Conjugated polymers electrical properties

These products were used in order to investigate the influence of the end groups upon some electronic properties of conjugated polymers (electrical, photo-electrical and luminescent properties) [26]. 

Subjects LCSH Conjugated polymers. Polymers—Electric properties. ... 

Table 2 shows the present state-of-the-art for the electrical conductivity of doped conjugated polymers. The magnitude of the electrical conductivity in polymers is a complex property determined by many stmctural aspects of the system. These include main-chain stmcture and TT-ovedap, molecular... 

There have been numerous studies of the electrical and emission properties of conjugated polymer-, small molecule-, and molecularly doped polymer-based OLEDs. The current-voltage and radiance-voltage characteristics have been nica sured as a function of thickness of the organic layer, temperature, different metal electrodes, etc. in an attempt to understand the device physics. A major factor in hibiting progress is the purity of the organic impurities that are incorporated dur-... 

Additional chemical stability can be given to PPVs by substitution at the vinyl-ene carbons. Thus, CN-PPV and PPV-DP are more stable than their parent polymers [173]. Carter et al. [172] showed that a random copolymer of PPV containing non-conjugated segments is considerably more stable to photooxidation than the fully conjugated polymer. Of course, the electrical and optical properties are also altered by these substitutions. 

Conjugated polymers, including optically active polymers and dendronized polymers that are very useful in electrical and optical fields and asymmetric catalysis, will continue to attract interest from chemists and materials scientists. It is well anticipated that more and more polymers with interesting structures and properties will be synthesized from the transition metal coupling strategy. 

Preliminary measurements of electrical conductivity of the conjugated derivatives of PBTAB, PBTB and PTTB obtained by the above treatment with bromine vapor are poor semiconductors with a conductivity of the order 10 °S/cm which apparently is not due to doping. Subsequent electrochemical or chemical doping of these polymers lead to 4-6 orders of magnitude increase in conductivity. Ongoing studies of the electrical properties of these conjugated polymers with alternating aromatic/quinonoid units will be reported elsewhere. 

R Kiebooms, R Menon, and K Lee, Synthesis, electrical, and optical properties of conjugated polymers, in Handbook of Advanced Electronic and Photonic Materials and Devices, FLS. Nalwa, Ed., Academic Press, New York, 2001, pp. 1-102. 

S. Beaupre and M. Leclerc, Optical and electrical properties of TT-conjugated polymers based on electron-rich 3,6-dimethoxyfluorene unit, Macromolecules, 36 8986-8991, 2003. 

Barford, W. 2005. Electronic Properties of Conjugated Polymers. Oxford University Press, Oxford. Blythe, T. and Bloor, D. 2005. Electrical Properties of Polymers. Cambridge University Press, Cambridge. Chiellini, E., Gil, H., Braunegg, G., Buchert, J., Gatenholm, P., and vander Aee, M. 2001. Biorelated Polymers. Kluwer, New York. 

Kahn A, Koch N, Gao WY (2003) Electronic structure and electrical properties of interfaces between metals and pi-conjugated molecular films. J Polym Sci B Polym Phys 41 2529... 

Multiple Heck reactions have also been applied in a number of ways to prepare polymers (Scheme 40). One-dimensionally 7r-conjugated polymers are attractive materials because of their optical and electrical properties resulting from 7r-electron delocalization along their main chains. Among these, poly(p-phenylenevinylene) (PPV) shows high electrical conductivity, large non-linear optical responses, and electroluminescent activity. One approach... 

Of much interest are the electroluminescence properties of conjugated polymers that allow the development of electrically switched light-emitting devices [8.257]. Electric field activated bistable molecules are expected to switch at a critical field strength [8.258]. 

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