English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Synthesis of new side-chain liquid-crystalline polyoxetanes with two mesogenic groups connected by a flexible spacer in the side chain

del Campo, A., Bello, A., & Perez, E. (2002). Synthesis of new side-chain liquid-crystalline polyoxetanes with two mesogenic groups connected by a flexible spacer in the side chain. Macromolecular Chemistry and Physics, 203(7), 975-984.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
del Campo, A.1, Author              
Bello, A., Author
Perez, E., Author
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

Content

show
hide
Free keywords: asymmetric dimers; liquid-crystalline polymers (LCP); phase behavior; ring-opening polymerisation; spacer effects
 Abstract: Full Paper: The synthesis of a different geometry of side-chain liquid-crytalline polymers is reported where two mesogenic units connected by a flexible spacer are attached as pendent groups of a polymeric chain. The resulting structure is the following, where R-1, R-2 and R-3 are methylenic or oxymethylenic segments: [GRAPHICS] The monomers were obtained by linking the dimer structure to an oxetane ring. These substituted oxetanes were polymerised by a boron trifluoride- initiated cationic ring-opening reaction to obtain the corresponding polymers. The polymerisation proceeds with high yields, in spite of the steric hindrance derived from the bulkiness of the side chain, and the presence of some functional groups in the molecule that compete against the cyclic either for the nucleophilic attack at the propagating centre. A fraction of cyclic oligomer is obtained together with high molecular-weight polyoxetane, as a result of back-biting reactions during the polymerisation. Several systems with spacers of different length and parity were synthesized in order to analyse the influence of the nature of the spacer on the phase behaviour. The formation of mesophases was proved by means of differential scanning calorimetry, X-ray diffraction and microscopic analysis. Most of the monomers form smectic structures at subambient temperatures. The polymers display a similar phase behaviour, although shifted to higher temperatures.

Details

show
hide
Language(s): eng - English
 Dates: 2002-05-14
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28477
ISI: 000175987400008
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Macromolecular Chemistry and Physics
  Alternative Title : Macromol. Chem. Phys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 203 (7) Sequence Number: - Start / End Page: 975 - 984 Identifier: ISSN: 1022-1352