Abstract
Two styrenic DABCO salt monomers allowed the synthesis of DABCO salt-containing random copolymers with two quaternized nitrogen cations on each ionic pendant group. Triethyl-(4-vinylbenzyl)ammonium chloride (VBTEACl) containing random copolymers served as singly charged controls. DABCO salt-containing copolymers with 20 mol % or lower ionic contents exhibited microphase-separated morphologies, agreeing with the multiplet-cluster model for random ionomers. Thermomechanical and morphological analyses revealed that doubly charged DABCO salts promoted more well-defined microphase-separation than singly charged analogues. Stronger ionic association of DABCO salts compared to trialkyl ammoniums resulted in superior thermomechanical and tensile properties of DABCO salt-containing ionomers. The doubly charged copolymers exhibited less water uptake per charge than the singly charged analogues. Anion exchange of the halides to more hydrophobic anions led to enhanced thermal stability, increased phase-mixing, and re...
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