LANGMUIR-BLODGETT-FILMS OF SIDE-CHAIN POLYSILOXANES - SYNTHESIS, CHARACTERIZATION AND PYROELECTRIC BEHAVIOR

Richardson, T. and Holder, Simon J. and Lacey, D. (1992) LANGMUIR-BLODGETT-FILMS OF SIDE-CHAIN POLYSILOXANES - SYNTHESIS, CHARACTERIZATION AND PYROELECTRIC BEHAVIOR. Journal of Materials Chemistry, 2 (11). pp. 1155-1160. ISSN 0959-9428. (Full text available)

PDF
Download (718kB)
[img]
Preview

Abstract

Four aliphatic acid side-chain polymers have been synthesized and evaluated, based upon two different polysiloxane backbones, namely poly(methylsiloxane) and poly(methylsiloxane-dimethylsiloxane). A study of their behaviour at the water/air interface has shown that stable, fluid molecular films are formed that can be transferred as monolayers onto hydrophilic substrates. Their surface pressure-area isotherms indicate that bunching of the polysiloxane backbones may occur at relatively high surface pressures. The alternate layer deposition process has been used, in which the polysiloxane is co-deposited with a monomeric aliphatic amine (icosylamine). This ABABA... sequential transfer has been monitored using the piezoelectric quartz crystal microgravimetric technique in which the alternate layer is assembled on top of a bulk quartz crystal, the oscillation frequency of which is measured precisely. The relationship between the frequency change and the number of transferred polysiloxane/monomer icosylamine bilayers is linear for the three materials that could be deposited, indicating that the deposition process is highly reproducible. The pyroelectric effect in these films has been studied. These data indicate that the level of activity is not simply related to the fraction of the silicon units along the backbones which are substituted with aliphatic acid chains. There is likely to be a trade-off between the density of acid/amine interactions and the free volume in which molecular tilting can occur.

Item Type: Article
Additional information: 9 ROYAL SOC CHEMISTRY JY804
Uncontrolled keywords: LANGMUIR-BLODGETT FILM; POLYSILOXANE; PYROELECTRICITY
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Simon Holder
Date Deposited: 01 Oct 2010 14:53
Last Modified: 22 May 2014 11:07
Resource URI: http://kar.kent.ac.uk/id/eprint/11734 (The current URI for this page, for reference purposes)
  • Depositors only (login required):

Downloads

Downloads per month over past year