Poly oxadiazole s

The class of PODA has been reviewed. Besides as polymers, 1,3,4-oxadiazole derivatives are used in medical and agricultural applications, e.g., in the field of chemotherapy or as herbicides and insecticides.  

Isophthaloyl chloride 4 4 -Diphenyl ether dicarboxylic acid 2,2 -(Oxydi-4,l-phenylene)bis[5-(4-fluorophenyl)-l,3,4-oxadiazole] 1 

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Enhanced photovoltaic cell efficiency was achieved via incorporation of highly electron-deficient oxadiazole moieties on side chains of poly(phenylene vinylenejs and poly(fluorene)s <2006SM949>. The synthesis of terminal... 

Table 12. Glass transition temperature of poly(arylene ether 1,3,4-oxadiazole)s...

Hole transport in polymers occurs by charge transfer between adjacent donor functionalities. The functionalities can be associated with a dopant molecule, pendant groups of a polymer, or the polymer main chain. Most literature references are of doped polymers. The more common donor molecules include various arylalkane, arylamine, enamine, hydrazone, oxadiazole, oxazole, and pyrazoline derivatives. Commonly used polymers are polycarbonates, polyesters, and poly(styrene)s. Transport processes in these materials are unipolar. The mobilities are very low, strongly field and temperature dependent, as well as dependent on the dopant molecule, dopant concentration, and the polymer host This chapter reviews hole transport in polymers and doped polymers of potential relevance to xerography. The organization is by chemical classification. The discussion mainly includes molecularly doped, pendant, and... 

High molecular weight aromatic poly(l,3,4-oxadiazole)s (PODS) were prepared by a one-pot procedure from dicarboxyhc acid and a hydrazine salt (sulfate, phosphate) or dicarboxylic acid dihydrazides in a mixture of ionic liquid and triphenyl phosphate, used both as a solvent and condensing agent. The polycyclization occurred at a sufficiently low temperature of 210 °C to give film-forming PODS [92]. 

Other examples of semiladder-like polymers include the poly(benzoxazole)s, poly(phenylene-13,4-oxadiazole)s, poly(quinoxaline)s, and poly(s-triazine)s. The high-temperature performance of these and other structures discussed are shown in Table 15.8. 

S.-P. Huang, J.-L. Liao, H.-E. Tseng, T.-H. Jen, J.-Y. Liou, and S.-A. Chen. Enhanced photovoltaic cells efficiency via incorporation of high electron-deficient oxadiazole moieties on side chains of poly(phenylene vinylenejs and poly(fluorene)s. Synth. Met., 156(14-15) 949-953, July 2006. 

B. Schulz, M. Bruma, andL. Brehmer. Aromatic poly(l,3,4-oxadiazole)s as advanced materials. Adv. Mater., 9 601-613,1997. 

F. A. Bottino, G. Di Pasquale, and A. Pollicino. Synthesis and characterization of new poly(arylene ether l,3,4-oxadiazole)s based on dihydroxyna-phthalene isomers. Polym. Bull, 45 345-350, 2000. 

The potential of poly(aromatic oxadiazole)s for electron injection has been studied by cyclic voltamme. When swept anodically, the polymer 14b-l was found to exhibit an irreversible oxidation peak at 1.67 V (with onset of 1.54 V) this value is... 

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