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Xu X, Peng J, Yang J, Hu D, Qian D, Chang Z, Tan Q, Li Y. Effects of high polyamic acid content and curing process on properties of epoxy resins. E-POLYMERS 2022. [DOI: 10.1515/epoly-2022-0028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Epoxy/polyamic acid (EP/PAA) adhesives with high polyimide precursor-PAA content have been synthesized and then cured. The structure, thermal, and adhesive properties were investigated by Fourier transform infrared spectroscopy, thermogravimetric analysis, and tensile shear test. The effects of PAA content and curing process on the tensile shear strength were also studied. The results showed that the addition of PAA improved the heat resistance and reduced the water absorption. EP/PAA adhesive kept good adhesion. A kind of EP/PAA composite adhesive with excellent comprehensive properties was prepared in this study.
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Affiliation(s)
- Xiaoyan Xu
- School of Materials Science and Engineering, Tongji University , Shanghai 201804 , China
| | - Jinchan Peng
- School of Materials Science and Engineering, Tongji University , Shanghai 201804 , China
| | - Jianjiang Yang
- Research and Development Department, Shaoxing Jucheng New Material Technology Co., Ltd , Shaoxing 312500 , China
| | - Dedong Hu
- College of Electromechanical Engineering, Qingdao University of Science and Technology , Qingdao 266061 , China
| | - Duoduo Qian
- School of Materials Science and Engineering, Tongji University , Shanghai 201804 , China
| | - Zhihong Chang
- School of Materials Science and Engineering, Tongji University , Shanghai 201804 , China
| | - Qinggang Tan
- School of Materials Science and Engineering, Tongji University , Shanghai 201804 , China
| | - Yan Li
- School of Materials Science and Engineering, Tongji University , Shanghai 201804 , China
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Zhang Y, Zhang L, Tan F, Xiao Z. Effect of laser irradiation on morphology and dielectric properties of quartz fiber reinforced epoxy resin composite. E-POLYMERS 2021. [DOI: 10.1515/epoly-2021-0063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The quartz fiber-reinforced epoxy resin-based composites (QFRECs) were fabricated by resin transfer molding (RTM), and then the effect of laser ablation on the structure and dielectric properties of the prepared composite was investigated. The FTIR, XRD, and SEM analyses show that the thermal decomposition, pyrolysis, carbonization, graphitization, and ablation occurred on the surface of the epoxy resin under laser irradiation. The in situ produced carbon endows the QFREC with an improved dielectric constant, which increases maximally from 3.3 to 4.5 in the range of 7–17 GHz under the energy intensity of 226 W·cm−2. Compared with short-time irradiation (5 s), long-time irradiation (10 s) exhibits a greater impact on the dielectric constant due to the formation of crystal graphite at prolonged high temperature. Meanwhile, the rough and deep pits are inclined to form onthe surface of the long-time irradiative composite. These findings provide guidance for the practical application of QFREC as wave-transmitting materials.
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Affiliation(s)
- Yongqiang Zhang
- Institute of Fluid Physics, China Academy of Engineering Physics , Mianyang , Sichuan 621900 , China
| | - Li Zhang
- Institute of Fluid Physics, China Academy of Engineering Physics , Mianyang , Sichuan 621900 , China
| | - Fuli Tan
- Institute of Fluid Physics, China Academy of Engineering Physics , Mianyang , Sichuan 621900 , China
| | - Zhichao Xiao
- School of Materials Science and Engineering, Xi’an Jiaotong University , Xi’an , Shaanxi 710049 , China
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