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Trifluoroethanol Derivatization of Carboxylic Acid‐containing Polymers for Quantitative XPS Analysis
Author(s) -
Alexander M. R.,
Wright P. V.,
Ratner B. D.
Publication year - 1996
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/(sici)1096-9918(199603)24:3<217::aid-sia103>3.0.co;2-l
Subject(s) - steric effects , chemistry , derivatization , methacrylic acid , acrylic acid , x ray photoelectron spectroscopy , carboxylic acid , polymer chemistry , poly(methacrylic acid) , polymer , yield (engineering) , organic chemistry , high performance liquid chromatography , materials science , polymerization , chemical engineering , copolymer , engineering , metallurgy
The carboxylic acid groups of poly(acrylic acid) (PAA) and poly(methacrylic acid) (PMAA) were derivatized in the solid state using a procedure resulting in esterification by trifluoroethanol vapour. X‐ray photoelectron spectroscopy analyses incidate that stoichiometric reaction with PAA was reached after 10 h. However, PMAA did not attain a yield greater than 60%, an effect rationalized in terms of steric hindrance. It is postulated that steric restraints are imppsed by conformational inflexibility related to the pendant methyl group within isotactic portions of the chain.