Binary blends of poly (ether sulphone) (PES) and Nylon-6 were prepared in a whole range of composition by melt extrusion.
Miscibility behaviour of the blends were studied using thermal analytical techniques like differential scanning calorimetry
(DSC) and dynamic mechanical analysis (DMA). Due to the rapid crystallization of Nylon-6 as it is cooled from the melt state,
its glass transition behaviour could not be detected even in the quenched samples by DSC. Furthermore, the crystallization
and melting behaviour of the blends have been studied by DSC. DMA results show that the dynamic storage modulus of the blends
were in-between those of the constituent polymers. Also the glass transition of Nylon-6 phase as determined by the peak in
loss tangent remains constant which shows that the two polymers are immiscible. Thermal expansion coefficient of the blends
as determined by TMA is greater than that of Nylon-6 signifying the increased dimensional stability of the blends at higher
temperatures. Morphological studies done by scanning electron microscopy (SEM) show the biphasic nature of the blends, with
clear cut boundaries between the phases because of poor interfacial adhesion. Dispersed particle size is small when Nylon-6
is the dispersed phase because of its lower melt viscosity as compared to PES. Thermal stability of the blends was measured
using thermogravimetric analysis (TG). Two-step decomposition behaviour was observed because of macro-phase separated morphology.