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Maltodextrin as stabilizer for emulsion polymerization: Adsorption and grafting behavior
Author(s) -
Ferrari Raffaele,
Storti Giuseppe,
Morbidelli Massimo
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20200083
Subject(s) - maltodextrin , emulsion polymerization , polymer chemistry , pickering emulsion , emulsion , monomer , chemical engineering , methacrylic acid , polymerization , adsorption , chemistry , materials science , butyl acrylate , styrene , polymer , copolymer , acrylate , organic chemistry , spray drying , engineering
Emulsion polymerization of the three‐monomer system butyl acrylate–styrene–methacrylic acid was performed in batch using a commercial maltodextrin derived from starch degradation as stabilizer. Stable latexes with narrow particle size distributions were obtained in all examined cases. A method was developed to analyze and quantify the partitioning of the maltodextrin between the continuous phase (supernatant) and the particle phase. Significant differences between the polysaccharides adsorbed onto particles with or without emulsion polymerization reaction were observed. The possible reactions of maltodextrin in presence of a radical initiator were studied in aqueous phase, thus confirming maltodextrin degradation. The formation of copolymers involving the original monomers and the stabilizer according to two different reactive pathways was also confirmed. In terms of adsorbed maltodextrin, two different contributions were observed: maltodextrin physically adsorbed and maltodextrin chemically grafted and/or physically incorporated into the polymer.