Characterization, properties, and processing of LaRC (TM) PETI-5 as a high-temperature sizing material. I. FTIR studies on imidization and phenylethynyl end-group reaction behavior
Dw. Cho et Lt. Drzal, Characterization, properties, and processing of LaRC (TM) PETI-5 as a high-temperature sizing material. I. FTIR studies on imidization and phenylethynyl end-group reaction behavior, J APPL POLY, 76(2), 2000, pp. 190-200
The imidization and phenylethynyl end-group reaction behavior of phenylethy
nyl-terminated imide oligomers (LaRC(TM) PETI-6) with a number-average mole
cular weight of 2500 g/mol has been extensively interpreted in terms of the
disappearance and appearance of several characteristic absorption peaks. M
ost characteristic FTIR absorption bands including the phenylethynyl end gr
oup occurring via imidization and cure during dynamic and isothermal heat t
reatments of LaRC(TM) PETI-6 were clearly resolved and assigned in the pres
ent study. The results give some information on temperature- and time-depen
dency of the cure of LaRC(TM) PETI-5, which may be useful for determining t
he processing conditions necessary for use as a high-temperature fiber-sizi
ng material. This study also measures the extent of imidization and the act
ivation energy of cure reaction of this material. (C) 2000 John Wiley & Son
s, Inc.