Authors : Ranjana Sharma, Purnima Jain and Prabhat K Upadhyay
Page Nos : 11-15
Description :
This paper explains the rheological behaviour of impact modified PBT/PTT blends based nanocomposites. Impact modified PBT/PTT blends based nanocomposites have been prepared by melt blending. ULDPE-g-GMA was used as an impact modifier for PBT and PTT polymeric matrix. It has been observed from results that the storage modulus, loss modulus and complex viscosity of the nanocomposites increased with the incorporation of organoclay (OMMT). Addition of organoclay to polymer matrix increased the storage modulus by several orders of magnitude and alters the shear thinning behaviour at low frequencies. Compositions having 5 wt % of organoclay shows high value of the storage modulus, loss modulus and complex viscosity. Moreover, storage modulus (G’) and loss modulus (G”) of impact modified 25/75 PBT/PTT (NA3) and 50/50 PBT/PTT (NB3) blends based nanocomposites with 5 wt % organoclay loading increased more significantly at lower frequency range relative to other compositions. PBT/PTT blends based nanocomposites followed a strong shear thinning flow behaviour and decreased with increasing shear rates or frequency. This change in behaviour showed a solid like behaviour and it is related to the morphological changes. The Complex viscosity of neat PBT, neat PTT and impact modified PBT and PTT decreased with increasing frequency because of the shear thinning behaviour. The morphology of PBT/PTT blends and its nanocomposites has been confirmed by FEG-SEM microscopy.
Keywords: PBT, PTT, Blends, Nanocomposites, Rheology, Morphology
