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New insights into t...
New insights into the structure of polyelectrolyte complexes
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- Gärdlund, Linda (författare)
- Mittuniversitetet,Institutionen för naturvetenskap (-2008),FSCN – Fibre Science and Communication Network
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- Wågberg, Lars (författare)
- KTH,Fiber- och polymerteknologi,Royal Institute of Technology, Stockholm
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- Norgren, Magnus (författare)
- Mittuniversitetet,Institutionen för naturvetenskap (-2008)
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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. ; 312:2, s. 237-246
- Relaterad länk:
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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
- The formation of polyelectrolyte complexes (PECs) from oppositely charged linear polyelectrolytes (PELs) was studied using static light scattering at various salt concentrations. The PELs used were poly(allylamine hydro chloride) (PAH) and the two polyanions poly(acrylic acid) (PAA) and poly(methacrylic acid) (PMAA). Physical characteristics such as the radii of gyration, molecular weights, and water contents of the PECs were determined at various molar mixing ratios. Despite relatively small differences in chemical structure between PAA and PMAA, fairly large differences were detected in these physical characteristics. Generally, PECs comprising PMAA were larger and contained more water. Moreover, by using cryogenic transmission electron microscopy, transmission microscopy and atomic force microscopy, shape and structure of the prepared PECs were investigated both in solution and after drying. The PECs were found to be spherical in solution and the shape was retained after freeze-drying. PECs adsorbed on silica surfaces and dried in air at room-temperature still showed a three-dimensional structure. However, the relatively low aspect ratios indicated that the PECs collapsed significantly due to interactions with the silica during adsorption and drying. At intermediate ionic strengths (1-10 mM), stagnation point adsorption reflectometry (SPAR) showed that the adsorption oflow charged cationic PAH-PAA PECs on silica surfaces increased if the pH value was increased from pH 5.5 to 7.5.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
Nyckelord
- polyelectrolyte complex
- poly(acrylic acid)
- poly(niethacrylic acid)
- poly(allylamine hydro chloride)
- structure
- water content
- Cryo-TEM
- AFM
- light scattering
- poly-electrolyte complexes
- light-scattering
- supermolecular structures
- cationic polymers
- adsorption
- dispersions
- improvement
- microscopy
- particles
- strength
- Cellulose and paper engineering
- Cellulosa- och pappersteknik
- Chemical engineering
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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