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Structure of Plasma‐Deposited Copolymer Films Prepared from Acrylic Acid and Styrene: Part II Variation of the Comonomer Ratio
Author(s) -
Fahmy Alaa,
Mix Renate,
Schönhals Andreas,
Friedrich Jörg
Publication year - 2013
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201200110
Subject(s) - comonomer , copolymer , x ray photoelectron spectroscopy , styrene , materials science , fourier transform infrared spectroscopy , polymer chemistry , acrylic acid , differential scanning calorimetry , analytical chemistry (journal) , plasma polymerization , polymerization , polymer , chemical engineering , chemistry , organic chemistry , composite material , physics , engineering , thermodynamics
Copolymers of acrylic acid and styrene (AA/S) were prepared by pulsed plasma deposition technique. Their structure–property relationships were studied in dependence on the comonomer ratio. Both, the regularity of the structure and the composition of the thin copolymer films were investigated by bulk‐sensitive (dielectric spectroscopy, FTIR, and differential scanning calorimetry) as well as surface‐sensitive methods such as X‐ray photoelectron spectroscopy (XPS). For an unambiguous identification of the functionality of the deposited films the COOH groups were estimated by derivatization with trifluoroethanol and subsequent XPS measurement as well as by the quantitative analysis of the FTIR data. As a result, the concentration of COOH groups on the surface and in the bulk is increasing with the fraction of AA in precursor mixture in a non‐monotonous way but similar to the dependence obtained by conventional free radical polymerization.