PRODUCTION OF CARBON FIBER-REINFORCED RESIN BASED ON BENZOXAZINE-PHTHALONITRILE COMPOSITIONS CATALYZED BY BENZOIC ACID
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Kazan National Research Technical University named after A.N. Tupolev
2.
Kazan National Research Technical University named after A.N. Tupolev
3.
Kazan National Research Technical University named after A.N. Tupolev
4.
Kazan National Research Technical University named after A.N. Tupolev
(docent)
employee
employee
5.
Kazan Federal University
6.
Kazan Federal University
Type:
Article
Pages:
from 44
to 49
Status:
Published
Received:
25.12.2025
Accepted:
25.12.2025
Published:
25.12.2025
Language:
Russian
Keywords:
PHTHALONITRILE, BENZOXAZINE, ACID CATALYST, IR SPECTROSCOPY, DIFFERENTIAL SCANNING CALORIMETRY, POWDER COATING, CARBON FIBER
Abstract (English):
To accelerate the curing process of benzoxazine-phthalonitrile compositions, an acid catalyst, benzoic acid, was used. The Thermokinetics program was used to calculate the kinetic processes of curing benzoxazine-phthalonitrile compositions with different catalyst contents. It was shown that the introduction of the catalyst in an amount of up to 2 wt.% is sufficient to effectively reduce the curing onset temperature of the benzoxazine-phthalonitrile composition. The curing process of benzoxazine-phthalonitrile compositions was studied using IR spectroscopy. Using differential scanning calorimetry, it was shown that the introduction of the catalyst, benzoic acid, into the benzoxazine-phthalonitrile binder allows for an effective reduction in the curing onset temperature. Using dynamic mechanical analysis, it was shown that the benzoxazine-phthalonitrile composition containing the catalyst has a glass transition temperature of about 212 °C after curing. Based on the data obtained, a powder binder composition was developed for producing carbon fiber reinforced plastics. Dry prepregs were obtained by powder spraying of benzoxazine-phthalonitrile binder in an electrostatic field on carbon fabric. Consolidation modes of carbon fiber plate from dry prepregs were selected. To optimize the process of thermoforming consolidated plates based on benzoxazine-phthalonitrile binders using a rheokinetic model, a temperature-time mode of partial curing of the binder was selected. The degree of curing of the binder of about 20% is achieved by maintaining a temperature of 120 °C for 7 minutes. Taking into account the obtained data, a technological mode of thermopressing of products from a carbon fiber consolidated plate based on a benzoxazine-phthalonitrile binder containing a catalyst was proposed.
To accelerate the curing process of benzoxazine-phthalonitrile compositions, an acid catalyst, benzoic acid, was used. The Thermokinetics program was used to calculate the kinetic processes of curing benzoxazine-phthalonitrile compositions with different catalyst contents. It was shown that the introduction of the catalyst in an amount of up to 2 wt.% is sufficient to effectively reduce the curing onset temperature of the benzoxazine-phthalonitrile composition. The curing process of benzoxazine-phthalonitrile compositions was studied using IR spectroscopy. Using differential scanning calorimetry, it was shown that the introduction of the catalyst, benzoic acid, into the benzoxazine-phthalonitrile binder allows for an effective reduction in the curing onset temperature. Using dynamic mechanical analysis, it was shown that the benzoxazine-phthalonitrile composition containing the catalyst has a glass transition temperature of about 212 °C after curing. Based on the data obtained, a powder binder composition was developed for producing carbon fiber reinforced plastics. Dry prepregs were obtained by powder spraying of benzoxazine-phthalonitrile binder in an electrostatic field on carbon fabric. Consolidation modes of carbon fiber plate from dry prepregs were selected. To optimize the process of thermoforming consolidated plates based on benzoxazine-phthalonitrile binders using a rheokinetic model, a temperature-time mode of partial curing of the binder was selected. The degree of curing of the binder of about 20% is achieved by maintaining a temperature of 120 °C for 7 minutes. Taking into account the obtained data, a technological mode of thermopressing of products from a carbon fiber consolidated plate based on a benzoxazine-phthalonitrile binder containing a catalyst was proposed.
Keywords:
PHTHALONITRILE, BENZOXAZINE, ACID CATALYST, IR SPECTROSCOPY, DIFFERENTIAL SCANNING CALORIMETRY, POWDER COATING, CARBON FIBER
PHTHALONITRILE, BENZOXAZINE, ACID CATALYST, IR SPECTROSCOPY, DIFFERENTIAL SCANNING CALORIMETRY, POWDER COATING, CARBON FIBER
