Coefficient of thermal expansion and mechanical properties of modified fiber-reinforced boron phenolic composites

Boron phenolic resin is widely used in the aerospace field because of its excellent thermal properties. In this article, nitrile rubber powder was added to phenolic resin to modify fiber-reinforced phenolic resin composites. The results showed that the tensile strength continued to decrease; the elongation ratio increased from 20.01% to 32.04%; and flexural strength and flexural modulus reached the highest values of 188 and 9,401 MPa, respectively. Thermal analysis showed that rubber had little effect on the heat resistance at low temperatures, especially below 350 degrees C. Furthermore, the coefficient of thermal expansion of the composites increased from 8.9 x 10(-6) to 1.5 x 10(-5) K-1, increasing by nearly 70%. The electron microscopy images showed a tortuous fracture path in modified composites, which indicated that rubber powder-modified phenolic composites had a ductile fracture.

Automated summary

This article explores the modification of fiber-reinforced phenolic resin composites by adding nitrile rubber powder to the resin. It is found that the addition of rubber powder can improve the elongation ratio and flexural properties of the composites, but it decreases the tensile strength.