Tuning the aggregation and redispersion behavior of CO^sub 2^-switchable latexes by a combination of DMAEMA and PDMAEMA-b-PMMA as stabilizing moieties

We have prepared CO2-switchable poly(methyl methacrylate) and polystyrene latexes where the stabilizing CO2-switchable moiety originated from either the monomer 2-dimethylaminoethyl methacrylate (DMAEMA) (copolymerized in situ) or previously synthesized poly(2-dimethylaminoethyl methacrylate)-block-...

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Bibliographic Details
Published inPolymer (Guilford) Vol. 106; p. 303
Main Authors Shirin-Abadi, Abbas Rezaee, Darabi, Ali, Jessop, Philip G, Cunningham, Michael F
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier BV 05.12.2016
Subjects
Agglomeration
Aggregation behavior
Block copolymers
Bubbling
Carbon dioxide
Chemical elements
Chemical synthesis
Copolymerization
Copolymers
Polymethyl methacrylate
Polymethylmethacrylate
Polystyrene
Polystyrene resins
Sonication
Studies
Switching
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Summary:We have prepared CO2-switchable poly(methyl methacrylate) and polystyrene latexes where the stabilizing CO2-switchable moiety originated from either the monomer 2-dimethylaminoethyl methacrylate (DMAEMA) (copolymerized in situ) or previously synthesized poly(2-dimethylaminoethyl methacrylate)-block-poly(methyl methacrylate) (PDMAEMA-b-PMMA). The latexes can be aggregated by N2 and heat, and redispersed through CO2 bubbling and sonication. These two methods of incorporating the CO2-responsive groups yield quite different switching behavior. Using PDMAEMA-b-PMMA as the only switchable compound produced latexes that are easily aggregated, however the redispersion step required relatively high energy input. In contrast when the stabilizing moieties originated from DMAEMA monomer copolymerized in situ, the latexes exhibit the opposite behavior: aggregation is difficult but redispersion is easier. By combining the use of both in situ polymerized DMAEMA monomer and PDMAEMA-b-PMMA, we were able to produce latexes with tunable aggregation and redispersion behavior.
ISSN:0032-3861
1873-2291