Accession Number : ADA259864


Title :   A Gel-Permeation Chromatography Study Of Electrochemically Synthesized Poly(3-Alkylthiophenes)


Descriptive Note : Technical rept. 31 May 1991-30 Jun 1992


Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA DEPT OF CHEMISTRY


Personal Author(s) : Wei, Y ; Tian, J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259864.pdf


Report Date : 26 Jun 1992


Pagination or Media Count : 14


Abstract : Poly(3-n-pentylthiophene) and poly(3-n-hexylthiophene) were prepared using potentiostatic method and were characterized by gel-permeation chromatography (g.p.c.) in THF. In general, the molecular weight of the polymers increased as the applied potential was increased in the range of 1.3 to 1.7 V vs. SCE. The presence of 2,2'-bithiophene in the polymerization system resulted in a slight decrease in molecular weight but the polymer chains having higher regularity as evidenced by longer pi-conjugation length. At the potentials greater than 1.9 V, the molecular weight decreased because of polymer degradation. The results strongly support the electrophilic aromatic substitution mechanism for electrochemical polymerization of thiophene monomers.


Descriptors :   *POLYMERS , *ELECTROCHEMISTRY , *ALKYL RADICALS , *GEL PERMEATION CHROMATOGRAPHY , *THIOPHENES , DEGRADATION , POLYMERIZATION , LENGTH , MONOMERS , POTENTIOSTATIC TECHNIQUES , SUBSTITUTION REACTIONS , CHROMATOGRAPHY , GELS , AROMATIC COMPOUNDS , CHAINS , ELECTRONS , MOLECULAR WEIGHT , SYNTHESIS


Subject Categories : Organic Chemistry
      Physical Chemistry
      Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE