𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Direct Measurement of the End-to-End Distance of Individual Polyfluorene Polymer Chains

✍ Scribed by Benoît Muls; Hiroshi Uji-i; Sergey Melnikov; Alain Moussa; Wendy Verheijen; Jean-Philippe Soumillion; Jacob Josemon; Klaus Müllen; Johan Hofkens

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
503 KB
Volume
6
Category
Article
ISSN
1439-4235

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Wide‐field imaging of individual multichromophoric molecules and successive photobleaching were used to determine, accurately, the relative position of the chromophores in such systems. First, a polyphenylene dendrimer with well‐defined geometry was used to establish the accuracy in localization that can be obtained by this methodology. For a signal‐to‐noise ratio of 20, interchromophoric distances could be measured with 4 nm accuracy. Next, the method was used to determine the end‐to‐end distribution of an end‐capped polyfluorene polymer. From comparison between the experimental and simulated distributions, information on the conformation of the polymer could be deduced. It was found that the polymer has a nonlinear conformation. A conjugation length of six monomer units gave the best fit of the experimental data to the proposed model.

📜 SIMILAR VOLUMES

The effect of chain length on the mean v
The effect of chain length on the mean value of the end-to-end distance of a random-flight polymer chain adsorbed on a surface
✍ Anil Kumar; Santosh K. Gupta; Ratan Mohan 📂 Article 📅 1977 🏛 Elsevier Science 🌐 English ⚖ 415 KB

A general solution of the onedimensional random-walk probIem with an adsorbing barrier has been devefoped. For a given adsorption energy, 8, as the chain length is incx\*sed, the mean position of the free end of the molecule with respect to the surface, z, approaches the asymptotic values predicted

Mean-Square End-to-End Distance and Char
Mean-Square End-to-End Distance and Characteristic Ratio of Polyvinylene (Polyacetylene) Chains of Various Configurations
✍ Jiří Vohlídal 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 136 KB

## Abstract Summary: Closed‐form analytical expressions are derived for the mean‐square end‐to‐end distance of unperturbed polyvinylene chains of various configurational structure with freely rotating main‐chain single bonds. In particular, expressions are derived for (__i__) stereoregular chains:

Dielectric relaxation of polymer network
Dielectric relaxation of polymer networks built from macromolecules with dipole moment directed along the end-to-end chain vector
✍ Yuli Ya. Gotlib; Andrei A. Gurtovenko 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 835 KB

## Abstract The dielectric relaxation properties are considered for polymer networks built from polar macromolecules with the dipole moment directed along the end‐to‐end chain vector. The viscoeleastic cubic model of a regular network is used. The fixed average volume of a polymer network is ensure