Tetraphenylethane iniferters: Polyurethane-polystyrene multiblock copolymers through “living” radical polymerization

✍ Scribed by K. Tharanikkarasu; Ganga Radhakrishnan

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 279 KB
• Volume: 66
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19971121)66:8<1551::aid-app16>3.0.co;2-6

✦ Synopsis

Toluene diisocyanate-based polyurethane iniferters containing tetraphenylethane groups in between polyurethane blocks were prepared by the reaction of isocyanate-terminated prepolymers and 1,1,2,2-tetraphenyl-1,2-ethanediol. When these iniferters were decomposed in the presence of styrene, polyurethane-polystyrene multiblock copolymers were obtained through a ''living'' radical mechanism. The effect of changing polyol on the T g , thermal stability, and molecular weight of polyurethane iniferters as well as block copolymers was studied. The molecular weight of the block copolymers increased with increasing both polymerization time and conversion.