Sphere-to-rod transition of triblock copolymer micelles at room temperature |
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| Authors: | R Ganguly V K Aswal P A Hassan I K Gopalakrishnan J V Yakhmi |
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| Institution: | (1) Novel Materials and Structural Chemistry Division, Bhabha Atomic Research Centre, 400 085 Mumbai, India;(2) Solid State Physics Division, Bhabha Atomic Research Centre, 400 085 Mumbai, India;(3) TP&PED, Bhabha Atomic Research Centre, 400 085 Mumbai, India |
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| Abstract: | A room temperature sphere-to-rod transition of the polyethylene oxide-polypropylene oxide-polyethylene oxide-based triblock
copolymer, (PEO)20(PPO)70 (PEO)20 micelles have been observed in aqueous medium under the influence of ethanol and sodium chloride. Addition of 5–10% ethanol
induces a high temperature sphere-to-rod transition of the micelles, which is brought to room temperature upon addition of
NaCl. The inference about the change in the shape of the micelles has been drawn from small-angle neutron scattering (SANS)
and viscosity studies. |
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| Keywords: | Block copolymer light scattering small-angle neutron scattering PACS Nos 61 12 Ex 83 85 Jn 82 70 Uv |
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