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Effect of Oxygen Plasma Treatments on Polypropylene-Epoxy Interfacial Strength

Published online by Cambridge University Press:  22 February 2011

E. Occhiello ,
M. Morra ,
G. Morini  and
F. Garbassi
E. Occhiello
Affiliation:
Istituto Guido Donegani S.p.A., Via G. Fauser 4, 28100 Novara, ITALY
M. Morra
Affiliation:
Istituto Guido Donegani S.p.A., Via G. Fauser 4, 28100 Novara, ITALY
G. Morini
Affiliation:
Istituto Guido Donegani S.p.A., Via G. Fauser 4, 28100 Novara, ITALY
F. Garbassi
Affiliation:
Istituto Guido Donegani S.p.A., Via G. Fauser 4, 28100 Novara, ITALY
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Abstract

The effect of oxygen plasma treatment on adhesion and surface properties of polypropylene (PP) was assessed. An oxygen rich modified PP layer, immiscible with bulk PP, was formed by the treatment. Contact angle measurements showed that macromolecular motions led with time to rearrangements of the surface layer drastically decreasing its wettability, while its composition, measured by XPS, remained unaffected.

The shear strength of PP-epoxy joints increased after plasma treatment. The locus of failure was found to occur at the PP/epoxy interface for untreated PP, within PP in the case of oxygen-plasma-treated samples, close to the modified PP/bulk PP interface. This result suggests that the plasma treament improves the interaction at the PP/epoxy interface, but weakens the mechanical strength of the surface layer thereby creating a weak point at the modified PP/bulk PP interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 153: Symposium J – Interfaces Between Polymers, Metals, and Ceramics , 1989 , 199
Copyright
Copyright © Materials Research Society 1989

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