Poly l-phenyl-2-p-

Since only Ta and Nb catalysts, which are not tolerant to polar groups, are available for the polymerization of sterically crowded disubstituted acetylenes, it is generally difficult to directly synthesize disubstituted acetylene polymers that have a highly polar substituent such as a hydroxy group. Recently, the synthesis of poly[l-phenyl-2-(p-hydroxyphenyl)acetylene] has been achieved by the polymerization of l-phenyl-2-(p-r-butyldimethylsiloxyphenyl)acetylene (11) and the subsequent add-catalyzed deprotection reaction. ... 

Example 17 Syntheses of Poly l-phenyl-2-(p-r-butyldimethylsiloxyphenyl)-acetylene) and Poly l-phenyl-2-(p-hydroxyphenyl)acetylene ... 

Poly(DPA) is, thermally, the most stable substituted polyacetylene, but it is insoluble in any solvent, and hence it is impossible to fabricate a membrane from it by solution casting. In order to prepare this polymer membrane, desilylation of poly[l-phenyl-2-p-(trimethylsilyl)phenylacetylene] (PTMSDPA) membrane has been examined by use of trifluoroacetic acid as catalyst in hexane. The desilylation reaction proceeds to completion, as evidenced by IR spectroscopy and the anticipated weight decrease (eqn [a] in Scheme 4). As expected, the poly (DPA) membrane produced is insoluble in any solvent and possesses high thermal stability. This polymer shows fairly high gas permeability irrespective of the absence of any spherical substituent, as described below. The pinanylsilyl-containing poly(DPA) in eqn [b] is soluble, membrane-forming, and CD-... 

Meeker, D.L., D.S.K. Mudigonda, J.M. Osborn, D.C. Loveday, and J.P. Ferraris. 1998. Tailoring electrochromic properties using poly(N-vinylcarbazole) and poly(N-phenyl-2-(2 -thienyl)-5-(5"-vinyl-2"-thienyl)pyrrole) blends. Macromolecules 31 2943-2946. 

Polyquinolines form another class of heteroaromatic polymers exhibiting photoconductivity. The interest in the synthesis of polyquinolines has increased rapidly during the last decade because of their excellent oxidative and thermal stability. When doped with alkali metal donor compounds like sodium naphthalide or sodium anthracide, several polyquinolines show electrical conductivity as high as 10 S/cm [336,337], When doped with electron-donor compounds such as TNF or 2,3-dichloro-5,5-dicyano-l,4-benzoquinone some poly-quinolines show distinct photoconductivity. One such polyquinoline is poly(4-phenyl-2,6-(p-phenoxy)-quino-line) (54b) [338,339]. It is obtained by the acid catalysed self-condensation reaction of 4-amino-4 -acetyl-3-benzoyl diphenyl ether (54a). 

Polymers with anthracene groups such as poly(9-vinylanthracene)46 48), poly(l-vinylanthracene) and poly(2-vinylanthracene)49 so), poly[ l-(2 -anthryl)-ethylmethacrylate]51 poly(vinyl-p-phenyl-9-anthracene)S2 55 and poly(9-p-expoxy-... 

Bis[2-(pyrid-2 -yl)phenyl] tritellurium1.- yield 90% m.p. 166° (from benzene/toluene) Poly [6-phenyl-l-(2-tritelluro-phenyl)-2,5-diaza-l,5-hexadien]-2 (phenyl), Te" -diyl 2 yield 65% m.p.128c (from benzene)... 

Naito and Kanemitsu (1996) investigated the relationship between the prefactor mobilities, zero-field mobilities, and the glass transition temperatures of OX doped polyarylate (PA), PC, poly(methyl methacrylate) (PMMA), PS, poly(vinyl chloride) (PVC), polyethylene terephthalate) (PET), and poly(vinyl butyral) (PVB), DEH doped PC, 5(p-diethylaminophenyl)-l-phenyl-3-(/ -diethylaminostyryl)-2-pyrazoline (DEASP) doped PS, and DEASP doped PC. OX, DEH, and DEASP are highly polar molecules with similar dipole moments. By modifying the polymer, the glass transition temperature can be varied over... 

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