Abstract
AbstractThe structure factor of a poly(ethylene‐propylene)poly(dimethylsiloxane) diblock copolymer has been measured by SANS as a function of temperature and pressure. In contradiction to the random phase approximation the conformational compressibility exhibits a pronounced maximum at the order‐disorder phase transition. The phase boundary shows an unusual shape: with increasing pressure it first decreases and then increases. Its origin is an increase in, respectively, the entropic and the enthalpic part of the Flory‐Huggins interaction parameter. The Ginzburg parameter describing the limit of the mean‐field approximation is not influenced by pressure.
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