Role of main chain rigidity and side-chain substitution on the supramolecular organization of rigid-flexible polymers
Loading...
Date
Authors
Riala, P.
Andreopoulou, A.
Kallitsis, J.
Gitsas, A.
Floudas, G.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Type
Type of the conference item
Journal type
peer reviewed
Educational material type
Conference Name
Journal name
Polymer
Book name
Book series
Book edition
Alternative title / Subtitle
Description
The synthesis, characterization and supramolecular organization of rigid-flexible aromatic-aliphatic polyethers are reported. The polymers contain substituted quinquephenyl moieties along their main chains separated by flexible aliphatic units of various lengths. The oligophenylene segments bear different types of dodecyloxy tailed side groups, either attached on the periphery of side dendritic wedges (G(1)) or as direct side-chains (GO). Their structural characterization was per-formed by means of differential scanning calorimetry, polarizing optical microscopy and X-ray scattering from oriented fibers. These techniques revealed the presence of supramolecular organization in different levels and in the absence of solvent, reflecting a delicate balance of interactions produced by the rigid-flexible backbone segments and the size of dendritic side-chains. It was concluded that the polymers with only two dodecyloxy side-chains (zeroth generation, G(0)) possess smectic order. On the other hand, substitution of the quinquephenyl backbone with the dodecyloxy decorated dendrons (first generation, G(1)) disrupts the lateral order giving rise to a nematic state. These results are compared with the corresponding rigid-flexible polyethers; having terphenyl rigid segments. (c) 2006 Elsevier Ltd. All rights reserved.
Description
Keywords
rigid-flexible polymers, supramolecular organization, x-ray, aromatic-aliphatic polyethers, dendronized polymers, rod polymers, soluble poly(para-phenylene)s, structural-analysis, micro-segregation, phase-behavior, shape, dendrimers, mesophase
Subject classification
Citation
Link
<Go to ISI>://000241421300041
http://ac.els-cdn.com/S0032386106007993/1-s2.0-S0032386106007993-main.pdf?_tid=92471cc05343bc7c5a2fa3e817239d23&acdnat=1334220576_646b2dfd60bcef0ff09c852ed6ae4ede
http://ac.els-cdn.com/S0032386106007993/1-s2.0-S0032386106007993-main.pdf?_tid=92471cc05343bc7c5a2fa3e817239d23&acdnat=1334220576_646b2dfd60bcef0ff09c852ed6ae4ede
Language
en
Publishing department/division
Advisor name
Examining committee
General Description / Additional Comments
Institution and School/Department of submitter
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών