Preparation of sulphonate-containing polymer particles <Emphasis Type="Italic">via</Emphasis> semi-continuous emulsion copolymerizaion of styrene and sodium styrene sulphonate |
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Authors: | Ji-shuai?Wang Yun-shen?Chen Wei?Deng Email author" target="_blank">Cheng-you?KanEmail author |
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Institution: | (**) Department of Chemical Engineering and Key Laboratory of Advanced Materials of Ministry of Education, Tsinghua University,Beijing 100084,China |
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Abstract: | Submicron-sized P(St-NaSS) latexes were prepared via a semi-continuous emulsion copolymerization of styrene (St) and sodium styrene sulphonate (NaSS) in the presence of anionic
surfactant, in which NaSS aqueous solution and St were separately dropwise charged into the polymerization system at the same
time. The hydrodynamic diameter of the latex particles was measured by dynamic light scattering (DSL) method, and the NaSS
unit content of the purified copolymer by water extraction was calculated based on the elementary analysis. Results showed
that the copolymerization could be performed smoothly with the monomer conversion more than 96% in the absence of crosslinker,
and PNaSS homopolymer could be removed from the latex product by water extraction for 28 h. The weight loss in the water extraction
tended to decrease and the NaSS unit content of the purified copolymer tended to increase with the increase of monomer feeding
time, and both of them increased with the increase of NaSS/St mole ratio in the charge. The introduction of divinyl benzene
(DVB) could decrease the weight loss in the water extraction and increase the NaSS unit content of the purified copolymer.
When 25/75 mole ratio of NaSS/St and 11 mol% DVB of total NaSS and St were used in the recipe, and the monomer feeding time
was 3 h in copolymerization, the NaSS unit content of the purified copolymer reached 7.31 mol%. |
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Keywords: | Emulsion polymerization Sulphonate-containing polymer particles Crosslinking Poly(styrene-sodium styrene sulphonate) |
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