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The Reactive Formation of Diblock Copolymer at a Polymer/Polymer Interface and its Effect on Interfacial Structure

Published online by Cambridge University Press:  01 February 2011

Jonathan S. Schulze ,
Timothy P. Lodge  and
Christopher W. Macosko
Jonathan S. Schulze
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis MN 55455, U.S.A.
Timothy P. Lodge
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis MN 55455, U.S.A.
Christopher W. Macosko
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis MN 55455, U.S.A.
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Abstract

The reaction of perdeuterated amino-terminal polystyrene (dPS-NH2) with anhydrideterminal poly(methyl methacrylate) (PMMA-anh) at a PS/PMMA interface has been observed with forward recoil spectrometry (FRES). Bilayer samples were constructed by placing thin films of PS containing ∼8.5 wt % dPS-NH2 on a PMMA-anh layer. Significant reaction was observed only after annealing the samples at 174°C for several hours, a time scale at least two orders of magnitude greater than the time required for the dPS-NH2 chains to diffuse through the bulk PS layer. The topography of the interfacial region as copolymer formed was measured using atomic force microscopy (AFM). Roughening of the PS/PMMA interface was observed to varying degrees in all annealed samples. Furthermore, the extent of this roughening was found to depend on the PS matrix molecular weight. Reaction in the samples with a high molecular weight PS matrix resulted in a root mean square roughness approximately equal to the radius of gyration Rg of the copolymer. However, approximately twice as much roughening was observed in the low molecular weight PS matrix. This study reveals how the molecular weight of one of the phases can affect the rate of reaction at a polymer/polymer interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 629: Symposium FF – Interfaces, Adhesion and Processing in Polymer Systems , 2000 , FF2.2
Copyright
Copyright © Materials Research Society 2000

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References

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