Stephen Neal Falling
Eastman Chemical Company
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Featured researches published by Stephen Neal Falling.
Journal of Macromolecular Science, Part A | 1997
S. Richard Turner; Stephen Neal Falling; Richard W. Blevins
Abstract 3,4-Epoxy-1-butene (I), prepared by the selective oxidation of butadiene, is an unusual difunctional monomer containing polymerizable vinyl and epoxy groups. As expected, free radical homopolymerization of I and its cyclic ketal derivatives was found to be very sluggish, as expected, for the allylic monomer structures. However, I was found to form alternating copolymers with maleic anhydride with both 1,2- and 1,5- enchainment observed. The structures of the alternating copolymers were observed to be solvent dependent with the in situ formation of cyclic ketals and their incorporation into the copolymers in polymerizations done in ketone solvents. Various cyclic ketal monomers derived from I readily formed alternating copoymers with maleic anhydride. Thermally activated self-crosslinking of these resins was observed.
Journal of Macromolecular Science, Part A | 2001
Marco Sangermano; Stephen Neal Falling; James V. Crivello
The photopolymerization of 3,4-epoxy-1-butene (1) was investigated using Fourier transform real-time infrared spectroscopy (FT-RTIR). The effects of photoinitiator structure and concentration and light intensity on the photopolymerization were investigated. Compared to related epoxide monomers, 1 was shown to be more reactive and this was ascribed to stabilization of the growing cationic chain end by the double bond during the ring-opening polymerization. Epoxide 1 was also shown to be useful as a reactive diluent in the photopolymerization of multifunctional epoxides and was observed to accelerate the polymerization of less reactive epoxy monomers.
Journal of Macromolecular Science, Part A | 2002
Marco Sangermano; Stephen Neal Falling; James V. Crivello
ABSTRACT The use of poly(3,4-epoxy-1-butene) (polyEPB) in photoinduced free radical polymerizations has been investigated. It was observed that the inclusion of polyEPB into these photopolymerizations has several beneficial effects. In combination with aromatic ketones, polyEPB functions as a hydrogen donor to form a highly effective photoinitiator for the polymerization of acrylate monomers. At the same time, polyEPB undergoes facile autoxidation that serves to mitigate inhibition effects due to oxygen during free radical photopolymerizations. PolyEPB is an effective chain transfer agent that tends to increase both the rate and conversion in photoinduced crosslinking polymerizations in which multifunctional monomers are employed. Lastly, polyEPB is a interesting matrix-modifying agent that becomes incorporated into the resin matrix during photopolymerization due to photoinduced grafting reactions.
Journal of Macromolecular Science, Part A | 2002
Marco Sangermano; Stephen Neal Falling; James V. Crivello
ABSTRACT Hydroxyl-terminated poly(3,4-epoxy-1-butene) (polyEPB) is an interesting and highly useful agent for the acceleration of the photoinitiated cationic ring-opening polymerization of epoxide monomers. Kinetic investigations using real-time infrared spectroscopy have shown that the observed acceleration of the polymerization is due to two independent mechanisms. Crosslinking polymerization of epoxide monomers is accelerated due to an activated monomer mechanism that results in facile chain transfer due to interaction of the terminal hydroxyl groups of polyEPB with the growing oxonium ion chain ends. A second mechanism involving participation of polyEPB in a free radical chain induced decomposition of the onium salt photoinitiator is mainly responsible for the observed acceleration in the rate of polymerization. A large number of polymer-bound carbocationic species are generated by this mechanism that are capable of initiating polymerization of the epoxide monomer.
Journal of Organic Chemistry | 1990
Kevin J. Edgar; Stephen Neal Falling
Archive | 2000
Michael John Cyr; Horst Clauberg; Mark Edward Stewart; Stephen Neal Falling; Martin Emerson Rogers
Journal of Organic Chemistry | 1980
Stephen Neal Falling; Henry Rapoport
Archive | 1992
Gerald Wayne Phillips; Stephen Neal Falling; Stephen A. Godleski; John R. Monnier
Archive | 2008
Robert L. Clayton; Stephen Neal Falling; Jeffrey Scott Kanel; Calvert C. Churn
Archive | 2008
Robert L. Clayton; Stephen Neal Falling; Jeffrey Scott Kanel