Adhesion of ethylene-octene copolymers to polypropylene: Interfacial structure and mechanical properties

• Published in: Journal of adhesion science and technology Vol. 15; no. 11; pp. 1285 - 1304
• Main Authors: Godail, L., Packham, D. E.
• Format: Journal Article
• Language: English
• Published: Leiden Taylor & Francis Group 01.01.2001; Brill
• Subjects: ADHESION VARIATION WITH TEMPERATURE; Applied sciences; ETHYLENE-OCTENE COPOLYMERS; Exact sciences and technology; FLORY-HUGGINS INTERACTION PARAMETER; INTERPENETRATION OF CHAINS; MORPHOLOGY; Organic polymers; PEEL TEST; Physicochemistry of polymers; POLYPROPYLENE; Properties and characterization; Surface properties; TRANSCRYSTALLINE LAYER; Interface structure; Interface properties; Adhesivity; Olefin copolymer; Solid solid interface; Propylene polymer; Ethylene copolymer; Experimental study; Property processing relationship; Compression molding
• ISSN: 0169-4243; 1568-5616
• DOI: 10.1163/15685610152599359

Four separate ethylene-octene copolymers of differing molecular weight and co-monomer content have been moulded against polypropylene at various temperatures between 120 and 200°C. The adhesion, measured by a 90° peel test, varied with the particular copolymer, but for all of them it varied with moulding temperature, showing a maximum at about 160°C. It is argued that the temperature variation depends on the extent to which interpenetration of chains occurs in the interfacial region. This, in turn, depends on the recrystallization temperature of the polypropylene. The relative magnitudes of peel energy for the different copolymers can be understood in terms of the extent of plastic yielding necessary in order to transmit a critical stress to the interfacial regions during peeling.