| 초록 |
Hyperbranched poly(arylene ether sulfone)s (HPES) were prepared from 4,4'-difluorophenylsulfone (A2) and 1,1,1-tris(4-hydroxyphenyl)ethane (B3). The structure of the hyperbranched polymers was confirmed with 1H-NMR, 13C-NMR spectroscopy, and MALDI-TOF mass spectrum. Intramolecular cyclization during the polymerization played a key role in this polymerization. The initial gel-inducing species in A2 and B3 polymerization were continuously cyclized during the polymerization and high molecular weight hyperbranched polymer was formed without gelation when the concentration was properly controlled. The polymers showed highly branched structure elucidated from both the high degree of branching (DB = 0.46-0.56) and the low shape factor (α = 0.35) compared to the linear analogue. Hyperbranched poly(arylene ether sulfone) showed good solubility in various aprotic polar solvents and high thermal stability up to 400oC. The detailed mechanical and structural characteristics of this A2 + B3 polymerization will be discussed in comparison with the AB2 polymerization for the conventional hyperbranched polymer synthesis. |
