ISSN:
1435-1536
Keywords:
Polyvinylacetate
;
air-water interface
;
surface moment
;
hysteresis
;
relaxation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Isotherms of surface pressure against surface area for a polyvinylacetate (PVAc) film at the air-water interface were determined at 20.52°C. Measurements of surface moment, hysteresis, and pressure relaxation in a constant area were subsequently conducted at appropriate area regions for elucidation of the correlation of properties and conformations of PVAc film. It is concluded that the film is stable and exhibits a perfectly reversible compression in the areas larger than 13 Å2/repeat-unit but assumes three different conformations for three regions (70-42), (42-25), and (25-13) Å2/repeat-unit, respectively. Finally, a twisting chain loop model is proposed for the interpretation of hysteresis and pressure relaxation occurring in the areas near and in the collapse region.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00656886
Permalink
