Arylene-vinylene copolymer

Polymer Light-Emitting Diodes Utilmng Arylene-Vinylene Copolymers as Light-Emitting... 

In this paper we will discuss the relation between light-emitting properties and the chemical structure of arylene vinylene copolymers. 

OHNISHI ETAL. P-LED Devices Using Arylene-Vinylene Copolymers 347... 

Aromatic oxadiazoles. See Oxadiazole-based polymers Arylene-vinylene copolymers alternating and random copolymerization, 346-348... 

Ohnishi, T., et aL 1997. Polymer light emitting diodes using arylene vinylene copolymers. ACS Symp Ser 672 345. 

R. M. Gregorius, P. M, Lahti, and F. E. Karasz, Preparation and characterisation of poly(arylene-vinylene) copolymers and their blends. Macromolecules 25 6664 (1992). 

R. W. Lenz, C.-C. Han, and M. Lux, Highly conducting, iodine doped arylene vinylene copolymers with dialkoxyphenylene units. Polymer i0 1041 (1989). 

Heteroaromatic ring stmctures can also be incorporated into poly(arylene vinylene) stmctures using the same precursor polymer method shown for PPV. Poly(thienylene vinylene) (13) (113—118) and poly(furylene vinylene) (14) (119,120) have been prepared in this manner. In addition, alkoxy-substituted poly(thienylene vinylenes) (15) (119,121) have been synthesized. Various copolymers containing phenjiene, thienylene, and furylene moieties have also been studied (120,122,123). 

Triarylamines have been employed in arylene vinylene AB copolymers 38 by Horhold et al. using a Homer polycondensation route of aldehydes and ketones 36 with fois-phosphonate 37 (Scheme 1-12) 164]. Phenylamines have remarkably low redox potentials and their charge transport properties have been investigated extensively [65]. EL devices comprising triarylamines have demonstrated low driving voltages. 

Poly(arylene vinylene) derivatives were prepared by Wittig reaction of diphosphonium compounds(I and V), and dialdehyde compounds , Ill,and IV) as shown in Figurel. When I and II, I and IE, I and IV, and V and II are used, soluble alternating copolymers of (A), (B), (C), and (D) are obtained respectively(16,17,18). The diphosphonium compounds were prepared using triphenylphosphine and... 

Figure 1. Synthetic route for alternating and random copolymers of arylene vinylenes...

Copolymers with arylene-ethynylene and arylene-vinylene units combine the intrinsic features of both moieties in a single polymeric backbone [147]. 

The only example of rod-rod copolymers with polyphenylene-based rods are the polymers 230 and 231, in which two polyfluorene blocks are separated by a short arylene vinylene unit (Scheme 105). These were prepared by Suzuki polycondensation of a fluorene monoboronic acid 232 in the presence of the bromo-substituted oUgo(arylene vinylene) units 233 and 234 [321], From the molecular masses of the polymers, the total number of fluorene units in both 230 and 231 is about 18. 

Scheme 105 Fluorene-(arylene vinylene) block copolymers... 

Garay, R. O., Karasz, F. E., and Lenz, R. W., Synthesis and properties of phenyl-substituted arylene vinylene polymers and copolymers, J.M.S. Pure Appl. Chem., A32, 905-923 (1995). 

D. Copolymers Incorporating Polyene or Arylene Vinylene Repeat Units... 

PAVs, where electrically conductive films with good transparency are easily obtained from their precursor polymers, are one group of -conjugated polymers and regarded as an alternating copolymer of acetylene and arylene. They have variations in chemical structure such as poly(p-phenylene vinylene), (PPV), poly(2,5-thienylene vinylene), (PTV), and poly(2,5-dimethoxy-p-phenylene vinylene), (MOPPVY9-1D. They have... 

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