ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The synthesis and characterization of Cell-SAc 3, a cellulose isopentyl (IP) ether with additional pendant S-acetyl (SAc) moieties (degree of substitution DSIP = 2.5, DSSAc = 0.4) are reported. Cell-SAc forms stable monolayers at the air-water interface once spread from dilute chloroform solution. The pressure-area isotherm of Cell-SAc is nearly identical to the parent Cell-IP 1, both exhibiting an expanded liquid phase at surface areas of 70 and 67 Å, respectively. The similarity of the two isotherms shows that the presence of the S-acetyl substituent does not result in an increase in the molecular area, at which the liquid-crystal analogous phase occurs. This observation suggests that the side-chains with the pendant S-acetyl group are oriented away from the water surface. Monolayers of Cell-SAc can be efficiently transferred onto silicon and hydrophobized glass or quartz substrates by a downstroke and upstroke technique. Resulting multilayers were characterized using X-ray reflection, FTIR, and UV-vis spectroscopy. The presence of S-acetyl moieties was found to increase the monolayer thickness relative to the parent Cell-IP. The cleavage of the S-acetyl group within the LB film is reported.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
Permalink
