Donald A. Seanor
Xerox
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Featured researches published by Donald A. Seanor.
Polymer | 1978
Donald A. Seanor; Joseph A. Swift
Abstract The oxidative coupling of mercaptan-containing poly(dimethyl siloxane) polymers: catalysed by different metals has been studied. In the presence of excess oxygen, the kinetics obey the law, d(SH) d t = −k( SH ) n , where n = 0 or 2 dependent upon temperature and the specific metal. The rate constant, k, is independent of x and y in the range studied but is a function of the metal. An activation energy of 18.4 ± 0.6 kcal/mol was found. It is postulated that the following sequence of reactions occurs: Depending upon the metal and temperature, desorption (step 3) or reaction (step 2) may be the ratelimiting step. Steps (3) and (4) may occur simultaneously. Metals for which no oxidation/reduction couple exists show little catalytic effect even though a strongly bonded interfacial layer is formed. The interfacial layer which formed rapidly was studied via reflection spectroscopy and protective ability. It is strongly bonded, of low critical surface energy and consists primarily of: However, it is enriched in sulphur over the bulk polymer.
Archive | 1979
Donald A. Seanor
Archive | 1974
Donald A. Seanor; James A. Lentz; Clifford O. Eddy; Stephen Strella
Archive | 1978
Stephen Strella; Donald A. Seanor; George R. Imperial; Thomas R. Hoffend
Archive | 1974
George R. Imperial; Donald A. Seanor
Archive | 1974
Stephen Strella; Donald A. Seanor; George R. Imperial; Thomas R. Hoffend
Archive | 1991
George J. Bingham; Patrick J. Finn; George J. Heeks; Arnold W. Henry; Donald A. Seanor
Archive | 1994
Arnold W. Henry; Donald A. Seanor; George J. Heeks; Clifford O. Eddy; Che C. Chow; Santokh S. Badesha; Samuel Kaplan; David H. Pan
Archive | 1980
Paul D. Depalma; James A. Lentz; Rabin Moser; Donald A. Seanor
Archive | 1978
Donald A. Seanor; Judy P. Nagel