Designing a Phthalonitrile/Benzoxazine Blend for the Advanced GFRP Composite Materials

• Published in: Chinese journal of polymer science 2018, Vol.36 (1), p.106-112
• Main Authors: Yang, Xu-Lin, Li, Kui, Xu, Ming-Zhen, Liu, Xiao-Bo
• Format: Article
• Language: English
• Subjects: Benzoxazines; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Composite materials; Condensed Matter Physics; Fiber composites; Fiber reinforced polymers; Glass fiber reinforced plastics; Industrial Chemistry/Chemical Engineering; Mechanical properties; Modulus of rupture in bending; Polymer matrix composites; Polymer Sciences; Thermosetting resins
• ISSN: 0256-7679; 1439-6203
• DOI: 10.1007/s10118-018-2033-y

High performance resin must be used in the high performance glass fiber-reinforced plastic（GFRP） composites, but it is sometimes difficult to balance the processabilities and the final properties in the design of advanced thermoset GFRP composites. In this study, a phthalonitrile/benzoxazine（PPN/BZ） blend with excellent processability has been designed and applied in the GFRP composite materials. PPN/BZ blend with good solubility, low melt viscosity, appropriate gel condition and low-temperature curing behavior could enable their GFRP composite preparation with the prepreg-laminate method under a relatively mild condition. The resulted PPN/BZ GFRP composites exhibit excellent mechanical properties with flexural strength over 700 MPa and flexural modulus more than 19 GPa. Fracture surface morphologies of the PPN/BZ GFRP composites show that the interfacial adhesion between resin and GF is improved. The temperatures at weight loss 5%(T5%) and char residue at 800 °C of all PPN/BZ GFRP composites are over 435 °C and 65% respectively. PPN/BZ GFRP composites with high performance characteristics may find applications under some critical circumstances with requirements of high mechanical properties and high service temperatures.