Abstract
The adhesion between aluminum (Al) foil and cast polypropylene (CPP) film laminated with mixtures of amorphous- and crystalline-maleic anhydride-grafted ethylene-propylene-diene monomer (MAH-g-EPDM) rubbers and highly reactive polybutene (HRPB) as the adhesives was investigated. Specifically, the HRPB was used as an adhesion promoter of the MAH-g-EPDM rubbers and CPP as well as a compatibilizer of two kinds of MAH-g-EPDM rubbers having limited miscibility. To introduce strong chemical bonds between the MAH-g-EPDM rubbers and Al foil, the surface of Al foil was treated with 3-aminopropyl triethoxysilane (APTES). The weak adhesion between Al foil and MAH-g-EPDM rubbers was improved by imidization between the amine groups (–NH2) of APTES and the maleic anhydride groups (MAH) of MAH-g-EPDM rubbers. The effects of the composition of adhesives, tempering time and adhesive thickness were also studied to optimize the adhesion of the CPP/Al foil laminates. We concluded that MAH-g-EPDM rubber based adhesives containing HRPB can be applied for the lamination of Al foil and CPP films to satisfy the requirements of high-performance packaging materials for various purposes.
Highlights
Aluminum (Al) foils are widely used as protective materials in coating and packaging in electronic devices because of their resistance against air and moisture [1,2,3,4,5]
Adhesion Based on Ethylene-propylene-diene monomer (EPDM)-A, EPDM-C and highly reactive polybutene (HRPB)
These findings strongly suggest significant findings suggestthe that a significant in peel strength depending onthat theathickness is increase in peel strength depending on the thickness is possible with strong adhesion of EPDM-B-15, possible with strong adhesion of EPDM-B-15, with both aminopropyl triethoxysilane (APTES)-treated Al foil and cast polypropylene (CPP) exhibiting with bothfailure
Summary
Aluminum (Al) foils are widely used as protective materials in coating and packaging in electronic devices because of their resistance against air and moisture [1,2,3,4,5]. 30% crystalline PP (EPDM-C) and amorphous MAH-g-EPDM rubber (EPDM-A), were used as a mixture for adhesion between Al foil and CPP This was done because EPDM-C can largely improve mechanical properties as well as expand the film’s applications while EPDM-A can impart easy film formation [25,26,27,28,29]. The HRPB played important role as an excellent compatibilizer for MAH-g-EPDM rubbers and a latent crosslinker for the adhesives and CPP, resulting in a great improvement in the peel strength of CPP/Al foil laminates. Introducing strong imide bond at the interface between Al foil and MAH-g-EPDM rubbers accompanied the largely enhanced the peel strength of CPP/Al foil laminates causing the cohesive failures in 180◦ peel test. The prepared adhesive showed good compatibility with CPP and the introduction of imide bonds at the interface between MAH-g-EPDM rubbers and Al foil greatly improved the peel strength of CPP/Al foil laminates. We studied the effects of the composition of adhesives, adhesive thickness and tempering on the peel strength of CPP/Al foil laminates for practical applications
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