Highly advanced phthalonitrile composites from epoxy‐ended hyperbranched poly(trimellitic anhydride ethylene glycol) ester grafted basalt fibers

Abstract

In this study, a partially bio-based composite was prepared from a highperformance thermosetting resin, namely the phthalonitrile, and chopped basalt fibers (CBFs). Aiming to create strong covalent bonds between the matrix and the fillers, the CBFs were priorly grafted with an epoxy-ended hyperbranched poly (trimellitic anhydride ethylene glycol) ester (EHBP). The modification technique was validated by infrared spectroscopy and scanning electron microscopy (SEM).The effect of the fillers treatment on the mechanical performances highlighted remarkable enhancements in the tensile, bending, and Charpy impact properties.For instance, the tensile strength and modulus values were 30% and 20% higher than those afforded by the pristine fibers. Meanwhile, the SEM analysis of the fractured surfaces clearly confirmed the excellent state of adhesion and dispersion of the treated fillers with the polymeric matrix. Additionally, the influence of different quantities of EHBP-CBFs on the composite properties further revealed the exceptionally high mechanical properties of the developed materials. In fact, the tensile strength attained exceptional value of about 310 MPa for the composite of 20 wt% of EHBP-CBFs. Overall, this study unraveled the great potential of these newly developed materials with a focus on overcoming the debonding phenomena and easing the stress-transfer between the constituents.

Constructing nano SiO2‐anchored hyperbranched polymer hybrid architectures for thermosetting epoxy systems with outstanding mechanical property

“…As shown by the SEM images in Figure 7A,D–H, EP/CHPBE‐SiO 2 composites exhibit much rougher fracture surfaces than the pure EP, and the increased fiber protrusions, bifurcation and/or deflection of cracks and crack blunting can be clearly observed on the fracture surfaces of EP/CHPBE‐SiO 2 composites, indicating that the addition of CHBPE‐SiO 2 can increase the energy consumption modes and improve the mechanical property of EP matrix. [ 32,33,40,44,64 ] The interfaces between CHBPE‐SiO 2 and matrix for all EP/CHBPE‐SiO 2 composites contact tightly, and no debonding phenomenon can be observed in the inserted SEM images in Figure 7E–H, indicating that the strong interfacial interaction between CHBPE‐SiO 2 and matrix can effectively improve the load transfer. In addition, the SEM images inserted in Figure 7E–H show the good dispersion state of SiO 2 particles and few SiO 2 agglomerates in EP/CHBPE‐SiO 2 composites, which can effectively improve the load transfer.…”

“…When HBPs are used as nonreactive or reactive modifiers, phaseseparated or non-phase-separated structure can be obtained in matrix. [32,34,[41][42][43][44][45] Although a high content of HBPs significantly improves the impact resistance of the matrix, it can lead to significant decreases in glass-transition temperature (T g ) and stiffness of matrix. [35,46,47] As we know, HBPs have highly branched structure, which offer good opportunities for the formation of nanocavities/pockets in HBPs.…”

Preparation of phthalonitrile resins containing siloxane linkages with improved processability

“…Considering the excellent mechanical properties and thermal stability of phthalonitrile, it is usually blended or copolymerized with epoxy resin, benzoxazine resin, or cyanate ester resin to prepare a series of resins with high performance and excellent thermal stability. [28][29][30][31][32] Additionally, widening the processing window of phthalonitrile resin by blending different types of phthalonitrile monomers to prepare phthalonitrile alloy resins has been demonstrated to be feasible. Domingez and Keller blended a low melting point phthalonitrile monomer containing ether bonds (40°C) with high melting point biphenyl monomers (4,4'-bis(3,4-dicyanophenoxy) biphenyl (BPh)) for the first time, 33 which widened the processing window of BPh by 30°C and the prepared resin showed excellent thermal stability.…”

Properties and structural features of epoxycomposites reinforced with modified PAN- flagellum

“…4, С. 200-205 post@vestnik-vsuet.ru 201 Введение Полиакрилонитрильный технический жгутик, обладающий реакционной активностью функциональных групп [1][2][3][4] и способностью к улучшению физико-механических свойств и адгезионной совместимости к эпоксидному связующему вследствие его аппретирования модификаторами -3-аминопропилтриэтоксисиланом (АГМ-9), 3-глицидоксипропилтриметоксисиланом (А-187), 3-метакрилоксипропилтриметоксисиланом (А-174), комбинацией гликолевых эфиров жирных кислот -Duron OS 3151, может быть рекомендован в качестве перспективной армирующей системы в технологии армированных пластиков [5][6][7][8][9][10][11][12][13][14][15][16].…”