Adhesion in polypropylene/aluminum laminates made by extrusion coating

Abstract

The purpose of this article is to study how processing parameters can promote adhesion in grafted polypropylene/aluminum laminates made by extrusion coating. The density of bonds created at the interface is quantified by Xray spectroscopy after dissolution of the polymer film. dynamic mechanical analysis (DMA) and tensile tests are performed to characterize the mechanical properties of polymer films. They are linked with the crystalline structure, as revealed by optical microscopy and X-ray diffraction. A numerical model of extrusion coating is used to quantify the impact of cooling conditions on adhesion. A good correlation is found between the temperature history, the formation of bonds, and the mechanical properties of the polymer films. High temperature conditions can improve adhesion by increasing the open time for the reaction and the rate of the chemical reaction between grafted polymer chains and aluminum.

Influence of the Calendering Step on the Adhesion Properties of Coextruded Structures

“…It is now possible to express (from Figures 3 and 4) the peeling force as a function of the density of chemical links ( Figure 5). There is no clear correlation between these two measurements contrarily to what has been observed by Devisme et al (2009) for a polypropylene/aluminium multilayered system made by extrusion coating.…”

Heat seal properties of polymer–aluminum–polymer composite films for application in pouch lithium-ion battery

“…7,[11][12][13][14][15] Most recently, these composite lms have been used in so-packaged or pouch lithium-ion batteries (LIBs). [16][17][18][19] For LIB packaging, composite lms must provide high barrier levels to gas, light, water, and electrolyte corrosion during the service life of the LIB. As a result, trilayer materials are widely used as envelopes for LIB packaging.…”

Influence of lithium hexafluorophosphate/ethylene carbonate/dimethyl carbonate electrolyte soaking on heat seal strength of polyamide 6/aluminum/cast-polypropylene laminates used as lithium-ion battery packaging

“…Most investigators have explored the HSS of fresh heat-sealed package materials. 3–9 Tetsuya et al. 3 and Hashimoto et al.…”

“…Most investigators have explored the HSS of fresh heat-sealed package materials. [3][4][5][6][7][8][9] Tetsuya et al 3 and Hashimoto et al 4 studied how the heatsealing temperature affects the mechanical properties and morphologies of oriented polypropylene (OPP)/cast polypropylene (CPP)-laminated films. Planes et al 5 investigated the heat-sealing properties of composites consisting of one polyethylene (PE) layer and either one or three aluminum-coated polyethylene terephthalate (PET) layers.…”

“…The interfacial peel strength of the GMA-, AA-, and MAH-modified PP significantly improved compared to pure PP. Devisme et al 8 studied how the processing parameters affect adhesion in grafted PP/aluminum laminates. High-temperature conditions were shown to improve adhesion by increasing both reaction time and the chemical reaction rate between the grafted polymer chains and aluminum.…”