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Charles E. Carraher
University of South Dakota
59Publications
13H-index
516Citations
Publications 59
Newest
Published on Feb 1, 1978in Journal of Polymer Science Part A 2.59
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Charlene Deremo Reese2
Estimated H-index: 2
(University of South Dakota)
A number of reaction variables in the solution synthesis of lead (IV) polyesters were examined. Both electronic nature of the diacid and lead-containing material is important, with an increase in yield resulting as the nucleophilicity of the salt increases. Diffusion is also an important factor. Reaction is favored by an increase in the concentration of reactants.
2 Citations Source Cite
Published on Aug 1, 1976in Journal of Applied Polymer Science 1.90
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Steven Jorgensen2
Estimated H-index: 2
(University of South Dakota),
Paul J. Lessek2
Estimated H-index: 2
(University of South Dakota)
Oligomeric Group IVA ferrocene Polyesters were synthesized utilizing the interfacial condensation technique. Yield decreases with increasing complexity of the aliphatic substituent; it decreases in the order of I > Br > Cl, and it decreases in the order of Sn > Ge > Si. Thus, initial attack by the nucleophile, steric requirements, and metal—halide bond breakage appear important: Where M = Si, Ge, or Sn.
14 Citations Source Cite
Published on May 20, 1976in Angewandte Makromolekulare Chemie
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Leonard M. Jambaya3
Estimated H-index: 3
(University of South Dakota)
Hafnium polyethers were synthesized utilizing both the interfacial and aqueous solution techniques: Thermal properteis of the polyethers were studied by DSC and TGA analysis. The products exhibit moderate to poor low and high temperature stabilities. Degradation above 200°C occurs via an oxidative mode in air. Hafniumhaltige Polyather wurden auf folgendem Weg durch Grenzflachenpolykondensation und durch Polykondensation in Losung dargestellt: Die thermischen Eigenschaften der Polyather wurden du...
14 Citations Source Cite
Published on Aug 26, 1976in Angewandte Makromolekulare Chemie
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Mary F. Feddersen2
Estimated H-index: 2
(University of South Dakota)
Modification of poly(ethylene imine) with tin-containing reactants was effected utilizing the interfacial technique. Products from dihalo reactants are crosslinked while products from monohalo reactants are linear and soluble containing from about 30 to 90% inclusion of the tin-moiety. Yield maximized about one minute stirring time and decreases at higher stirring times because of heat buildup. Die Modifizierung von Polyathylenimin wurde durch Kondensation mit Zinnverbindungen unter Anwendung de...
5 Citations Source Cite
Published on Aug 5, 1975in Angewandte Makromolekulare Chemie
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Dale R. Burger3
Estimated H-index: 3
(University of South Dakota)
Polyphosphonylureas were prepared from the condensation of phenylphosphonic diisocynate with secondary and primary diamines employing the interfacial technique. The thermal properties of the products were studied by differential scanning calorimetry and thermal gravimetric analysis. In air the products undergo thermal oxidative degradation at temperatures greater than 300°C. The products undergo identical thermal degradation at temperatures less than 300°C in both air and N2. The products show s...
5 Citations Source Cite
Published on May 1, 1975in British Polymer Journal
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Samuel T. Bajah3
Estimated H-index: 3
(University of South Dakota)
Synthesis of titanium polyethers was effected via four low temperature polycondensation routes, namely the “normal” interfacial, “inverse” interfacial, aqueous solution and organic solution techniques. The greatest yields were obtained through use of the aqueous solution technique while no or small yields resulted from organic solution systems. Both sodium hydroxide and triethylamine proved to be satisfactory bases. No product was formed when base was not added. Results as a function of base con...
18 Citations Source Cite
Published on Jan 1, 1974in Journal of Applied Polymer Science 1.90
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Robert J. Nordin3
Estimated H-index: 3
(University of South Dakota)
Synthesis of zirconium oligomeric polythioethers was effected using aqueous solution and interfacial techniques: The products are insoluble in all tried solvents and possess ZrOH endgroups but no detectable quantities of RSH, ZrCl, or ZrNEt-endgroups.
10 Citations Source Cite
Published on Sep 1, 1974in British Polymer Journal
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Ronald A. Frary3
Estimated H-index: 3
(University of South Dakota)
Reaction variables of the interfacial condensation of Cp2TiCl2 with diamidoximes is presented. At 1:1 Cp2TiCl2: diamidoxime ratios and less the product is found to contain predominately units of form I. It is tentatively concluded that the disubstituted product, form II, is formed at Cp2TiCl2:diamidoxime ratios > 1. Sodium hydroxide and triethylamine are both found to be adequate added bases for the reaction. High concentrations of Cp2TiCl2 and low concentrations of diamidoxime favour a more rap...
7 Citations Source Cite
Published on Aug 1, 1974in Macromolecular Chemistry and Physics 2.49
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Ronald A. Frary3
Estimated H-index: 3
(University of South Dakota)
Bis(η-cyclopentadienyl)titanio derivatives of poly(amide oxime)s (3) were synthesized via the condensation of amide oximes (1a–g) with (Cp)2TiCl2 (2) utilizing both the interfacial and solution techniques. The reaction was found to be rapid, occuring in generally less than 90s and to increase with the stirring rate in the region of 8000 to 24 000rpm but with yield remaining constant above 12 000rpm. Bis(η-cyclopentadienyl)titan-Derivate von Polyamidoximen (3) wurden aus (Cp)2TiCl2 und verschiede...
8 Citations Source Cite
Published on Apr 1, 1974in Journal of Polymer Science Part A 2.59
Charles E. Carraher13
Estimated H-index: 13
(University of South Dakota),
Ronald A. Frary3
Estimated H-index: 3
(University of South Dakota)
Synthesis of zirconium poly-O-amidoximes was affected by using both interfacial and aqueous solution techniques. Reaction is rapid. The yield for the synthesis of analogous titanium product is Cp2ZrCl2 > Cp2TiCl2 which is consistent with that predicted by the hard-soft acid–base theory.
5 Citations Source Cite
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