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INVERSE MELTING TRANSITION AND EVIDENCE OF 3-DIMENSIONAL CUBATIC STRUCTURE IN A BLOCK-COPOLYMER MICELLAR SYSTEM

K. Mortensen ; W. Brown ; Bengt Nordén (Institutionen för fysikalisk kemi)
Physical Review Letters (0031-9007). Vol. 68 (1992), 15, p. 2340-2343.
[Artikel, refereegranskad vetenskaplig]

Structural studies on aqueous solutions of PEO-PPO-PEO block copolymers show three phases as the temperature is varied. At low T, the tri-block units are dissolved Gaussian chains. As T is increased still more unimers aggregate in micelles, until a volume fraction of 0.52 is reached. The micelles then crystallize in a body-centered-cubic lattice. Upon the application of a small shear, the high-T polycrystalline phase abruptly transforms into a single crystal, characterized by only quasi-long-range order in bond length, but true long-range correlations in the bond angle.

Nyckelord: neutron-scattering, aqueous-solution, behavior



Denna post skapades 2011-08-22.
CPL Pubid: 144656

 

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Institutioner (Chalmers)

Institutionen för fysikalisk kemi (1900-2003)

Ämnesområden

Fysik

Chalmers infrastruktur