Adhesion between Immiscible Polymers Correlated with Interfacial Entanglements

Adhesion in immiscible, weakly bonded polymeric layered structures is explored. Of particular interest are common commercial polymers used in multilayered packaging materials. Based on the scission of entangled chains at the polymer−polymer interface, a correlation between the critical mechanical en...

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Bibliographic Details
Published in:Macromolecules 2003-04, Vol.36 (8), p.2808-2815
Main Authors: Cole, Phillip J, Cook, Robert F, Macosko, Christopher W
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Surface properties
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Summary:Adhesion in immiscible, weakly bonded polymeric layered structures is explored. Of particular interest are common commercial polymers used in multilayered packaging materials. Based on the scission of entangled chains at the polymer−polymer interface, a correlation between the critical mechanical energy release rate for fracture (G c) and the characteristic number of interfacial entanglements (N ent) is developed. N ent, the ratio of the interfacial width to the average length scale required for entanglement, is calculable for a variety of homopolymers and random copolymers. Results of adhesion tests on melt and solvent laminated samples, coupled with random copolymer data from the literature, verify that a G c ∝ N ent 2 relationship exists. For small N ent, there are insufficient entangled chains to strengthen the interface, and the critical mechanical energy release rate goes to zero. The proposed model offers a method for designing new materials from common immiscible polymer systems.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma020789t