SynopsisLow molecular weight components of both an acid-polymerized and a 7-alumina polymerized furfuryl alcohol polymer were separated by gas chromatography utilizing a Porapak type P-S column packing. The identities of the separated polymer components were established by infrared spectroscopy, mass spectrometry, and nuclear magnetic resonance analysis. Volatile constituents found to be common to both furfuryl alcohol resin types were: furfuryl alcohol, water, difurylmethane, difurfuryl ether, and 2,5di-furfurylfuran. Also, 5-furfurylfurfuryl alcohol was found to be present only in the acidpolymerized resin, and 4-furfuryl-2-pentenoic acid r-lactone was a constituent only of the 7-alumina-polymerized resin. Contrary to expectation, no esters of levulinic acid were found among the low molecular weight components of the 7-alumina-polymerized furfwyl alcohol polymer. INTRODUCTIONE'urfuryl alcohol polymers are thermosetting resins which have been utilized as binder, coating, and impregnating materials. I n addition to exhibiting excellent heat and chemical resistance when cured, furfuryl alcohol polymers also produce relatively large amounts of carbon when subjected to high-temperature pyro1ysis.l These properties account for the more recent use of furfuryl alcohol resins as binder materials in the manufacture of nuclear-grade graphite. Our interest in the development of improved furfury1 alcohol resin-bonded graphite has led us to further studies of the chemical and physical properties of the resins used in graphite fabrication.The polymerization of furfuryl alcohol is accompanied by many side reactions which, from a chemical point of view, result in the formation of a heterogeneous product. Thus, to attempt an understanding of the behavior of these polymers when used as graphite binder materials, it is necessary to have some knowledge about their chemical composition.As it is experimentally difficult to isolate the larger molecules present in furfuryl alcohol polymers, it was decided that by separating and identifying the low molecular weight components of these polymers, much information concerning the chemical composition of the polymers as a whole could nonetheless be gained. Of course, the assumption must be made that the com- 1438 WEWEHKA, LOUGHKAN, AND WALTEHSposition of the entire polymer is reflected in the composition of its more volatile components. In fact, the low molecular weight components of furfuryl alcohol resins are likely to be of particular importance to us. A recent study concerning the effects of the molecular-size distributions of furfuryl alcohol polymer binders on the properties of graphites made from them2 indicated that the behavior of these binder materials is determined largely by the amount of lower molecular weight constituents present in the polymer. Experimentally, the task of isolating the volatile components of furfuryl alcohol polymers in amounts suitable for further characterization appeared to be well suited to gas chromatography techniques.Furfuryl alcohol polymers are usual...
ABSTRACT\samples of six explosive c a m s (TNT, tetryl, NC, RCIX, W, I Pmn) and four e q l o s i v e mixtures were exposed to the neutron (and gamma) radiation f'ra a parer reactor a t integrated flux 1-1s of approximately l0'5 n/Cmo2 (5 x 10 re), ami 3 x d6 n/cm.* (2 x 10 r . In t h i s paper we present tho results of a pre1hiumu-y study of the effects of the comblned neutron and gcusma mdlatlon from a power reactor on ten organic explosive colPpounds eupd r&diures. RDX as a reaction by-product.-2-Tetryl -2,4,6-'Prinitrophenylm?thyUt~ne, uniform spherical granules, average particle size about 0.5 m.-
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