Emulsion Polymerization

Aerdts, Annemieke M.; Herk, Alex M. van; Klumperman, Bert; Kurja, Jenci; German, Anton L.

doi:10.1002/9783527603978.mst0231

Cited by 1 publication

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“…The high aqueous solubility and high activated AN‐free radical may have contributed for the regional identification of PAN in the shell area. In principle, the emulsion graft copolymerization happens within dispersed surfactant micelles and among nearby rubber particles 47‐49 . Although both ST and AN monomers are localized in the emulsified droplets, the amount of monomers is varied due to water solubility of each monomer.…”

Section: Resultsmentioning

confidence: 99%

Improvement of thermal properties of Vietnam deproteinized natural rubber via graft copolymerization with styrene/acrylonitrile and diimide transfer hydrogenation

Duy

Rimdusit

Quang

et al. 2020

Polymers for Advanced Techs

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In this study, we investigated the improvement of thermal properties of Vietnam deproteinized natural rubber (DPNR) via graft copolymerization of styrene/acrylonitrile and transfer hydrogenation. The graft copolymerization was achieved successfully in the latex stage using tert‐butyl hydroperoxide and tetraethylenepentamine as radical initiators at 30°C. The obtained graft copolymer was hydrogenated by a diimide reduction system in the presence of different copper (II) homogeneous catalysts. The effects of styrene to acrylonitrile on the total conversion and the grafting efficiency have been studied. The structural characterization of the obtained copolymers was made by 1H NMR and ATR‐FTIR. The graft DPNR was then characterized by gel permeation chromatography (GPC). The effects of different copper (II) catalysts on the system have been evaluated by the hydrogenation degree of each hydrogenated sample. The improvement of the thermal properties of the graft copolymers was confirmed by thermal gravimetric analysis/differential thermal analysis. The core‐shell arrangement was obtained in both DPNR‐graft‐PS/PAN and hydrogenated‐DPNR‐graft‐PS/PAN by transmission electron microscopy.

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Section: Resultsmentioning

confidence: 99%