This research and development programme is direc ted at producing a family of new energy absorbing composite materials, utilising a thermoplastic matrix, a range of reinforcement materials and new energy conserving processing techniques. The objectives of the project can be summarized as follows: Development of a structural RIM nylon system, using either discrete fibre reinforcement or replaced mat or roving. Characterization of the mechanical properties of the most promising systems, and the generation of engineering design data. Detailed study of processing structure-property relationships in these materials with particular emphasis on impact behaviour and fracture toughness and related studies of the interface. Evaluation of long-term dimensional stability, and fatigue behaviour together with an evaluation of environmental resistance. As a result of this programme an engineering data bank will be made available which would enable the designer to select material for a particular type of loading situation.
The results were: development of a structural RIM (SRIM) nylon system using glass mat reinformcement; characterisation ofthe mechanical properties of the most promising systems and the generation of engineering design data;
deterioration of the tensile strength of the composites is mainly due to the water induced plasticization effect at the interface between fibres and the matrix and due to destruction of polymer polymer hydrogen bonds. The changes in the strength, thermal behaviour and crystalline and morphological structures in these desiccated samples, particularly in those with higher fibre contents, are related to chemical modifications and physical aspects due to the sorption and desorption.
Funding SchemeCSC - Cost-sharing contracts