ADHESIVE FORCE OF POLYAMIDE-6 BONDED WITH ETHYL-2-CYANOACRYLATE COMPOUNDS
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
KNITU
2.
Kazan National Research Technological University
Type:
Article
Pages:
from 107
to 111
Status:
Published
Received:
22.12.2025
Accepted:
23.12.2025
Published:
23.12.2025
Language:
Russian
Keywords:
ADHESIVE STRENGTH, POLYAMIDE, ETHYL-2-CYANOACRYLATE, POLYMETHYLMETHACRYLATE, QUANTUM CHEMICAL CALCULATIONS, GIBBS ENERGY
Abstract (English):
This publication presents studies of the adhesive strength and water resistance of polyamide-6 (PA) plates of the «Rimamide» brand glued with ethyl-2-cyanoacrylate (ECA) adhesives, including additives of silica gel (SiO2·H2O), polymethylmethacrylate (PMMA). A wide range of ECA adhesives of industrial and household brands (country of origin) was studied: Axton, (China); Sila, (China); Kontakt, (Taiwan); Organide, (China); EG, (China); Akfix, (Turkey); Cosmofen, (Germany); ECA-RT and ECA-EO, Dzerzhinsk, (Russia); Master Teks, (China); Alteco, (Singapore). Based on the experiments carried out, the high adhesive strength of ECA adhesives to the surface of PA has been shown. Adhesive strength of more than 9 MPa was observed in adhesives of the following brands: Sila with the addition of silica gel, Axton, Cosmofen CA-12, ECA-RT. It was found that the PMMA additive has a dual effect - it reduces the adhesive strength, but increases the hydrolytic resistance of the ECA-PA adhesive compound. A general tendency has been revealed to increase the adhesive strength of adhesives with silica gel content after exposure to air for 24 hours at room temperature by an average of 18%. It has been shown that the addition of silica to the adhesive composition increases the hydrolytic resistance and adhesive strength of gel-like systems. To assess the nature of the high adhesive strength of cyanoacrylate adhesives, quantum chemical calculations of intermolecular interactions in the Gaussian 16W package were performed using the B3LYP method with basic sets 6-31G (d) and 6-311++G (d,p) model structures of PA complexes in the form of caprolactam and polyether in the form of ethyl ether of 2-cyanopropanoic acid, in comparison with polymethylmethacrylate in the form of isobutyric acid methyl ester. Gibbs energy values were obtained in the ECA and PA complex with a base of 6-31G (d) ΔG = 9.0 kcal/mol and with a base of 6-311++G (d,p) ΔG = 9.2 kcal/mol, and in the PMMA and PA complex-6 ΔG = 7.6 kcal/mol and ΔG = 7.9 kcal/mol, respectively. It was found that the ΔG of the poly-ECA-PA complex is thermodynamically more advantageous than the PMMA-PA complex. The Gibbs energy of the formation of intermolecular hydrogen bonds in the ECA and PA, PMMA and PA complexes does not differ significantly according to calculations using the bases 6-31G (d) and 6-311++G (d,p), therefore, the standard set of 6-31G (d) can be used in such calculations of the adhesive interaction.
This publication presents studies of the adhesive strength and water resistance of polyamide-6 (PA) plates of the «Rimamide» brand glued with ethyl-2-cyanoacrylate (ECA) adhesives, including additives of silica gel (SiO2·H2O), polymethylmethacrylate (PMMA). A wide range of ECA adhesives of industrial and household brands (country of origin) was studied: Axton, (China); Sila, (China); Kontakt, (Taiwan); Organide, (China); EG, (China); Akfix, (Turkey); Cosmofen, (Germany); ECA-RT and ECA-EO, Dzerzhinsk, (Russia); Master Teks, (China); Alteco, (Singapore). Based on the experiments carried out, the high adhesive strength of ECA adhesives to the surface of PA has been shown. Adhesive strength of more than 9 MPa was observed in adhesives of the following brands: Sila with the addition of silica gel, Axton, Cosmofen CA-12, ECA-RT. It was found that the PMMA additive has a dual effect - it reduces the adhesive strength, but increases the hydrolytic resistance of the ECA-PA adhesive compound. A general tendency has been revealed to increase the adhesive strength of adhesives with silica gel content after exposure to air for 24 hours at room temperature by an average of 18%. It has been shown that the addition of silica to the adhesive composition increases the hydrolytic resistance and adhesive strength of gel-like systems. To assess the nature of the high adhesive strength of cyanoacrylate adhesives, quantum chemical calculations of intermolecular interactions in the Gaussian 16W package were performed using the B3LYP method with basic sets 6-31G (d) and 6-311++G (d,p) model structures of PA complexes in the form of caprolactam and polyether in the form of ethyl ether of 2-cyanopropanoic acid, in comparison with polymethylmethacrylate in the form of isobutyric acid methyl ester. Gibbs energy values were obtained in the ECA and PA complex with a base of 6-31G (d) ΔG = 9.0 kcal/mol and with a base of 6-311++G (d,p) ΔG = 9.2 kcal/mol, and in the PMMA and PA complex-6 ΔG = 7.6 kcal/mol and ΔG = 7.9 kcal/mol, respectively. It was found that the ΔG of the poly-ECA-PA complex is thermodynamically more advantageous than the PMMA-PA complex. The Gibbs energy of the formation of intermolecular hydrogen bonds in the ECA and PA, PMMA and PA complexes does not differ significantly according to calculations using the bases 6-31G (d) and 6-311++G (d,p), therefore, the standard set of 6-31G (d) can be used in such calculations of the adhesive interaction.
Keywords:
ADHESIVE STRENGTH, POLYAMIDE, ETHYL-2-CYANOACRYLATE, POLYMETHYLMETHACRYLATE, QUANTUM CHEMICAL CALCULATIONS, GIBBS ENERGY
ADHESIVE STRENGTH, POLYAMIDE, ETHYL-2-CYANOACRYLATE, POLYMETHYLMETHACRYLATE, QUANTUM CHEMICAL CALCULATIONS, GIBBS ENERGY
