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New techniques for in situ characterization of PSAs / Zong Fu Li in ADHESIVES AGE, Vol. 37, N° 13 (12/1994)
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Titre : New techniques for in situ characterization of PSAs Type de document : texte imprimé Auteurs : Zong Fu Li, Auteur ; Robert F. Callahan, Auteur ; Charles Hanson, Auteur Année de publication : 1994 Article en page(s) : p. 44-46 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs sensibles à la pression
Analyse mécanique dynamique
Analyse thermique
CaractérisationIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : Pressure sensitive adhesive systems are typically based on natural and synthetic rubbers, such as poly(styrene-isoprene-styrene) block copolymers and polyisobutylene, elastomeric acrylics and silicones. An essential ingredient in PSAs is a tackifier that typically constitutes 35-50% by weight of the adhesives. Common tackifiers are wood rosins, tall oils and synthetic oligomers.
The most important property of PSAs is their tackiness. To increase the tackiness of PSAs, one could increase the amount of tackifier, but excessive tackifier will reduce the cohesive strength. PSAs should possess a high enough cohesive strength so they will not leave appreciable residuals when peeled from adherend surfaces. In formulating a PSA, an objective is to maximize both the tackiness and cohesive strength of the adhesive. Due to the viscoelastic nature of PSAs, their tackiness determined by any test methods strongly depends on testing conditions. The most common tool to characterize PSA physical properties is dynamic mechanical analysis (DMA), which obtains the glass transition temperature Tg, shear moduli and tan ?. The usefulness of parameters obtained by DMA for designing PSAs is well documented. In doing such a test, bulk adhesives are prepared with a sample thickness of 1 mm. An in-situ DMA test of commercial PSAs with backings, however, is obviously impossible. This article describes a new thermal analysis technique: the thermally stimulated current (TSC) technique for the in-situ characterization of Tg and the viscoelastic relaxation processes of PSAs.Note de contenu : Thermally stimulated currrent En ligne : https://drive.google.com/file/d/1q6hqwWZJyYV88yHL69rtJjbC9phjrwQy/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20809
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