Styrene-maleic anhydride copolymers: Synthesis, characterization, and thermal properties

✍ Scribed by Shashi D. Baruah; Narayan C. Laskar

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 590 KB
• Volume: 60
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960502)60:5<649::aid-app1>3.0.co;2-q

✦ Synopsis

Radical copolymerization of styrene and maleic anhydride have been carried out in N,Ndimethylformamide at 60°C using 2,2'-azobisisobutyronitrile as initiator. The copolymer compositions were determined using an aqueous conductometric direct titration method. Monomer reactivity ratios were calculated by Fineman-Ross, Kelen-Tudos, and conversionbased Kelen-Tudos methods. Gel permeation chromatography was used to determine molecular weights and polydispersity indexes. The thermal degradation and energy of activation of the degradation process were determined by several thermogravimetric analysis and differential scanning calorimetric models. The thermal degradation of the copolymer is a two-stage process, the major degradation being the second stage. The copolymer degrades at a lower temperature than polystyrene.