Preparation and characterization of colloidal dispersions of vinyl alcohol–vinyl acetate copolymers: application as stabilizers for vinyl chloride suspension polymerization
| Autor: | Satha Hong, Bernard Stasik, Clorinthe Labbe, Roxana Albu, Thierry Lasuye, Gérard Riess |
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| Rok vydání: | 2006 |
| Předmět: |
Vinyl alcohol
Coacervate Materials science integumentary system Polymers and Plastics Organic Chemistry Radical polymerization Vinyl chloride chemistry.chemical_compound Polyvinyl chloride chemistry Chemical engineering Polymer chemistry Materials Chemistry Vinyl acetate Copolymer Suspension polymerization |
| Zdroj: | Polymer International. 55:1426-1434 |
| ISSN: | 1097-0126 0959-8103 |
| Popis: | Well-defined colloidal dispersions of vinyl alcohol–vinyl acetate copolymers (PVAs) with different degrees of hydrolysis (DH) were prepared by a coacervation technique. Colloidal particles in the size range 150–250 nm, with an acetate-rich core and a hydrophilic PVA corona, were obtained using a combination of a hydrophobic PVA (PVA II) having an average DH () value of 43 mol% with a ‘blocky’ hydrophilic PVA (PVA I) with a value of 72 mol%. The core–shell structure of these particles was demonstrated using 1H NMR and using fluorescence-labelled PVA I. The stabilization efficiency of PVA I and PVA II and their combination was examined for 1-chlorobutane–water emulsions, as a ‘model solvent’ for vinyl chloride–water emulsions. Preliminary tests of vinyl chloride suspension polymerization confirmed the beneficial effect of PVA I and PVA II combinations as stabilizers on the granulometry and the porosity specifications of the poly(vinyl chloride) grains. Copyright © 2006 Society of Chemical Industry |
| Databáze: | OpenAIRE |
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