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Plasma polymerization of organoisothiocyanates. II. Structure of polymer film
Author(s) -
Czeremuszkin G.,
Wróbel A. M.,
Kryszewski M.
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070440517
Subject(s) - polymer , chemistry , polymerization , polysulfide , monomer , sulfide , analytical chemistry (journal) , pyrolysis , plasma , crystallography , polymer chemistry , physics , organic chemistry , electrode , quantum mechanics , electrolyte
Methyl‐, n ‐propyl‐, allyl‐, and phenyl isothiocyanates (MITC, PITC, AITC, and PHITC respectively) were polymerized in an RF (13.56 MHz) plasma electrodeless flow system. The plasma produced polymers were characterized using IR, GPC, GC/MS, and direct pyrolysis mass spectrometry (DPMS) techniques. The solubility tests and chromatographic examinations of the polymers revealed a small soluble fraction which contained a mixture of oligomers with a predominance of dimers and trimers. Molecular structure of the components of these fractions, identified by GC/MS, suggests fragmentation of the monomers to reactive fragments: \documentclass{article}\pagestyle{empty}\begin{document}$$ ^ \cdot {\rm RSCN},^ \cdot {\rm RCN},{\rm R}^ \cdot ,^ \cdot {\rm CN} $$\end{document} (in the case of MITC, PITC, AITC) and \documentclass{article}\pagestyle{empty}\begin{document}$ ^ \cdot {\rm ArNCS},{\rm PhS}^ \cdot ,{\rm Ph}^ \cdot ,^ \cdot {\rm CN} $\end{document} (in the case of PHITC). The DPMS data, being generally consistent with IR and GS/MS results, proved the presence in the polymers of sulfide, polysulfide, thiocarbonyl (–CS–S–and–S–CS–S–) groups, and molecular sulfur S 8 . Elementary plasma reactions involved in the formation of the observed structural units are proposed.