Shear induced structures in lamellar phases of amphiphilic block copolymers
作者： Johannes Zipfel , Jörg Berghausen , Gudrun Schmidt , Peter Lindner , Paschalis Alexandridis
DOI: 10.1039/A904014E
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摘要: The influence of shear on the mesoscopic structure in lamellar region ternary poly(ethylene oxide)–b-poly(propylene oxide)–b-poly(ethylene oxide) block copolymers PEO20–b-PPO70–b-PEO20 and PEO100–b-PPO70–b-PEO100 (Pluronic P123 F127)/water/butanol systems was investigated by different techniques namely: small angle neutron light scattering (SANS, SALS), as well birefringence. A transition from parallel to perpendicular alignment lamellae, with a corresponding decrease viscosity, found increasing rate at high copolymer concentrations. However, shear-induced formation multilamellar vesicles (“onions’') observed when polymer concentration reduced.
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