𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Thermal cis-trans isomerization and temperature-dependent phase behaviour of polyisoprene-polyacetylene solutions

✍ Scribed by Liming Dai

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
763 KB
Volume
198
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Polyacetylene can be solubilized by making copolymers with polyisoprene via anionic polymerization of isoprene using BuLi as the initiator, followed by Ziegler‐Natta copolymerization of acetylene onto the polyisoprenyllithium chains using either Ti(OBu)~4~ or CoCl~2~. In the present study, the effects of temperature on cis‐trans isomerization of the polyacetylene blocks and the phase behaviour of the PI‐PA copolymers in solution were investigated. We found that isomerization of the cis‐polyacetylene blocks in a solution of the PI‐PA copolymer is retarded by some intramolecular barriers, making the cis‐isomer rather stable. Reducing the temperature below about 12°C was found to cause a phase transformation from the worm‐like structure to spherical micelles in solution.

📜 SIMILAR VOLUMES

Photoselective synthesis of azobenzene-c
Photoselective synthesis of azobenzene-containing cyclic oligosarcosine and its thermal cis → trans isomerization in solution
✍ Masahiko Sisido; Hiroshi Ito; Yukio Imanishi 📂 Article 📅 1982 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 682 KB

## Abstract Oligosarcosines, which contain as azobenzene group at the center of the chain and amino groups at both ends [(Sar)~__n__~Azo(Sar)~__n__~], were prepared with the __N__‐carboxyanhydride method. The oligomers were coupled with an equimolar amount of succinyl chloride in the presence of

The kinetics of the gas-phase thermal is
The kinetics of the gas-phase thermal isomerization and decomposition of Trans- and Cis-1,2-Bis(trifluoromethyl)-1,2,3,3-tetrafluorocyclopropane
✍ Juan C. Ferrero; Eduardo H. Staricco 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 437 KB 👁 1 views

## Abstract The kinetics of the gas‐phase thermal isomerization between __trans__‐ and __cis__‐1,2‐bis(trifluoromethyl)‐1,2,3,3‐tetrafluorocyclopropane as well as their decomposition to __trans__‐ and __cis__‐perfluoro‐2‐butene, respectively, and CF~2~, was studied in the temperature range of 473–5

Rate constants of the thermal cis-trans
Rate constants of the thermal cis-trans isomerization of azobenzene dyes in solvents, acetone/water mixtures, and in microheterogeneous surfactant solutions
✍ Kathrin Gille; Helmut Knoll; Konrad Quitzsch 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 217 KB 👁 2 views

Rate constants k iso of the thermal cis-trans isomerization of four 4,4'-nitro-aminoazobenzenes with different amino groups have been determined in homogeneous aprotic solvents and polyglykol oligomers, primarily by means of conventional flash photolysis. The rate constants have been correlated with

Kinetics of the thermal dimerization and
Kinetics of the thermal dimerization and isomerization of cis, trans-1,5-cyclooctadiene in the gas phase and of related reactions. A simple algorithm to determine the rate constants of competing first- and second-order reactions
✍ J. Leitich 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 687 KB

## Abstract In the gas phase, __cis__,__trans__‐1,5‐cyclooctadiene (\documentclass{article}\pagestyle{empty}\begin{document}$ {\mathop 1\limits\_\sim} $\end{document}) undergoes a unimolecular rearrangement to __cis__,__cis__‐1,5‐cyclooctadiene (\documentclass{article}\pagestyle{empty}\begin{docume