Determination of cure kinetic parameters and thermal stability of benzoxazine coating modified by poly (bisphenol-A borate)

• Published in: Progress in organic coatings 2023-05, Vol.178, p.107465, Article 107465
• Main Authors: Khodaeian, Hamidreza, Ahmadi, Zahed, Taromi, Faramarz Afshar
• Format: Article
• Language: English
• Subjects: Benzoxazine coating; Composite; Curing kinetic; Thermal properties
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2023.107465

Benzoxazine resin is a high-performance thermosetting resin that limits its use in ablative materials due to limitations such as toughness and high curing temperature. This work intends to investigate the effect of the introduction of poly (bisphenol-A borate) (PBAB) into benzoxazine coating on the curing kinetics and thermal stability. The curing reaction of benzoxazine coating in the presence of poly (bisphenol-A borate) was catalyzed by facilitating the oxazine ring opening. The kinetic of the cure was investigated by differential scanning calorimetry (DSC); then, the data were fitted and compared utilizing the Kissinger, Ozawa, and Borchardt-Daniels methods, which allow for determining the kinetic parameters of this system. Also, the results of thermo-gravimetric analysis (TGA) showed that with increasing the percentage of PBAB, thermal stability and char yield of composite increase significantly. [Display omitted] •Preparation and investigation of new coating of benzoxazine modified by poly (bisphenol-A borate).•The new coating, has the advantages of improving curing temperature, processability and thermal stability simultaneously.•All the cure kinetic parameters of the newly prepared coating were investigated and evaluated in several different methods.•PBAB acts as Lewis acid in the BZ coating curing process, and improves the kinetic parameters and thermal stability.