Accession Number : ADA251431

Title :   New Polymerization methodology: Synthesis of Thiophene-Based Heterocyclic Polyethers.

Descriptive Note : Technical rept.,

Corporate Author : NORTH CAROLINA UNIV AT CHAPEL HILL DEPT OF CHEMISTRY

Personal Author(s) : DeSimone, J. M. ; Sheares, V. V.

Report Date : 20 MAY 1992

Pagination or Media Count : 17

Abstract : A new methodology is described for the synthesis of aromatic heterocyclic polyethers which employs thienyl-phenyl ether bond formation as the polymer forming reaction. The efficacy of the new polymerization methodology was first investigated with model compounds where the potassium salt of t-butylphenoxide was found to quantitatively displace the activated chloride on 2benzoyl-5-chlorothiophene to yield 2-benzoyl-5-(4-t-butylphenoxy)thiophene. The model reaction was extended to the synthesis of high polymer using bis(5-chlorothienyl-2)ketone and 4,4'isopropylidenediphenol in an azeotroping mixed solvent system with K2CO3. The resulting polymer was characterized to confirm its composition, structure, and molar mass. This new methodology uses facile synthetic routes and economically feasible starting materials and opens the way to a large variety of heterocyclic, aromatic polyethers which are generally applicable for utilization as advanced materials for structural composites. Thiophene, Heterocyclic polyethers, PEEK, Thermoplastic composites.

Descriptors :   *POLYETHERS, *POLYMERIZATION, *THIOPHENES, CHLORIDES, ETHERS, MASS, MATERIALS, METHODOLOGY, MODELS, PHENYL ETHER, POLYMERS, POTASSIUM, SALTS, SOLVENTS, STARTING, STRUCTURES, SYNTHESIS, UTILIZATION, AZEOTROPES.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Plastics
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE