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Ion Beam Analysis of Diffusion in Polymer Melts

Published online by Cambridge University Press:  22 February 2011

P. F. Green ,
P. J. Mills ,
C. J. Palmstrom ,
J. W. Mayer  and
E. J. Kramer
P. F. Green
Affiliation:
Dept. of Materials Science and Engineering and the Materials Science Center, Cornell University, Ithaca, NY 14853
P. J. Mills
Affiliation:
Dept. of Materials Science and Engineering and the Materials Science Center, Cornell University, Ithaca, NY 14853
C. J. Palmstrom
Affiliation:
Dept. of Materials Science and Engineering and the Materials Science Center, Cornell University, Ithaca, NY 14853
J. W. Mayer
Affiliation:
Dept. of Materials Science and Engineering and the Materials Science Center, Cornell University, Ithaca, NY 14853
E. J. Kramer
Affiliation:
Dept. of Materials Science and Engineering and the Materials Science Center, Cornell University, Ithaca, NY 14853
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Abstract

Two ion beam depth profiling methods have been used to measure the diffusion of polymer chains of molecular weight M into a matrix of polymer of molecular weight P. In the first the displacement xm of Au markers at the original interface of a diffusion couple between polystyrene with P=2×107 and a thin film of PS with M<P is measured using Rutherford backscattering spectrometry. From this modern version of the Kirkendall effect we find x=0.4t8(D*t) 0 5, where D* the tracer diffusion coefficient of the M chains at 174°C, is found to be D*=O.007M−2cm2/sec, in good agreement with the D*=DR expected for the reptation mechanism. Forward recoil spectrometry, a technique in which the energies of recoiling deuterons are detected, is used to obtain concentration profiles, and hence D*, of deuterated PS M-chains diffusing into a hydrogenated PS P-chain matrix. When P>>M, D*=0.008M−2, in good agreement with the marker data. When P<P*(M) however D*; increases greatly as P decreases; P* increases slowly with increasing M. The results are predicted quantitatively by D*=DR+DCR, where DCR=0.10Me2/(Mp 3 ) describes the diffusion of the M-chain by release of its topological constraints (by diffusion of the surrounding P-chains) and Me is an entanglement molecular weight. D* for self-diffusion (M=P) is dominated by reptation except for M's close to Me.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 40: Symposium J – Electronic Packaging Materials Science I , 1984 , 265
Copyright
Copyright © Materials Research Society 1985

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