Conformational disorder in conjugated polymers

Conformational disorder and ultrafast exciton relaxation in PPV-family conjugated polymers.

We report combined experimental and theoretical studies of excitation relaxation in poly[2-methoxy,5-(2'-ethyl-hexoxy)-1,4-phenylenevinylene] (MEH-PPV), oligophenylenevinylene (OPV) molecules of varying length, and model PPV chains. We build on the paradigm that the basic characteristics of conjugated polymers are decided by conformational subunits defined by conjugation breaks caused by torsio...

Conformational disorder of conjugated polymers: Implications for optical properties

Conformational disorder in long polyenes

We have studied the temperature dependence of the absorption spectra of soluble, conjugated polymers of known chain length ~;100–1000 double bonds!, synthesized by Schattenmann et al. @Macromolecules 29, 8990 ~1996!# using living polymerization techniques. The polymer spectra show significant redshifts upon cooling from 300 to 80 K. To estimate the distributions of conjugated segments in these ...

Revealing different aggregational states of a conjugated polymer in solution by a nanopore sensor

The functionalities of conjugated polymers are determined not only by local molecular structure, but also by the mesoscale conformational and morphological states of the polymer chains. Simulation studies have successfully established the connections betweenmolecular structure and conformational states of certain conjugated polymers. However, experimental tools that can accurately discriminate ...

بررسی آخرین یافته‌ها و دستگاه‌های آشکارسازی مقادیر کم مواد پرانرژی مبتنی بر پلیمرهای فلورسانس کننده

In recent years with the growing terrorist and subversive activities in the world, detection, prevent and already increasing the security factor of military and sensitive areas has become very important. Among the few existing technologies, to detect traces of explosives, use of conjugated polymers have better condition rather than other technology and can present canine sensitivity in frame of...