Thermoplastic resin is being applied as the matrix of the continuous fiber reinforced composites. But it is difficult to impregnate reinforcement strands with the melted resin because of its high viscosity, and the adhesive condition at the fiber/matrix micro interface becomes poor. Therefore, it is necessary to estimate the adhesive condition at the interface.
The purpose of this investigation is to estimate the adhesive condition at the fiber/matrix micro interface of E-glass/PEI laminates, which are made by co-woven and film stacking method. To promote the degradation of the adhesive condition at the fiber/matrix micro interface of laminates with no matrix dissolution loss, hot-wet and thermal spiking tests were carried out. The absorption properties and flexural properties of each laminates were compared.
Consequently the following results were obtained.
(1) Under a hot-wet condition, the degradation of flexural strength of E-glass/PEI laminates is mostly caused by micro interface deterioration, and it is possible to estimate the adhesive condition at the micro interfaces of the laminates by hot-wet test and thermal spiking test.
(2) The adheive condition at the fiber/matrix micro interface of co-woven laminates is better than that of film stacked laminates because of their good impregnation ability.
