Multi-arm star-branched polyisobutylene ionomers |
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Authors: | Robson F Storey Kelly A Shoemake |
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Affiliation: | (1) Department of Polymer Science, The University of Southern Mississippi, Box 10076, Hattiesburg, MS 39406, USA, US |
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Abstract: | A series of multi-arm star-branched polyisobutylenes was synthesized via living carbocationic polymerization. Arms with molecular weights ranging from 10,000 to 30,000 g/mol were prepared using
the cumyl chloride/TiCl4/pyridine initiation system in 60/40 (v/v) hexane/methyl chloride at − 80 °C and linked by sequential addition of divinylbenzene.
The weight average number of arms per star polymer, N
w, scaled inversely with arm molecular weight and ranged from 32 to 5. Star-telechelic ionomers were produced by sulfonation
of the aromatic initiator residue at the end of each arm, followed by neutralization. Sulfonation was quantitative as indicated
by acid-base titration. Potassium ionomers were elastic solids which were marginally soluble in THF; the precursors were tacky
and freely soluble in THF. Ionic modification did not alter the glass transition temperature (− 66 °C), but the thermal decomposition
temperature in N2 was increased from 375 to 400 °C.
Received: 25 July 1997/Accepted: 27 August 1997 |
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