Development of improved polypropylene adhesive bonding by abrasion and atmospheric plasma surface modifications

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dc.contributor.author Encinas, N.
dc.contributor.author Abenojar Buendía, Juana
dc.contributor.author Martínez Casanova, Miguel Ángel
dc.date.accessioned 2016-05-24T13:00:46Z
dc.date.available 2016-05-24T13:00:46Z
dc.date.issued 2012-03
dc.identifier.bibliographicCitation International journal of adhesion & adhesives 33 (2012), pp. 1-6
dc.identifier.issn 0143-7496
dc.identifier.uri http://hdl.handle.net/10016/23082
dc.description.abstract The present work deals with the problematic adhesive bonding of substrates with low surface energy. Different approaches have been explored with the aim of creating adequate adhesive joints based on polyolefinic substrate and polyurethane adhesive. The selected material under study was polypropylene (PP) as adherend, and a commercial Sikaflex®-252 polyurethane one component based structural adhesive (PU) as joint fluid. Among the diverse pre-treatments typically used to prepare surfaces prior to bonding, mechanical abrasion with emery paper of 80 grain size, the use of a chemical primer and atmospheric pressure air plasma torch (APPT) were the selected methods to facilitate the application of the PU by means of surface energy enhancement as well as to create a correct mechanical interlocking of the adherent-adhesive interface. Changes in the wettability of the polymer were evaluated by contact angle measurements following the UNE EN 828:2010. Surface energy was calculated both in terms of Owens approximation and acid-base considerations, leading to the possibility of determining a relationship between changes in surface energy and adhesion. Changes in the chemical composition of the surface were studied by X-ray photoelectron spectroscopy (XPS), electron diffraction X-Ray (EDX) probe and attenuated total multiple reflection mode infrared spectroscopy (ATR-FTIR). Morphological modifications were investigated with scanning electron microscopy (SEM). Variations in the strength of single-lap PP-PP joints with the treatments were evaluated by lap shear tests following the UNE-EN 1465:2008 standard. Experimental evidence supports the superiority of the APPT treatment to increase wettability and adhesion of polyolefinic surfaces, especially when combined with the use of a primer.
dc.description.sponsorship Financial support from the Universidad Carlos III de Madrid Foundation and Chemistry and Materials Technological Institute ‘‘Álvaro Alonso Barba’’ is acknowledged. Also Sika S.A.U (Spain) is acknowledged.
dc.format.extent 6
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier Ltd.
dc.relation.ispartof http://hdl.handle.net/10016/16155
dc.rights © 2011 Elsevier Ltd.
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Polymeric surface preparation
dc.subject.other Wettability
dc.subject.other Lewis acid and base
dc.subject.other Work of adhesion
dc.subject.other Atmospheric pressure plasma torch
dc.subject.other Primer
dc.subject.other Polyurethane
dc.subject.other Polypropylene
dc.subject.other Adhesion
dc.title Development of improved polypropylene adhesive bonding by abrasion and atmospheric plasma surface modifications
dc.type article
dc.relation.publisherversion http://dx.doi.org/10.1016/j.ijadhadh.2011.10.002
dc.subject.eciencia Materiales
dc.identifier.doi 10.1016/j.ijadhadh.2011.10.002
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationlastpage 6
dc.identifier.publicationtitle International journal of adhesion & adhesives
dc.identifier.publicationvolume 33
dc.identifier.uxxi AR/0000009727
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