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Polypropylene fabrics were extracted with carbontetrachloride and acetone by Soxhlet extraction, and then PPAN ( plasma polymerized acrylonitrile ) was grafted to the surface of the extracted fabrics using a ground pressure of 0.05 mm Hg, 0.3 mm Hg pressure in the reactor, 60 W and 100 W RF power, and reaction times of 30 seconds, 1, 3, and 5 minutes. ESCA analysis was used to determine the ratios of carbon, nitrogen, and oxygen at a 20 Å sampling depth. IR and ATR-IR were used to obtain information on the structure of the grafted surface. Major differences were detected in the IR spectra of PPAN in comparison to PAN. The spectra of deposited polymers indicated the loss of —C≡N functional groups. Dehydrogenation and in tramolecular reorganization involving =C=N— and =C =C = also occurred, and as reaction time increased, the level of structural changes increased. Longer reaction periods and higher power resulted in increased deposition rates. Studying the water uptake and dyeability of PPAN revealed that higher treatment times lead to higher water uptake and K/S values. The nature of the substrate (Pyrex glass, KBr pellet, and polypropylene fabric) did not have a significant influence on the structure of deposited films.

SYNOPSISThere has been an increasing interest in depositing metal or metal-containing thin films through plasma polymerization for various applications. This work deals with the plasma graft polymerization of tetramethyltin (TMT) on polypropylene surfaces with an aim of producing special electrical and optical coatings. The fragmentation of TMT under cold plasma conditions and the recombination of discharge-generated active species were studied by analyzing the resulting molecular mixture trapped outside of the plasma zone by HR-MS and GC-MS techniques. It was found that the predominant ionic fragment is m/z = 165, and the most probable intermediate structure of the polymer formation mechanism is hexamethylditin. The structure of polymeric layers deposited on various substrates were investigated by ESCA and FT-IR methods. Intense oxidation of tin-based polymeric layers were observed under open laboratory conditions. The existence of weak Sn-Sn and Sn-C bonds in the polymeric structures is suggested to be responsible for this reaction. This phenomenon was associated with enhanced UV transparency. Based on analytical data a plasma-enhanced polymerization mechanism of TMT is proposed. 0 1995 John Wiley & Sons, Inc.

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