| Titre : |
Polymer-leather composites. VI. Mechanism of deposition of selected acrylate monomers by polymerization into 5-ounce chrome-tanned cattlehide |
| Type de document : |
texte imprimé |
| Auteurs : |
E. F. Jordan, Auteur ; Bohdan Artymyshyn, Auteur ; Stephen H. Feairheller, Auteur |
| Année de publication : |
1982 |
| Article en page(s) : |
p. 332-357 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages.
Cuirs et peaux
Monomères
Polymères
Polymérisation
Tannage au chrome
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Three acrylate monomers, methyl methacrylate, n-butyl acrylate, and a comonomer mixture of fixed n-butyl acrylate ( 59 percent ) and methyl methacrylate, were polymerized into 5-oz cattlehide by two processes. In one, the monomers were polymerized into the fibrous matrix by the standard emulsion process developed at this Center using a potassium persulfate-sodium bisulfite redox initiating system at room temperature. In the other, the same three monomers were introduced by bulk or solution polymerization into acetone-dried panels in a closed system at 60 degree. The rate of change of density with composition was completely different for the two types of composites. The widest range of composition was studied, far exceeding the practical range, to provide basic information on the mechanism of deposition and bound polymer formation for the emulsion process. It was observed that both the efficiency of producing chemically bound polymer and the number of polymer branches on the collagen declined as monomer content was incrementally increased. Because branch frequency thus decreased compared with the theoretical maximum, a controlling grafting mechanism was precluded. Characteristic kinetic constants that reflected the influence of changes in reaction variables indicated that deposition was controlled by emulsion polymer instability rather than being influenced by grafting. A mechanism was suggested involving aggregation of polymer in leather by coalescence of emulsion particles to form macrodimensional layers near the surfaces of cattlehide, fed by monomer diffusing to rapidly accumulating occluded radicals. Polymer-polymer crosslinking and strong adsorption of polymer coils to fiber surfaces accompanied by some surface grafting produced the bound polymer in this scheme. |
| Note de contenu : |
- EXPERIMENTAL : Polymerization procedure - Physical properties
- RESULTS AND DISCUSSION : A. Polymerization principles and composite formation concepts - B. Results, general features - C. Systems and deposition efficiencies - D. Density and plumping of the composites |
| En ligne : |
https://drive.google.com/file/d/1mR-JTWQ20dQNZ-6BPeZa5t2BYYl-B5ZJ/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17462 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XXVII (Année 1982) . - p. 332-357
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