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Poly(methyl methacrylate-co-ethyl acrylate) latex particles with poly(ethylene glycol) grafts: Structure and film formation
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2007 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 23, 3590-3602 p.Article in journal (Refereed)
Abstract [en]

Water-based copolymer dispersions were prepared using methyl methacrylate (MMA), ethyl acrylate (EA) (MMA:EA = 1:2) and a series of nonionic polymerizable surfactants, i.e., “surfmers” based on poly(ethylene glycol)-(meth)acrylates. The latexes were compared with the behavior of a conventionally stabilized (nonionic nonylphenol ethoxylate, NP100 with 84 ethylene oxide units) dispersion with the same MMA-EA composition (PMMAEA). A number of techniques were employed in order to characterize structure, dynamics and film formation properties: solution/solid-state NMR, dynamic/static light scattering (DLS/SLS), differential scanning calorimetry (DSC), tensile/shear mode dynamic mechanical thermal analysis (DMTA) and atomic force microscopy (AFM). The surfmers were found to be miscible with the MMA-EA copolymer at room temperature, with 46–85 mol % of the reacted surfmer detected at the particle surfaces, the remaining part being buried in the particle bulk. In contrast, the NP100 surfactant formed a separate interphase between the copolymer particles with no mixing detected at room temperature or at 90°C. For a 4.0 % dry weight concentration, NP100 phase separated and further crystallized at room temperature over a period of several months. Composition fluctuations related to a limited blockiness on a length scale above ~2 nm were detected for PMMAEA particles, whereas the surfmer particles were found to be homogeneous also below this limit. On a particle-particle level the dispersions tended to form colloidal crystals unless hindered by a broadened particle size distribution or, in the case of PMMAEA, by the action of NP100. Finally, a surface roughness (Rq) master plot was constructed for data above the glass transition temperature (Tg) from Tg+11 °C to Tg+57 °C and compared with the complex shear modulus over 11 frequency decades. Shift factors from the two methods obeyed the same Williams3 Landel-Ferry (WLF) temperature dependence, thus connecting the long-time surface flattening process to the rheological behavior of the copolymer.

Place, publisher, year, edition, pages
2007. Vol. 23, 3590-3602 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27144OAI: oai:DiVA.org:ri-27144DiVA: diva2:1054148
Note
A1874Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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