We describe the synthesis of a series of poly(styrene-block-4-vinylbenzyl(alkyl)imidazolium bis(trifluoromethanesulfonyl)imide) (PS-b-PVBn(alkyl)ImTFSI; alkyl = CH3 (Me), C4H9 (Bu), C6H13 (Hex)) diblock copolymers (2.7�17.0 mol % POIL) derived from nitroxide-mediated block copolymerizations and post-synthetic functionalization reactions. The solid-state morphology of these PS-block-PVBn(alkyl)ImTFSI copolymers were studied using a combination of temperature-dependent synchrotron small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). Lamellar samples having similar polymer compositions exhibit comparable values of conductivity (0.1 mS cm-1 at 150 �C) regardless of the alkyl substituent. The ionic conductivity of a compositionally varied series of PS-block-PVBnHexImTFSI diblocks depends nonlinearly on POIL composition (0.01 mS cm-1 for 8.6 mol % POIL and 0.1 mS cm-1 for 17.0 mol % POIL at 150 �C), highlighting the influence of morphology on the observed ionic conductivity of POIL block copolymers for the first time. These studies indicate that macroscopic connectivity and morphological defects strongly affect the observed conductivities.

Nanostructured polymerized ionic liquid block copolymers

243rd National Meeting (2012)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.