Results 131 to 140 of about 888 (170)

Thermoplastic polyheterocycles. I: Polyalkylene‐benzoxazoles

Polymer Engineering & Science, 1994
AbstractPolyalkylenebenzoxazoles of high molecular weight (inherent viscosity values from 0.76 to 2.95) were prepared from 4,6‐diaminoresorcinol dihydrochloride and aliphatic diacids in polyphosphoric acid by heating at 180 to 200°C for 3–5 h. Melting points of the polymers ranged from 148 to 423°C, depending on the length of the alkylene chain.
J. Preston, Y. Tropsha, J. W. Trexler
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Synthesis of polyheterocyclesviamulticomponent reactions

Organic & Biomolecular Chemistry, 2018
Polyheterocycles are one of the most desired synthetic targets due to their numerous and valuable applications in various fields.
Ilich A. Ibarra, Alejandro Islas-Jácome, Eduardo González-Zamora   +2 more
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Conducting Polyheterocycle Composites Based on Porous Hosts *

Journal of Electronic Materials, 1992
Conducting composites based on porous substrates (cotton fiber, non-woven polypropylene mat and porous crosslinked polystyrene) have been prepared by a two step imbibition technique. First, the substrate was imbibed with a solution of monomer (pyrrole or bithiophene) in acetonitrile, followed by partial drying.
J. S. Park, E. Ruckenstein
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Thermoplastic polyheterocycles. II: Polyalkylene‐imides

Polymer Engineering & Science, 1994
AbstractPolyalkylene‐imides (i.e., aliphatic‐aromatic polyimides) were prepared smoothly in N‐methyl pyrollidone from straight chain aliphatic diamines and pyrromellitic dianhydride. Melting points of the polymers ranged from about 300 to 450°C, depending of the length of the alkylene chains.
J. Preston, Y. Tropsha
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CHAPTER 14. Alternating Polyheterocycles

2013
A series of π-conjugated alternating polymers containing heterocycles are reviewed in this chapter. Heteroles (heterocyclopentadienes) with boron, silicon, germanium, phosphorus, and transition metals are the main focus. In the former part, the characteristics and applications of these polymers are explained, focusing on the optical and electronic ...
Kazuo Tanaka, Yoshiki Chujo
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Stability studies of electrically conducting polyheterocycles

Synthetic Metals, 1991
Abstract The stability of the electrical conductivity of two types of polyheterocycles, the poly(3-alkylthiophenes) and polypyrrole, was examined under systematically controlled environmental and thermal conditions. The conductivity stability of the polypyrroles was found to be significantly better than that of the poly(3-alkylthiophenes ...
Yading Wang, M.F. Rubner, L.J. Buckley
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Synthesis of Polyheterocyclic Nitrogen-Containing Marine Natural Products

Monatshefte f�r Chemie / Chemical Monthly, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
David Fernandez, Abderaouf Ahaidar, Gerardo Danelon, Pablo Cironi, Marta Marfil, Olga Perez, Carmen Cuevas, Fernando Albericio, John A. Joule, Mercedes Alvarez   +9 more
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ChemInform Abstract: Synthesis of Novel Polyheterocycles.

ChemInform, 2001
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Amina Hassikou, Ghita Amine Benabdallah, Mohammed Naceur Dinia, Khalid Bougrin, Mohamed Soufiaoui   +4 more
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Poly(3-alkyltellurophene)s Are Solution-Processable Polyheterocycles

Journal of the American Chemical Society, 2013
The synthesis and characterization of a series of poly(3-alkyltellurophene)s are described. Polymers are prepared by both electrochemical and Kumada catalyst transfer polymerization methods. These polymers have reasonably high molecular weights (M(n) = 5.4-11.3 kDa) and can be processed in a manner analogous to that of their lighter atom analogues. All
Ashlee A, Jahnke, Brandon, Djukic, Theresa M, McCormick, Ester, Buchaca Domingo, Christoph, Hellmann, Yunjeong, Lee, Dwight S, Seferos   +6 more
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Chemistry of Organic Polyheterocyclic Conductors

Israel Journal of Chemistry, 1986
AbstractThe synthesis and some properties of polymeric heterocycles as well as the latest results in the area of soluble conducting polymers are reviewed. Polyheterocycles with long chain substituents exhibit unusual properties in solution while retaining a relatively high conductivity in the solid state.
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