Copolymerization of styrene with N-vinyl carbazole in selected organic solvents

✍ Scribed by Anna Ryttel

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 151 KB
• Volume: 67
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980124)67:4<715::aid-app14>3.0.co;2-q

✦ Synopsis

The copolymerization of styrene (St) with N-vinyl carbazole ( N-VC) was carried out in different solvents (benzene, ethyl acetate, acetone, or DMF) using a,aazobisisobutyronitryle as an initiator at 60ЊC. The copolymer compositions were estimated by elemental analysis. The monomer reactivity ratios of styrene ( r 1 ) and N-VC ( r 2 ) were determinated by Fineman-Ross and Kelen-Tu ¨do ¨s methods and then recalculated using a nonlinear minimization algorithm based on the Mayo-Lewis method (RREVM). The reactivity ratios calculated by the RREVM method were found to be r 1 Å 3.74, r 2 Å 0.14 (benzene); r 1 Å 5.02, r 2 Å 0.11 (ethyl acetate); r 1 Å 5.50, r 2 Å 0.16 (acetone); and r 1 Å 5.83, r 2 Å 0.17 (DMF). The Alfrey-Price copolymerization parameters Q 2 and e 2 for N-VC in each solvent were calculated: Q 2 Å 0.51, e 2 Å 01.60 (benzene); Q 2 Å 0.37, e 2 Å 01.57 (ethyl acetate); Q 2 Å 0.24, e 2 Å 01.16 (acetone); and Q 2 Å 0.23, e 2 Å 01.17 (DMF).