Relaxation Properties of Composite Materials Based on Epoxy-Rubber Mixtures Cured with Cardo-Polyarilate
Abstract: The kinetics of curing of ED-20 epoxy resin with polyarylate and the product of its preliminary esterification reaction with SCN-30 butadiene acrylonitrile carboxylate rubber was investigated by dynamic mechanical analysis. Polyester terephthalic acid and phenolphthalein were used as polyarylate. On the basis of temperature dependences of the tangent of the angle of mechanical losses and the dynamic shear modulus, the boundaries of the curing reaction interval due to the interaction of epoxy cycles with the ester group are determined, primary information on the properties of the resulting product is obtained. Electron microscopy has shown that the curing of epoxy-rubber compositions with polyarilate leads to the formation of microheterophase structures. Due to the significant difference in the values of the solubility parameters of polyarylate and rubber, micro-stratification of the system occurs with the release of rubber into particles of an independent phase. The coupling between the rubber phase and the polyarylate is carried out by the resin portion of the product of the preliminary esterification reaction, which due to the thermodynamic affinity mixes well with the polyheteroarylene, forming an interfacial layer. Subsequent heating of the compositions at 453 K, resulting in chemical interaction with polyarylate, further enhances this adhesion, which is reflected in a higher value of the dynamic shear modulus in a wide temperature range from 293 to 550 K. The presence of a rubber component in the composition leads to greater creep of the material under mechanical load.
Keywords: epoxy resin, butadiene acrylonitrile carboxylate rubber, polyarylate, dynamic shear modulus, tangent of the angle of mechanical losses, creep.
Pages: 55-62.
For citation: Kochergіn, Yu. S.; Zolotaryeva, V. V. Relaxation Properties of Composite Materials Based on Epoxy-Rubber Mixtures Cured with Cardo-Polyarilate. – Text : electronic. – In: Proceeding of the Donbas National Academy of Civil Engineering and Architecture. – 2022. – Issue 2022-1(153) Modern building materials. – Р. 55-62. – URL: https://donnasa.ru/publish_house/journals/vestnik/2022/2022-1(153)/st_07_kochergin_zolotareva.pdf (date of access: 19.11.2024). – ISSN 2519-2817.
Issue 2022-1 (153)
Journal: Proceeding of the Donbas National Academy of Civil Engineering and Architecture
Publish house: Donbas National Academy of Civil Engineering and Architecture
Journal: Proceeding of the Donbas National Academy of Civil Engineering and Architecture
Publish house: Donbas National Academy of Civil Engineering and Architecture