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Electrolytically assisted debonding of adhesives: An experimental investigation
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.ORCID iD: 0000-0001-5816-2924
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2012 (English)In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 32, 39-45 p.Article in journal (Refereed) Published
Abstract [en]

The technology of electrically assisted delamination has potential applications in many fields, such as easy-to-open consumer packaging and recycling of lightweight materials. A better understanding about the mechanisms leading to debonding is important for further development of the technique, and is a goal of this study. A functional epoxy-based adhesive, applied between two aluminum foils, has been investigated using electrochemical and surface analytical techniques. Delamination occurred at the anodic adhesive boundary, which became acidic during polarization. The reactions during polarization of the laminates consisted of two steps, with aluminum oxide/hydroxide formation as the first and the build-up of a sulfur rich organic film as the second. Several possible debonding processes are discussed.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 32, 39-45 p.
Keyword [en]
Aluminum and alloys, Delamination, Ionic liquid, Epoxy/epoxides
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-70028DOI: 10.1016/j.ijadhadh.2011.09.003ISI: 000298776300004ScopusID: 2-s2.0-81955160681OAI: diva2:486096

QC 20120130

Available from: 2012-01-30 Created: 2012-01-30 Last updated: 2013-04-16Bibliographically approved
In thesis
1. Preparation and Characterization of Electrochemical Devices for Energy Storage and Debonding
Open this publication in new window or tab >>Preparation and Characterization of Electrochemical Devices for Energy Storage and Debonding
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Within the framework of this thesis, three innovative electrochemical devices have been studied. A part of the work is devoted to an already existing device, laminates which are debonded by the application of a voltage. This type of material can potentially be used in a wide range of applications, including adhesive joints in vehicles to both reduce the total weight and to simplify the disassembly after end-of-life, enabling an inexpensive recycling process. Although already a functioning device, the development and tailoring of this process was slowed by a lack of knowledge concerning the actual electrochemical processes responsible for the debonding. The laminate studied consisted of an epoxy adhesive, mixed with an ionic liquid, bonding two aluminium foils. The results showed that the electrochemical reaction taking place at the releasing anode interface caused a very large increase in potential during galvanostatic polarization. Scanning electron microscopy images showed reaction products growing out from the electrode surface into the adhesive. These reaction products were believed to cause the debonding through swelling of the anodic interface so rupturing the adhesive bond.

The other part of the work in this thesis was aimed at innovative lithium ion (Li‑ion) battery concepts. Commercial Li-ion batteries are two-dimensional thin film constructions utilized in most often mechanically rigid products. Two routes were followed in this thesis. In the first, the aim was flexible batteries that could be used in applications such as bendable reading devices. For this purpose, nano-fibrillated cellulose was used as binder material to make flexible battery components. This was achieved through a water-based filtration process, creating flexible and strong papers. These paper-based battery components showed good mechanical properties as well as good rate capabilities during cycling. The drawback using this method was relatively low coulombic efficiencies believed to originate from side-reactions caused by water remnants in the cellulose structure. The second Li-ion battery route comprised an electrochemical process to coat carbon fibers, shown to perform well as negative electrode in Li-ion batteries, from a monomer solution. The resulting polymer coatings were ~500 nm thick and contained lithium ions. This process could be controlled by mainly salt content in the monomer solution and polarization time, yielding thin and apparently pin-hole free coatings. By utilizing the carbon fiber/polymer composite as integrated electrode and electrolyte, a variety of battery designs could possibly be created, such as three-dimensional batteries and structural batteries.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. 71 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2013:13
adhesives, carbon fiber, debonding, delamination, electropolymerization, flexible battery, lithium-ion battery, paper battery
National Category
Chemical Engineering
urn:nbn:se:kth:diva-120199 (URN)978-91-7501-685-6 (ISBN)
Public defence
2013-04-18, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)

QC 20130403

Available from: 2013-04-03 Created: 2013-04-02 Last updated: 2013-04-03Bibliographically approved

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Leijonmarck, SimonCornell, AnnÅkermark, TorbjörnLindbergh, Göran
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International Journal of Adhesion and Adhesives
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