ISSN:
1022-1352
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
Stable monolayers of a novel side-chain liquid crystalline polysiloxane (PI) and its monomer (MI), both having low transition temperatures, are formed at the air/water interface at 20°C. In monolayer films mesogens are packed closely and their long axes are titled slightly to the water surface. Monomer molecules are thought to lie flat on the water surface when they are initially spread, and a possible model is presented to describe the conformational changes after compressing. Multilayer formations have been observed during isothermal compression of both the polymer and the monomer. Monomer monolayers cannot be deposited onto hydrophobic substrates, whereas polymer monolayers can be deposited at various surface pressures with Y-type or Z-type. UV-Vis spectra of PI Langmuir-Blodgett films indicate that H-aggregates are formed during film formation. The absorption of Langmuir-Blodgett films and cast films shows a distinct hypsochromic shift compared with that of PI chloroform solution.
Zusätzliches Material:
7 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/macp.1995.021961014
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