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Estimation of crosslinking of diallyl phthalate prepolymer. An investigation by infrared spectroscopy
Author(s) -
Yoshida Katsunari,
Kamada Harunori,
Kumanotani Ju
Publication year - 1970
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1970.070140819
Subject(s) - prepolymer , phthalate , degree of unsaturation , materials science , polymer chemistry , infrared spectroscopy , monomer , polyurethane , polymer , composite material , chemistry , organic chemistry
The cure of the dially phthalate prepolymer was studied by means of infrared spectroscopy. It was found that the CC stretching band of the allyl group, which appears at 1647 cm −1 in diallyl phthalate monomer, splits into two bands at 1645 and 1651 cm −1 in both of the prepolymers and cured resins derived therefrom, the split band being found to be mostly useful to investigate the highly cured resin system of diallyl phthalate. On the basis of the split band, α is defined as a new parameter expressing a degree of residual unsaturation of diallyl phthalate prepolymers as well as highly crosslinked polymers, as revealed experimentally. Further, α proved to correlate closely with other parameters such as the iodine value measured for the prepolymers, and swelling weight ratio or Barcoal hardness (hot) measured for the cured resins, it becoming evidently a convenient parameter to examine the degree of crosslinking of diallyl phthalate resin system. The effect of metal molds employed upon cure of prepolymers was also elucidated from the measured α values.