| Autor: |
Teator AJ; Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States., Varner TP; Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States., Jacky PE; Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States., Sheyko KA; Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States., Leibfarth FA; Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States. |
| Abstrakt: |
A series of isotactic, semicrystalline vinyl ether copolymers (up to 94% meso diads) were synthesized using a chiral BINOL-based phosphoric acid in combination with a titanium Lewis acid. This stereoselective cationic polymerization enabled the systematic tuning of both glass transition ( T g ) and melting temperature ( T m ) in copolymers derived from alkyl vinyl ethers (i.e., ethyl, butyl, isobutyl). Additionally, a vinyl ether comonomer bearing an acyl-protected alcohol was utilized as a platform for postfunctionalization. Copolymers containing the masked alcohols were shown to undergo deprotection and subsequent coupling with a desired acid chloride. Collectively, these results highlight the diverse material properties and expanded chemical space accessible through stereoselective cationic polymerization mediated by a chiral anion. |
