Carbon fibre reinforced cyclic butylene terephtalate were produced by a low pressure method, the impregnating temperature and the cooling speed were investigated using plate–plate rheometry and differential scanning calorimetry. The effects of low fibre volume fraction of carbon fibre reinforcement (∼20 vol.‐%) on the mechanical properties were examined by tensile and flexural tests and Charpy dynamic impact test. The results showed a significant increase in Young's modulus and ultimate strength and were supported by scanning electron microscopy pictures of the broken surfaces to study fibre wet‐out.
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