The Tg values of the MM-PIM samples were nearly 9.5 C greater than those of the PIM samples. The increment in the MM-PIM glass point revealed an improvement in the thermal stability of the membrane due to the presence of covalent bonding between the carbon nanotubes with the membrane polymer chains. The covalent bonds subsided the free volume and motility of the polymer chains, increasing the Tg values of the membranes [59,60].
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