Multicyclic Poly(ether ketone)s Obtained by Polycondensation of 2,6,4‘-Trifluorobenzophenone with Various Diphenols
作者:Hans R. Kricheldorf、Radka Hobzova、Lali Vakhtangishvili、Gert Schwarz
DOI:10.1021/ma050037+
日期:2005.5.1
2,6,4‘-Trifluorobenzophenone (TFB) was polycondensed with silylated 4,4‘-dihydroxybiphenyl (DHBP) or silylated bisphenol A in N-methylpyrrolidone by means of K2CO3 as catalyst and HF acceptor. At constant concentration (0.08 mol/L) the feed ratio was varied from 1.0/1.0 to 1.0/1.5. For polycondensations of DHBP cross-linking was observed for feed ratios above 1.0/1.1, whereas no gelation occurred with