To mitigate the membrane stabilities (dimensional and mechanical) and ionic properties, we report well functionalized hydrophilic and hydrophobic (responsible for stabilities) phase separated quaternized anion exchange membrane (AEM). The N,N,N,N-Tetramethyl-1,3-propanediamine quaternized AEM spliced with alkyl chain (DQCP-36) formed self amassed morphology with larger ionic clusters. The most suitable optimized AEM (DQCP-36) demonstrated enhanced hydroxide ion conductivity (4.66 x 10(-2) S cm(-1)), ion exchange capacity (1.35 meq./g) and lower activation energy (11.52 kJ/mol). These AEMs showed self-amassed morphology (well balanced hydrophilic and hydrophobic domain) and excellent stabilities (thermal, alkaline and dimensional). Under harsh alkaline medium (2 M NaOH) at 60 degrees C, DQCP-36 AEM showed about 9% reduction in conductivity after 700 h treatment, and assessment to be a suitable candidate for alkaline fuel cells. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.