Influence of fiber length and compatibilizer on mechanical properties of long glass fiber reinforced polyamide 6,6

The influences of the glass fiber content and initial length on the mechanical properties of long glass fiber reinforced nylon 66 (LGF-PA66) were investigated, and then the appropriate glass fiber content (30%) and initial glass fiber length (10 mm) were determined to study the effect of three kinds of compatibilizers (maleic anhydride grafted polypropylene (PP-g-MAH), maleic anhydride grafted polyolefin elastomer (POE-g-MAH) and maleic anhydride grafted ethylene propylene diene monomer (EPDM-g-MAH)) on the mechanical properties of the LGF-PA66 composites. It is found that a maximum tensile strength is reached for the composites when any of the different compatibilizers are 2.5 wt%. However, the influence of PP-g-MAH on the impact strength of composites is different from the others. Tensile strength and notched impact strength models were applied to interpret the experimental results of the mechanical properties.