Reinforcement of Silicon-Containing Arylacetylene/Quarts Fiber composites by poly(imide-co-siloxane) macromolecular coupling agent

摘要

In this paper, poly(imide siloxane) copolymers (PISs) with crystalline polyimide hard block and PISs with amorphous polysiloxane soft block were introduced into a novel macromolecular silane coupling agent. The result showed that the interlaminar shear strength (ILSS), flexural strength and notched impact strength increased by 47.0%, 60.6% and 78.1%, respectively. At 250 °C, the retention rate of ILSS and flexural strength reached 81.9% and 85.1%. The retention rate of ILSS and flexural strength reached 57.9% and 59.3% at 500 °C, respectively. The surface morphology was explored by X-ray photoelectron spectroscopy (XPS), and the data revealed that chemical bonding was tight between fiber and P3. Finally, the mechanism of reinforcement and toughness extracted from interphase morphologies of scanning electron microscopy (SEM) suggested that soft and moderate macromolecule layers were constructed between the matrix and the fiber when treated with P3, which improved the mechanical strength and toughness of the Silicon-Containing Arylacetylene/Quarts Fiber (PSA/QF) composites. Overall, these findings look promising for future in reinforcement and heat-resistance.