AVS 47th International Symposium
    Material Characterization Thursday Sessions
       Session MC-ThM

Paper MC-ThM4
Surface Composition of Poly(imidesiloxane) Copolymers Containing Multiple Siloxane Lengths

Thursday, October 5, 2000, 9:20 am, Room 207

Session: Polymer Characterization
Presenter: C.M. Mahoney, State University of New York at Buffalo
Authors: C.M. Mahoney, State University of New York at Buffalo
J Rosenfeld, Occidental Chemical Corporation
S.R. Rojstaczer, Occidental Chemical Corporation
J.A. Gardella, State University of New York at Buffalo
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Polyimidesiloxane copolymers (SIM) are becoming increasingly important materials for microelectronic applications due to their excellent adhesive properties, low dielectric constants and good overall thermal and mechanical properties. Hence it is of importance to study the surface and interfacial properties of this polymer system. More recently it has been shown through depth profiling using Electron Spectroscopy for Chemical Analysis (ESCA) that an increase in the siloxane chain length will result in an increase in the thickness of the siloxane layer at the surface.@footnote 1@ The effect of incorporating two or more different siloxane segment lengths into the same copolymer system, on the surface properties, has not been investigated. It is of importance to determine whether or not there is preferential segregation of certain segment lengths over others in SIM copolymers containing multiple siloxane lengths. A series of poly(imidesiloxane) (SIM) copolymers, based on a,w'-aminopropylpoly(dimethylsiloxane) (PDMS) of varying molecular weights, 2,2-bis(4-[4-aminophenoxyl]phenyl)propane (BAPP), and 4,4'-oxydiphthalic anhydride (ODPA) was synthesized in our laboratories. In this series, the total composition of PDMS was maintained at 10%, while the segment length composition of the PDMS was varied (e.g. 5% Mw = 252g/mol, 5% Mw = 832.5g/mol vs. 1% Mw = 252g/mol, 9% Mw = 832.5g/mol). This polymer series was analyzed using ESCA and Time of Flight Secondary Ion Mass Spectroscopy (ToF-SIMS). Angle-dependent ESCA results suggest that there is preferential segregation of the longer PDMS segment lengths to the surface. ToF-SIMS can be used to further confirm the occurance of this preferential segregation. The peel strength of the polymer series to a standard Ni/Fe alloy 42 was measured , and the results correlate well with the ESCA and ToF-SIMS data. @FootnoteText@ @footnote 1@ Zhao, J; Rojstaczer, S.R.; Chen, J.; Xu, M.; Gardella, J.A. Macromolecules. 1999, 32(2), 455.