Abstract
A precision polyethylene containing phenyl branches at every fifth carbon (p5Ph) is nearly quantitatively functionalized (≈95%) with sulfonic acid groups on the para-position of each phenyl branch (p5PhS-H). Unlike polystyrene sulfonate (PSS), p5PhS-H has a glass transition temperature (Tg = 109 °C) well below its thermal decomposition temperature (Td ≈ 200 °C), making this new material capable of thermal processing into molds and films at temperatures between these thermal limits. Neutralization of the sulfonic acid groups with varying counter cations (Li+ , Na+ , Cs+ ) produces a new class of precision polyelectrolytes. Neutralization and increasing size of the counter cation improves the thermal decomposition temperature (Td ) to over 400 °C for the Cs+ form. Neutralization causes Tg to increase above Td for the Li+ and Na+ form. The Cs+ form is found to have an accessible Tg = 294 °C. Further investigations of water absorption and the polyelectrolyte effect of these systems are discussed.
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