By J. C. Salamone, J. S. Riffle (auth.), J. C. Salamone, Judy S. Riffle (eds.)
of Polymer Chemistry, Inc. of the yankee 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 lodge and Marina in toes. Lauderdale, Florida. a 3 and one part day software used to be awarded by means of famous leaders in significant parts of recent polymeric fabrics. the themes of the Biennial Symposium incorporated new excessive functionality polymers, polymers for digital functions, electrically engaging in polymers, nonlinear optics, new polymer platforms, and polymers derived from organic media. those are the topic components of this quantity of "Contemporary themes in Polymer Science". The rationale of the Symposium was once to target contemporary advances in polymeric fabrics. The technical periods have been complemented via an preliminary poster consultation which augmented a number of the technical classes. a selected spotlight of the assembly used to be 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 handle, Professor Szwarc defined how he had turn into a polymer chemist and later built "living polymers." indisputably, Professor Szwarc has made a profound contribution to the polymer box, which has yielded many new kinds of dwelling polymerization.
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Extra resources for Advances in New Materials
Thus, any acyl ammonium salt which does form should be more reactive, and should be indiscriminating in its subsequent reaction with water, hydroxide or phenoxide. Nonetheless, an acyl ammonium salt must form because reaction occurred. Results with pyridine are probably not the result of a change in mechanism to acid-base chemistry, since 2-methylpyridine, which is a somewhat stronger base than pyridine, does not react at all. The fact that pyridine reacts, yet is a far weaker base than the hindered amines mentioned earlier, seems to further preclude acid-base chemistry as the source of these results.
18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 46 (d) Jensen, J. In Polymers for High Technology: Bowden, M. ; Turner, S. ; ACS Symposium Series 346; American Chemical Society: Washington, DC,1987; p 466. ; Miyadera, Y. In Polymers for Electronic Applications: Feit, E. ; Wilkins, C. ; ACS Symposium Series 184; American Chemical Society: Washington, DC, 1982; p 123. Khanna, D. ; Mueller, W. H. In Proceedings of the 3rd International SAMPE Electronic Materials and Process Conferences: Los Angeles, CA, 1989; P 905.
49 o 0 o 0 O»O~O + ODPA ! BisP NMP 0-NH:z + H~-o-t-o+ONH:z ~ Nr2AP _25°C 20% solids POL VAMIC ACID NMPIDCB 8:2 165'C Q-/~;:cr0-cr:~ 0' H n\ N-Q I F\ I O~X \0 H Scheme 2. Polyimide Oligomer Synthesis 3. RESULTS AND DISCUSSION The synthesis of the polyimides (PI) is illustrated in Scheme 2. The polymerizations were conducted in a single "one pot" reactor, which minimizes solution transfer steps. 7 ppm, see Figure 1. Table 1 shows the comparison of the theoretical