Biosourced Polymeric Emulsifiers for Miniemulsion Copolymerization of Myrcene and Styrene: towards biobased Waterborne Latex as Pickering Emulsion Stabilizer
Résumé
Biobased waterborne latexes were synthesized by miniemulsion radical copolymerization of biosourced -myrcene (My) terpenic monomer and styrene (S). Biobased amphiphilic copolymers were designed to act as stabilizers of the initial monomer droplets and the polymer colloids dispersed in the water phase. Two types of hydrophilic polymer backbones were hydrophobically modified by terpene molecules to synthesize two series of amphiphilic copolymers with various degrees of substitution. The first series consists of poly(acrylic acid) modified with tetrahydrogeraniol moieties (PAA-g-THG) and the second series is based on the polysaccharide carboxymethylpullulan amino-functionalized with dihydromyrcenol moieties (CMP-g-(NH-DHM)). The produced waterborne latexes with diameters between 160 and 300 nm and were composed of polymers with varying glass transition temperatures (Tg, PMy =-60°C, Tg, P(My-coS) =-14°C, Tg, PS = 105 °C) depending on the molar fraction of biobased -myrcene (fMy,0 = 0, 0.43 or 1). The latexes successfully stabilized dodecane-inwater and water-in-dodecane emulsions for months at all compositions. The waterborne latexes composed of low Tg poly(-myrcene) caused interesting different behavior during drying of the emulsions compared to polystyrene latexes.
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20220511_article PMyPS miniemulsion Pickering R2_submission Biomacromolecules.pdf (3.44 Mo)
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