@article {3336,
	title = {SYNTHESIS AND CHARACTERIZATION OF POLYFUNCTIONAL CROSS-LINKING AGENTS FOR CYANATE RESINS},
	journal = {Journal of Polymer Science Part a-Polymer Chemistry},
	volume = {33},
	number = {8},
	year = {1995},
	note = {ISI Document Delivery No.: QX924Times Cited: 9Cited Reference Count: 13},
	month = {Jun},
	pages = {1191-1202},
	type = {Article},
	abstract = {An efficient crosslinking monomer for a mixed cyanate/epoxy resin system, bisphenol-A-monocyanate monoglycidyl ether 3, has been synthesized and characterized. The intermediate compound, the monoglycidyl ether of bisphenol-A 2, was also isolated and purified by extraction and chromatographic separation using a silica gel column. The cyanate functional group in the crosslinking monomer 3 can be cured easily by heat to form a triazine structure 8, but the epoxy functional group in the crosslinking monomer 3 can not be cured without affecting the cyanate group because the latter is more reactive both under heat and basic conditions. A practical approach for the application of the crosslinking monomer 3 is discussed and tested. Most interestingly, under heat curing, a very tough and strong resin material was produced from this crosslinking mixed resin mixture. By using a secondary amine, diethylamine, as a curing agent, the cyanate groups in the crosslinking monomer 3 react to form the structures 11 or 12, depending on the molar ratio of monomer 3 to diethylamine. A bifunctional crosslinking agent for a mixed cyanate (thermoset) and polyolefin (thermoplastic) resin system, 8-allylphenyl cyanate 16, has also been synthesized and characterized. Like 3, 2-allylphenyl cyanate 16 easily forms the crosslinking triazine compound 17 upon heating. 17 is a crystalline solid with mp = 110-111 degrees C. As a crosslinking agent, 8-allylphenyl cyanate 16 reacts not only with itself, but also with other cyanates to form heterogeneous triazine rings, exemplified by triazines 18 and 19. Even though it does not self polymerize through the allyl double bond, it can copolymerize with an other olefinic monomer, such as methyl methacrylate, to form a crosslinked and insoluble polymer. (C) 1995 John Wiley and Sons, Inc.},
	keywords = {C-13-NMR, CROSS-LINKING AGENTS, CYANATE RESIN, EPOXY RESIN, H-1-NMR, N-15-NMR, POLYOLEFIN},
	isbn = {0887-624X},
	url = {<Go to ISI>://A1995QX92400001},
	author = {Fyfe, C. A. and Niu, J. and Mok, K.}
}
@article {3041,
	title = {NMR INVESTIGATIONS OF THE POSSIBLE CROSS-REACTIONS BETWEEN CYANATE AND EPOXY-RESINS},
	journal = {Journal of Polymer Science Part a-Polymer Chemistry},
	volume = {32},
	number = {12},
	year = {1994},
	note = {ISI Document Delivery No.: PC784Times Cited: 25Cited Reference Count: 11},
	month = {Sep},
	pages = {2203-2221},
	type = {Article},
	abstract = {The possible cross reactions indicated by solid-state NMR between cyanate functionalized resin and epoxy functionalized resin have been investigated by using both natural abundance and labeled monofunctional model compounds. These soluble products were isolated and purified by silica gel adsorption chromatography and gel permeation chromatography. They were fully characterized by high resolution H{\textendash}1, C{\textendash}13, N-15-NMR spectroscopy and by mass spectrometry. The major cross-reaction product is a racemic mixture of enantiomers, which contain an oxazolidinone ring formed by one cyanate molecule and two epoxy molecules. However, epoxy consumption lags cyanate consumption in the overall reaction as triazine formation from the cyanate is much faster than the two competing reactions, the cross reaction between cyanate and epoxy, and the self-polymerization of epoxy, under the conditions investigated. The cross reaction between cyanate and epoxy is limited. Approximately 12\% of cross reaction between cyanate and epoxy was found in the overall reaction. In addition to the cross reactions of epoxy and cyanate, the reactions of epoxy and the carbamate, which is the major side product for the curing reaction of cyanate resin in solution, have also been investigated, and the mechanism of these reactions discussed. From the reactions of epoxy and carbamate, several products related to cross reaction between epoxy and cyanate have been isolated and identified. It is suggested that the reaction of epoxy and carbamate is one of the pathways in the overall cross reaction between epoxy and cyanate resins. Finally, the mechanism of the overall cross-curing reaction between the diepoxy and dicyanate mixed resins is discussed. (C) 1994 John Wiley \& Sons, Inc.},
	keywords = {AND H-1-NMR, C-13-NMR, CARBAMATE, CROSS REACTION, CURING, CYANATE, EPOXY, MIXED RESINS, N-15-NMR, OXAZOLIDINONE},
	isbn = {0887-624X},
	url = {<Go to ISI>://A1994PC78400001},
	author = {Fyfe, C. A. and Niu, J. and Rettig, S. J. and Wang, D. W. and Poliks, M. D.}
}
