Improving adhesion of high vinyl (SVS) polymers using modified diblocks / D. F. Graves in ADHESIVES AGE, Vol. 40, N° 12 (11/1997)  

[article]  inADHESIVES AGE > Vol. 40, N° 12 (11/1997) . - p. 51-55 Titre : Improving adhesion of high vinyl (SVS) polymers using modified diblocks Type de document : texte imprimé Auteurs : D. F. Graves, Auteur ; D. D. Tondra, Auteur Année de publication : 1997 Article en page(s) : p. 51-55 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs sensibles à la pression Adhésifs thermofusibles Copolymère styrène butadiène styrène Copolymères séquencés Diméthylacrylamide Vinylpyridine Index. décimale : 668.3 Adhésifs et produits semblables Résumé : This study again shows that the adhesion of the new high vinyl block polymers (SVS) to non-polar substrates can be improved by adding diblock to the PSA mixture. Although work at still lower molecular weight needs to be done, it was shown that a diblock at about 40K is a better modifier than a higher MW diblock (100K). It was also shown that without vinylpyridine in the diblock structure, the all initial charge polymers (tapered blocks) were better than the sequential monomer addition (true blocks). Polar functionality, in general, improved adhesion to the tested substrates. In this study the functional groups were always blocked on the chain ends, either as a single unit or in the case of dimethylacrylamide (DMA) or vinylpyridine (VP), a low molecular weight block. Simple termination with an OH group seemed to work best for improving quick stick and adhesion to PP when placed at the end of an S/B tapered block structure. Also, as the level of either DMA or VP was increased, the adhesion improved. A future study will look at higher amounts of these two monomers. Adhesion to other subtrates would most likely be improved by the addition of different functional groups, such as alkoxysilane end-groups improving adhesion to glass. This will also be the subject of a future study. The introduction of an ionic network into the PSA from the quaternization of the VP blocks also showed some potential for improving adhesion. Again, more work is needed in this area with additional substrates. Note de contenu : - EXPERIMENTAL : Diblocks - Formulations - Sample preparation - TESTING : Quick stick 90° angle to stainless steel (SS) - 180° peel adhesion to PE or PP En ligne : https://drive.google.com/file/d/1maYZljfGuzeSJENMxHmBSk6GfBJGX9jB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20463 [article]

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