𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Monodomain Liquid Crystal Main Chain Elastomers by Photocrosslinking

✍ Scribed by Patrick Beyer; Eugene M. Terentjev; Rudolf Zentel

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
214 KB
Volume
28
Category
Article
ISSN
1022-1336

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

A new synthetic strategy for the preparation of macroscopically oriented smectic main chain liquid crystal elastomers (MC‐LCE) by the photocrosslinking of laterally functionalized polyesters is presented. X‐ray measurements proved the formation of the monodomain and allowed a quantitative determination of the order parameter. The thermo‐actuation of our material at the phase transition from the liquid‐crystalline to the isotropic phase was demonstrated by temperature dependent measurements of the sample length, showing a fully reversible shape change of ≈40%. Mechanical measurements showed that the sample can be stretched by up to 60% along the smectic layer normal without any reorientation of the structure, in contrast to earlier experiments and theoretical predictions. The results are discussed in the context of limited smectic layer correlation in different types of smectic materials.

magnified image

📜 SIMILAR VOLUMES

Polydomain–Monodomain Orientational Proc
Polydomain–Monodomain Orientational Process in Smectic-C Main-Chain Liquid-Crystalline Elastomers
✍ Antoni Sánchez-Ferrer; Heino Finkelmann 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 582 KB

## Abstract The polydomain–monodomain (PM) transformation takes place when a polydomain of a smectic‐C main‐chain liquid‐crystalline elastomer (SmC MCLCE) is uniaxially stretched. We present results based on a combination of mechanical and X‐ray experiments which show how the domains initially rear

Liquid-crystalline main-chain elastomers
Liquid-crystalline main-chain elastomers
✍ Gerd H. F. Bergmann; Heino Finkelmann; Virgil Percec; Mingyang Zhao 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 518 KB

## Abstract A main‐chain elastomer was synthesized for the first time by a cross‐linking hydrosilylation of a cyclosiloxane with a new main‐chain liquid crystalline semiflexible polyether. Imposing a uniaxial mechanical field to the unstretched nematic polydomain sample results in a macroscopic ali

Photocrosslinkable Liquid Crystal Main-C
Photocrosslinkable Liquid Crystal Main-Chain Polymers: Thin Films and Electrospinning
✍ Simon Krause; Roland Dersch; Joachim H. Wendorff; Heino Finkelmann 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 246 KB

## Abstract For mechanical actuators, a response to external stimuli is required. Main‐chain liquid crystal elastomers (MCLCEs) show high response to changes in temperature especially in the vicinity of a phase transition. Most of these crosslinked materials were synthesized in a one‐step reaction

Shear Mechanical Properties of Main Chai
Shear Mechanical Properties of Main Chain Liquid Crystalline Elastomers
✍ Daniel Rogez; Holger Brandt; Heino Finkelmann; Philippe Martinoty 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 261 KB

## Abstract Summary: The behavior of the complex shear modulus __G__ = __G′__ + i__G″__ of a main chain liquid crystalline elastomer film oriented with the director in the plane of the film is investigated for the first time by shearing the film in a direction perpendicular or parallel to the direc

Influence of Swelling on the Shear Mecha
Influence of Swelling on the Shear Mechanical Properties of Monodomain Side-Chain Liquid-Crystal Elastomers: Gaussian Versus Non-Gaussian Elasticity
✍ Daniel Rogez; Felicitas Brömmel; Heino Finkelmann; Philippe Martinoty 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 493 KB

## Abstract The shear mechanical properties of nematic side‐chain liquid‐crystal elastomers swollen with a nematic solvent are studied. The results show that the elasticity of the network is Gaussian for elastomers oriented before crosslinking and non‐Gaussian for the usual twice‐crosslinked elasto