Molecular structure of interfaces between plasma-polymerized acetylene films and steel substrates

Plasma‐polymerized films of acetylene were deposited onto steel substrates in an inductively coupled reactor by exciting the plasma in an argon carrier gas and then injecting the monomer into the afterglow region. The molecular structure of the film/substrate interface was determined using reflectio...

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Published inJournal of applied polymer science Vol. 70; no. 7; pp. 1283 - 1298
Main Authors Tsai, Y. M., Boerio, F. J.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York John Wiley & Sons, Inc 14.11.1998
Wiley
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Summary:Plasma‐polymerized films of acetylene were deposited onto steel substrates in an inductively coupled reactor by exciting the plasma in an argon carrier gas and then injecting the monomer into the afterglow region. The molecular structure of the film/substrate interface was determined using reflection–absorption infrared spectroscopy (RAIR) and X‐ray photoelectron spectroscopy (XPS) to characterize the films as a function of thickness. RAIR showed that thick (∼ 900 Å) as‐deposited plasma‐polymerized acetylene films had a complicated molecular structure and contained methyl and methylene, mono‐ and disubstituted acetylene, vinyl, and cis‐ and trans‐disubstituted olefin groups. Evidence of oxidation resulting from the reaction of trapped radicals with atmospheric oxygen and moisture to form O—H and C=O groups was also obtained. The molecular structure of thin films (∼ 60 Å) was similar although evidence was obtained to indicate that acetylide groups (H—C≡C−) were present at the film/substrate interface. Results obtained using angle‐resolved XPS analysis showed that carbonaceous contamination was removed from the substrate and that oxides and hydroxides on the substrate surface, especially FeOOH, were chemically reduced during deposition of the films. XPS also confirmed that plasma‐polymerized acetylene films deposited on steel substrates contained ${\backslash\atop/}\hbox{C--O-- and}{\backslash\atop/}\hbox{C}=\!\!=\hbox{O}$ groups. Preliminary results also showed that films deposited in an inductively coupled reactor were good primers for rubber‐to‐metal bonding, whereas films deposited in a capacitively coupled reactor were not. The differences may be due to the wide variety of functional groups found in the former type of films but not in the latter. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 1283–1298, 1998
Bibliography:ark:/67375/WNG-HG1MWVBM-M
istex:1F8A37BBF0723FE0509486AEFE5CA40CFD4390C0
National Science Foundation
ArticleID:APP5
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0021-8995
1097-4628
DOI:10.1002/(SICI)1097-4628(19981114)70:7<1283::AID-APP5>3.0.CO;2-I