AVS 47th International Symposium
    Material Characterization Wednesday Sessions
       Session MC-WeM

Paper MC-WeM8
Exploration of the Time-of-Flight Secondary Ion Mass Spectra of Combinatorially Designed Polyarylates by using a Novel Multivariate Statistical Approach

Wednesday, October 4, 2000, 10:40 am, Room 207

Session: Methods of Data Analysis
Presenter: B.J. Tyler, Montana State University
Authors: B.J. Tyler, Montana State University
A. Belu, Physical Electronics
Correspondent: Click to Email
In this study, a novel multivariate data analysis method has been used to explore relationships in the TOF-SIMS spectra from a series of polyarylates, with well-controlled and systematically varying chemistry. A series of 16 polyarylates was prepared from 4 distinct tyrosine-derived dipheols and 4 aliphatic diacids. This series is a subset of a library of 112 polyarylates described by Brocchini et al. These materials which have well controlled and systematically varying chemistry are ideal for evaluation by surface analysis techniques. The effects of incremental increase in polymer backbone length and polymer side-chain length can be evaluated. SIMS spectra of these polymers have been investigated by Belu, et al. These polymers show a series of peaks which are shifted by a mass characteristic of the particular polyarylate chemistry. Although principal components analysis and other multivariate methods have proved to be a very powerful aid for interpreting SIMS spectra, patterns which are shifted by a mass unit are invisible to these methods. A novel approach to multivariate analysis has been developed which is sensitive to characteristic shifts in the mass spectra rather than solely to peak positions. Details of the multivariate method as well as results for the polyarylate polymer series will be presented. @FootnoteText@ @Footnote 1@Brocchini S, James K, Tangpasuthado V, Kohn J, JACS, 1997; 119(19): 4553-4554 @Footnote 2@Belu A, Brocchini S, Kohn J, Ratner B, Rapid Communications in Mass Spectrometry, in press.