Abstract
Copolymerization is the typical method to obtain the high-performance resin composites, due to its universality and regulation performance. It can be employed among various resin matrices with active groups to obtain the desired structures, and subsequently, the outstanding properties. In this work, the copolymerization between the allyl-functional phthalonitrile-containing benzoxazine resin (DABA-Ph) and 4,4′-bis(Maleimidodiphenyl)methane (BMI) were monitored. The interactions among the active groups including allyl moieties, maleimide, benzoxazine rings and nitrile groups were investigated. Differential scanning calorimetry (DSC) and dynamic rheological analysis (DRA) were used to study the curing behaviors and the processing properties. The possible curing processes were proposed and confirmed by Fourier transform infrared spectroscopy (FTIR). Then, glass fiber-reinforced DABA-Ph/BMI composites were designed, and their thermal-mechanical properties were studied. Results indicated that all the composites exhibited outstanding flexural strength, flexural modulus, and high glass-transition temperatures (Tg > 450 °C). The thermal stability of the composites was studied by thermogravimetry (TGA) and evaluated by the integral program decomposition temperature (IPDT). it is believed that the excellent thermal mechanical properties and outstanding Tg as well as good thermal stability would enable the reinforced copolymer-based laminates to be applied in wider fields.
Highlights
Fiber-reinforced composite laminates have become more important due to their wide applications in fields from aerospace to energetics [1,2,3]
Glass fiber-reinforced composite laminates were prepared and their mechanical properties, glass-transition temperatures, crosslinking and thermal stability were systematically investigated. it is expected that the combination of DABA-Ph and BMI would result in an improved polymer matrix-based composite laminate
DABA-Ph was synthesized in our laboratory and its structure was showed in Scheme 1a [22]
Summary
Fiber-reinforced composite laminates have become more important due to their wide applications in fields from aerospace to energetics [1,2,3]. Various materials usually possess different advantages and they could combine with each other to exhibit their own excellent properties, such as good mechanical properties, processability and high glass-transition temperatures [8,9,10]. Polymers 2018, 10, 596 high-performance thermoset resin, bismaleimide (BMI) possesses excellent thermal and mechanical properties, high glass-transition temperature and high modulus [14]. Thermosets derived from phthalonitrile resins have attracted increasing attention due to their excellent glass-transition temperature (Tg ), outstanding thermal and thermal-oxidative stability, satisfactory mechanical properties, and superior resistance to moisture, chemicals, and fire [16,17]. Glass fiber-reinforced composite laminates were prepared and their mechanical properties, glass-transition temperatures, crosslinking and thermal stability were systematically investigated. Glass fiber-reinforced composite laminates were prepared and their mechanical properties, glass-transition temperatures, crosslinking and thermal stability were systematically investigated. it is expected that the combination of DABA-Ph and BMI would result in an improved polymer matrix-based composite laminate
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