ISSN:
1435-1536
Keywords:
π-A and μ-A isotherms
;
monolayers
;
air water interface
;
poly(hexamethylene adipamide)
;
spreading solution
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 Monolayer films on the neutral water substrate were obtained by spreadingN-trifluoroacetic anhydride (NTF)-modified nylon 66 or nylon 612 in chloroform solutions. Alternatively, monolayer films were obtained by spreading from nylon 66 solutions in the 3∶1 mixture of benzene (B) and phenol (P). The temperatures studied are 10.3°, 14.7°C, and 19.4°C. The isothermss of surface pressure (π), and surface moment (μ) against surface area per residue (A) were determined. The π-A isotherms of the NTF-modified nylon 66/chloroform and the nylon 66/BP were found to be an expanded type, while that of NTF-modified nylon 612/chloroform was of a condensed type. The NTF-modified nylon 66/chloroform solutions could yield well-spread films even higher concentrations than nylon 66/BP solutions. In the μ-A isotherms at 10.3° and 14.7°C, the surface moments are constant at 143 mD/residue for NTF-modified nylon 66/chloroform, and 340 mD/residue for nylon 66/BP until the surface area reaches where the π-A isotherms show a transition point. After the transition point, the surface moments for both systems drop steadily. However, the surface moment at 19.4°C shows a maximum at the transition point. Possible configuration of the nylon 66 residue in monolayer is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00655669
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