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Soluble complexes i...
Soluble complexes in aqueous mixtures of low charge density comb polyelectrolyte and oppositely charged surfactant probed by scattering and NMR
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- Bastardo Zambrano, Luis Alejandro (författare)
- KTH,Ytkemi
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- Iruthayaraj, Joseph (författare)
- KTH,Ytkemi
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- Lundin, Maria (författare)
- KTH,Ytkemi
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- Dédinaité, Andra (författare)
- KTH,RISE,YKI – Ytkemiska institutet,Ytkemi
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- Vareikis, A (författare)
- Department of Polymer Chemistry, Vilnius University
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- Makuska, R (författare)
- Department of Polymer Chemistry, Vilnius University
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- van der Wal, Albert (författare)
- Lever Faberage Europe Global Technology Centre, Unilever R and D
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- Furó, István (författare)
- KTH,Fysikalisk kemi
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- Garamus, Vasil M. (författare)
- GKSS Research Centre
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- Claesson, Per M. (författare)
- KTH,Ytkemi
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(creator_code:org_t)
- Elsevier BV, 2007
- 2007
- Engelska.
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Ingår i: Journal of Colloid and Interface Science. - : Elsevier BV. - 0021-9797 .- 1095-7103. ; 312, s. 21-33
- Relaterad länk:
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A low charge density polyelectrolyte with a high graft density of 45 units long poly(ethylene oxide) side-chains has been synthesized. In this comb polymer, denoted PEO45 MEMA:METAC-2, 2 mol% of the repeating methacrylate units in the polymer backbone carry a permanent positive charge and the remaining 98 mol% a 45 unit long PEO side-chain. Here we describe the solution conformation of this polymer and its association with an anionic surfactant, sodium dodecylsulfate, SDS. It will be shown that the polymer can be viewed as a stiff rod with a cross-section radius of gyration of 29 Å. The cross section of the rod contracts with increasing temperature due to decreased solvency of the PEO side-chains. The anionic surfactant associates to a significant degree with PEO45 MEMA:METAC-2 to form soluble complexes at all stoichiometries. A cooperative association is observed as the free SDS concentration approaches 7 mM. At saturation the number of SDS molecules associated with the polymer amounts to 10 for each PEO side-chain. Two distinct populations of associated surfactants are observed, one is suggested to be molecularly distributed over the comb polymer and the other constitutes small micellar-like structures at the periphery of the aggregate. These conclusions are reached based on results from small-angle neutron scattering, static light scattering, NMR, and surface tension measurements.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Nyckelord
- Comb polymer
- Comb polyelectrolyte
- Polymer–surfactant association
- Polyelectrolyte–surfactant aggregate
- Small-angle neutron scattering
- Light scattering
- NMR
- Surface tension
- Polyelectrolyte
- Surfactant
- SDS
- Surface and colloid chemistry
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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