The intrinsic viscosity (η) of the synthesized copolymers was determined using Ubbelohde viscometer (K = 0.00323). The samples were dried for 24h using vacuum oven at 45°c and then dissolved in CHCl3 with 0.5 g/100ml over a night. Then the Ubbelohde viscometer was immersed in a water bath at 25°C and the polymer solutions were allowed to flow, and the flow time was recorded in 5 repetitions for each sample. Then the average time was used to determine intrinsic viscosity values using Solomon-Ciuta equation .