| Ginzburg number of a homopolymer/diblock copolymer mixture covering 3d-Ising, isotropic Lifshitz and Brasovskii class of critical universality (2005) | |||||||||||
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| PRL PHYSICAL REVIEW LETTERS week ending MARCH Ginzburg Number Homopolymer Diblock Copolymer Mixture Covering the Ising Isotropic Lifshitz and Brasovski Classes Critical Universality Vitaliy Pipich Dietmar Schwahn and Lutz Willner Forschungszentrum Julich GmbH Institut fur Festkorperforschung Julich Germany Received August published March The Ginzburg number deuterated poly butadiene dPB and poly styrene homopolymer blend critical composition mixed with dPB symmetric diblock copolymer was determined from small angle neutron scattering orders magnitude change was determined between binary polymer blend and diblock copolymer melt The strongest change observed within the isotropic Lifshitz regime critical universality occurring over range diblock concentration and interpolates the corresponding the Ising and Brasovski regimes Lifshitz critical point was not observed consistent with the proposed lower critical dimension dLCP DOI PhysRevLett PACS numbers Ex Fr The Ginzburg number TC ned reduced temperature which determines the range strong thermal uctuations around the critical point critical temperature where nonlinear effects lead class critical universality different from mean eld present here three component polymer melt binary homopolymer blend critical composition and symmetric diblock copolymer which was determined small angle neutron scattering SANS experiments Such systems show complex phase diagram they bridge the Ising isotropic Lifshitz and Brasovski classes critical un | |||||||||||
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