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Determination of thermal cure kinetics of thin films of photocatalysed dicyanate ester by FTIR emission spectroscopy
Author(s) -
Liu Heping,
George G A
Publication year - 2000
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/1097-0126(200011)49:11<1505::aid-pi546>3.0.co;2-h
Subject(s) - fourier transform infrared spectroscopy , cyanate ester , cyanate , catalysis , kinetics , polymerization , polymer chemistry , materials science , activation energy , reaction mechanism , thermal stability , manganese , photochemistry , thermogravimetric analysis , infrared spectroscopy , cyclopentadienyl complex , chemistry , polymer , chemical engineering , organic chemistry , composite material , physics , quantum mechanics , engineering , epoxy
Emission Fourier transform infrared (FTIR) spectroscopy has been found to be a suitable technique for monitoring the thermal cure of thin films of photocatalysed dicyanate ester resins. The kinetics of the polymerization of a commercial cyanate ester resin (AroCy RTX‐366) catalysed by an organometallic compound, tricarbonyl cyclopentadienyl manganese (CpMn(CO) 3 ), have been determined using this technique and the results compared with those obtained from transmission FTIR. The trimerization reaction rate of the resin is found to have a first order dependence upon both the cyanate fraction and the active catalyst concentration until diffusion control occurs. To elucidate the mechanism, a system with premade catalyst, which was the photoreaction product of the resin and the organometallic compound, has also been studied. The activation energy for this system is 91 ± 10 kJ mol −1 compared to 72 ± 8 kJ mol −1 for the directly irradiated system. This may arise from different distributions of three photoproducts identified as complexes between manganese and the cyanate ester. © 2000 Society of Chemical Industry