Accession Number : AD0676888

Title :   WETTABILITY AND MAIR INFRARED SPECTROSCOPY OF SOLVENT-CAST THIN FILMS OF POLYAMIDES AND POLYPEPTIDES.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Baier,R. E. ; Zisman,W. A.

Report Date : 16 SEP 1968

Pagination or Media Count : 28

Abstract : Polyamides, such as the nylons, polypeptides, and proteins, may have variable surface properties as the result of the masking or exposure of surface hydrogen-bonding sites which may greatly influence their behavior. An earlier investigation with the polyamide nylon 66, showing a wettability difference by hydrogen-bonding and nonhydrogen-bonding liquids, was confirmed and extended in the present work with nylon 11, nylon 6, and nylon 2 (polyglycine). This difference in wettability behavior seems diagnostic, when present in conjunction with a high critical-surface-tension range, for the presence of accessible amides in a polymer surface. Investigations of the more complex polypeptides, polymethylglutamate, and polybenzylglutamate by contact-angle determination and multiple attenuated internal reflection (MAIR) infrared spectroscopy on solvent-cast thin polymer films showed that the hydrogen-bonding capacity of the common polyamide backbone could be masked by either bulky side-chain substituents or by certain configuration changes of the polymer chain. Elimination of the hydrogen-bonding ability at nylon surfaces might also accompany polymer fractionation in different solvents, slight configuration changes, or a combination of both. (Author)

Descriptors :   (*POLYAMIDE PLASTICS, SURFACE PROPERTIES), (*PEPTIDES, SURFACE PROPERTIES), FILMS, WETTING, INFRARED SPECTROSCOPY, MOLECULAR ASSOCIATION, NYLON, GLYCINE, GLUTAMIC ACID, POLYMERS, MOLECULAR STRUCTURE, STEREOCHEMISTRY

Subject Categories : Plastics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE