study on pbo/modified epoxy resin for high performance composites
- Paper number
IAC-08.C2.4.3
- Author
Ms. Hongfei Zheng, China
- Year
2008
- Abstract
A novel composites for solid rocket motor case by wet filament winding based on poly (p-phenylene benzobisoxazole )(PBO) fiber and modified epoxy resin was developed. The matrix was synthesized by our lab and the PBO fiber was treated by γ-ray. Curing process of the composites was determined by comprehensive thermal analyzer (DSC-TG) and process experiments. Material parameters, such as epoxy formula system, resin content and winding tension and so on, were studied. The research of the effect of the impregnated and winding process on the mechanical property of NOL ring composites was the emphases. Tensile strength, interlaminar shear strength and residual strength were employed to characterize the mechanical properties and heat-resistance, respectively. The fracture surface of the composites and the bonding interface between PBO fiber and matrix were analyzed by scanning electron microscopy (SEM). The results showed that the longitudinal tension strength of PBO fiber-reinforced NOL rings made by wet filament winding was higher than that of rings made by pre-preg filament winding. However, the interlaminar shear strength of NOL rings made by wet filament winding was lower than that of rings made by pre-preg filament winding because of inertial surface of PBO fiber. The amount of resin in the composites had obvious influence on mechanical properties of the composites. Within a certain extent, with the increasing of resin content, the interlaminar shear strength increased but the longitudinal tension strength decreased. Precuring process was employed to control resin content in wet filament winding. Winding tension play an important role in resin content and mechanical properties of composites. Pores in composites increased with decreasing winding tension while resin content decreased with increasing winding tension. When the resin content was 35vol% and the ratio of winding tension/roving breaking load was 4%, the best composite system with the longitudinal tension strength of 3200MPa and the interlaminar shear strength of 25MPa was obtained. Experimental results showed that PV/W value of f200mm pressure vessels could reach 55Km and the ratio of delivered fiber strength (k) was 82%. After heat treatment at 120 degrees centigrade for 10h, the longitudinal tension strength was equal to its original strength without heat treatment. This indicated that this composite had good heat-resistance. Microstructure of the composite (by SEM) had a good agreement with its mechanical property.
- Abstract document
- Manuscript document
(absent)