ABSTRACT
Polytetrahydrofuran (PTHF) is an elastomer with the repeat unit [-cH2CH2CH2CH2G-]0 • It cannot be prepared usefully by the free radical methods commonly used to prepare many commercial polymers. Instead, cationic ring-opening polymerization methods must be used (Dreyfuss, 1982; Inoue and Aida, 1984; Penczek et al., 1985; Dreyfuss et al., 1989; Pruckmayr et al., 1996).
