PEO-PPO-PEO Block Copolymers at the Emulsion Droplet-Water Interface Export

@article{citeulike:3515154, abstract = {Abstract: potential measurements were used to determine the adsorbed layer thickness of poly(ethylene oxide)-polypropylene oxide-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers at the surfaces of poly(dimethylsiloxane) emulsion droplets, silica particles, and polystyrene latex particles. The adsorbed layer thickness () was shown to depend on the copolymer structure, the surface chemistry of the adsorbent, and the level of cross-linking within droplets. For a wide range of copolymers, values are in the range 2-20 nm and directly proportional to the PEO block length. For copolymers with PEO segment lengths > PPO segment lengths, the plateau values for PDMS, latex, and silica correspond to \~{}35\%, 20\%, and 7\% of the fully extended PEO segment length. Equivalent values for copolymers with PEO segment lengths < PPO segment lengths are significantly greater but follow the same dependence on the type of adsorbent. As the level of internal cross-linking within the PDMS droplets was increased, the interface became less deformable and the adsorbed copolymer layer thickness significantly decreased. Findings are discussed with respect to the adsorbed copolymer conformations, which result from different adsorption mechanisms and the influence of interfacial penetrability.}, address = {Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia}, author = {Barnes, T. J. and Prestidge, C. A.}, citeulike-article-id = {3515154}, citeulike-linkout-0 = {http://dx.doi.org/10.1021/la991217d}, citeulike-linkout-1 = {http://pubs.acs.org/doi/abs/10.1021/la991217d}, day = {2}, doi = {10.1021/la991217d}, journal = {Langmuir}, keywords = {pluronic}, month = {May}, number = {9}, pages = {4116--4121}, posted-at = {2008-11-14 22:16:15}, priority = {4}, title = {PEO-PPO-PEO Block Copolymers at the Emulsion Droplet-Water Interface}, url = {http://dx.doi.org/10.1021/la991217d}, volume = {16}, year = {2000} }

TY - JOUR ID - citeulike:3515154 L3 - citeulike-article-id:3515154 N2 - Abstract: potential measurements were used to determine the adsorbed layer thickness of poly(ethylene oxide)-polypropylene oxide-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers at the surfaces of poly(dimethylsiloxane) emulsion droplets, silica particles, and polystyrene latex particles. The adsorbed layer thickness () was shown to depend on the copolymer structure, the surface chemistry of the adsorbent, and the level of cross-linking within droplets. For a wide range of copolymers, values are in the range 2-20 nm and directly proportional to the PEO block length. For copolymers with PEO segment lengths > PPO segment lengths, the plateau values for PDMS, latex, and silica correspond to ~35%, 20%, and 7% of the fully extended PEO segment length. Equivalent values for copolymers with PEO segment lengths < PPO segment lengths are significantly greater but follow the same dependence on the type of adsorbent. As the level of internal cross-linking within the PDMS droplets was increased, the interface became less deformable and the adsorbed copolymer layer thickness significantly decreased. Findings are discussed with respect to the adsorbed copolymer conformations, which result from different adsorption mechanisms and the influence of interfacial penetrability. IS - 9 JF - Langmuir AD - Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia EP - 4121 TI - PEO-PPO-PEO Block Copolymers at the Emulsion Droplet-Water Interface VL - 16 SP - 4116 KW - pluronic AU - Barnes, TJ AU - Prestidge, CA PY - 2000/05/02/ UR - http://dx.doi.org/10.1021/la991217d ER -