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Polybutylene terephthalate (PBT) is extensively used for automobile and aircraft components, which are prone to continuous damage and, thus, are expected to have superior mechanical properties. With the aim of achieving this, carbon nanotube (CNT) reinforced polymer composites are steadily gaining importance. To address this area, the present study deals with the fabrication and characterization of PBT reinforced with multi-walled CNTs (0.1 to 0.5 wt.%) and its effect on tensile strength. The strength of the composite increased at first and later reduced marginally with increasing filler content. A study of fractured surfaces of the composites showed formation of CNT–polymer inflorescence type morphology which indicated that the nanotubes within the polymer matrix act as an anchor for carrying and distributing the load during fracture. This demonstrates appreciable interfacial bonding between polymer matrix and the CNTs.

Inflorescence type morphology and mirror–mist–hackle pattern in tensile fractograph of MWCNT/PBT nano-composites