Synthesis and insight into the material properties of polyolefins with isotactic branches outside the two-carbon periodicity has been a long withstanding challenge. Ring-opening metathesis polymerization (ROMP) has brought new opportunities to explore the properties of such materials. Recent reports have shown that bulky, stereospecific, allylic cycloolefins have the potential to produce precise, isotactic polymer microstructures. This presentation will discuss our success in using bulky trialkylsiloxy cyclopentenes to afford regioregular isotactic polymers with a hydroxyl functionality on every fifth carbon. These materials can be likened to an isotactic ethylene-vinyl alcohol copolymer with precision and stereopure alcohol branches. The thermal and semi-crystalline properties are examined to understand the effects of diverse tacticity on these precision polymers.

Synthesis and properties of precision, isostatic ethylene-vinyl alcohol polymers outside of a two carbon spacing

ACS Fall 2021

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