Premium
Surface chemistry of poly(β‐beiizyl L ‐aspartate)
Author(s) -
Malcolm B. R.
Publication year - 1970
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1970.360090805
Subject(s) - chemistry , monolayer , polymer , helix (gastropod) , crystallography , infrared spectroscopy , molecule , layer (electronics) , diffraction , stereochemistry , polymer chemistry , organic chemistry , optics , ecology , biochemistry , physics , snail , biology
Molecular monolaycrs of poly(β‐benzyl L ‐aspartate) spread at. an air‐water interface have been studied. The results obtained both by direct observations on the monlayer and from examination of collapsed films with polarized infrared spectroscopy and electron diffraction are consistent with the presence of right handed α‐helices in the mono‐layer when the molecular weight is high. When 1% (v/v) isopropanol is present in the subphase the right‐handed helix prevails, provided that the monolayer is first spread on water. Monolayers of low molecular weight polymer appear to form the crossed‐β structure. Orientated collapsed films of high molecular weight polymer can be converted to the left‐handed α‐helical and to the ω‐conformation, and the mechanisms are discussed. The surface chemistry of this polymer is compared with that of related polymers and a consistent pattern of behavior emerges.