By J. C. Salamone, J. S. Riffle (auth.), J. C. Salamone, Judy S. Riffle (eds.)
of Polymer Chemistry, Inc. of the yank Chemical Society held its The department fifteenth Biennial Polymer Symposium at the subject, "Advances in New Materials," November 17-21, 1990, on the Pier sixty six hotel and Marina in feet. Lauderdale, Florida. a 3 and one part day software used to be offered through famous leaders in significant parts of latest polymeric fabrics. the themes of the Biennial Symposium integrated new excessive functionality polymers, polymers for digital functions, electrically undertaking polymers, nonlinear optics, new polymer structures, and polymers derived from organic media. those are the topic parts of this quantity of "Contemporary themes in Polymer Science". The cause of the Symposium used to be to target fresh advances in polymeric fabrics. The technical periods have been complemented by way of an preliminary poster consultation which augmented many of the technical classes. a selected spotlight of the assembly was once the presentation to Professor Michael Szwarc of the 1990 department of Polymer Chemistry Award by way of Dr. J. L. Benham, Chairman of the T Aymer department. in the course of his Award deal with, Professor Szwarc defined how he had develop into a polymer chemist and later constructed "living polymers." indubitably, Professor Szwarc has made a profound contribution to the polymer box, which has yielded many new varieties of residing polymerization.
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Mehta, Parag. G. Proc. Polym. Mat. Eng. Sci. 1990, 62, 351. Moore, J. ; Kim, Ji-Heung; Seidel, Peter R Chem. Mat. , in press. Moore, J. ; Kim, Ji-Heung Macromolecules. submitted for publication. Moore, J. ; Mehta, Parag. G. Macromolecules 1988, 21, 2644. PERFECTLY ALTERNATING SEGMENTED POL YIMIDE SILOXANE COPOLYMERS M. E. Rogers, D. Rodrigues, A. Brennan*, G. L. Wilkes and J. E. McGrath** Departments of Chemistry and Chemical Engineering NSF Science and Technology Center: High Performance Polymeric Adhesives and Composites Virginia Polytechnic Institute and State University Blacksburg, Virginia 24061-0212 ABSTRACT Perfectly alternating segmented, fully cyclized, polyimide siloxane copolymers were synthesized and characterized as new materials.
However, the triethylamine methylenes remained unresolved even when very dry conditions were used. Furthermore, the presence of excess triethylamine did not significantly increase the resolution. At present, we have no rationale to explain the peak broadening other than some unknown type of complexation of the amine with the chloroformate or with the acyl ammonium salt The other amines listed in Table 1 also displayed unique resonances in the NMR. Although no acyl ammonium salt was observed for the very hindered N-ethyl diisopropylamine (entry 12), peak broadening of the methylene protons and the methine protons was again observed.
40 Amine Catalyst Concentration (moles/L) Figure 1. Concentration dependence of tertiary amines. 10 + (1) If so, an equilibrium mixture of the acyl ammonium salt and the starting materials would exist, and the relative proportions in solution would depend on the concentration of the 26 reagents and the nature of the particular amine. In fact, HI NMR can be used to easily distinguish unreacted triethylamine from the corresponding acyl ammonium salt. In addition, ethyl chloride and the urethane that results from the decomposition of the acyl ammonium salt can also be differentiated from the other species present.