[3] Huangshan Kehong Bio-Flavors Co. Ltd., Huangshan
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2022年 / 39卷 / 07期
关键词：
epoxy resin; in situ toughening; mechanical properties; protocatechuic acid; thermal properties;
D O I：
10.13801/j.cnki.fhclxb.20211018.006
中图分类号：
学科分类号：
摘要：
The brittleness of epoxy resin needs toughening to meet the application requirements. Protocatechuic acid epoxy resin (PA-EP) was synthesized from protocatechuic acid (PA) and epichlorohydrin via two-step reaction, and used as special epoxy resin for the modification of bisphenol A epoxy resin. The structure and properties of the PA-EP were characterized by fourier transform infrared spectrometer (FTIR), nuclear magnetic resonance spectroscopy (1HNMR), potentiometric titration and viscosity tester. FTIR, 1HNMR and viscosity analyses indicate that the target product are synthesized with epoxy value of 0.73 eq/100 g and viscosity of 43.2 Pa·s at 25℃. The mechanical properties of PA-EP/E-51 thermosets are better than others when the mass ratio of PA-EP to E-51 is 10%. The tensile strength, flexural strength and impact strength are increased by 37.4%, 17.2% and 82.9%, respectively. The scanning electron microscope (SEM) images of impact section show that PA-EP/E-51 thermosets exhibit ductile fracture characteristics. Dynamic mechanical analysis (DMA) and thermogravimetry (TG) results indicate that the glass transition temperature (Tg) increases from 116.0℃ (neat E-51) to 137.3℃ with 12.5% of PA-EP/E-51. The weight loss 10% and the maximum decomposition rate temperature are decreased slightly while the residue content of 800℃ increases from 5.9% (neat E-51) to 9.8% (12.5% PA-EP/E-51). © 2022 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：3230 / 3237
页数：7
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