| Composition fluctuations in a homopolymer-diblock copolymer mixture covering the three-dimensional Ising, isotropic Lifshitz, and Brasovskii classes of critical universality (2005) | |||||||||||
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| THE JOURNAL CHEMICAL PHYSICS Composition uctuations homopolymer diblock copolymer mixture covering the three dimensional Ising isotropic Lifshitz and Brasovski classes critical universality Vitaliy Pipich Dietmar Schwahn and Lutz Willner Forschungszentrum lich GmbH Institut Festk rperforschung lich Germany Received June accepted June published online September The phase behavior three component polymer blend consisting critical mixture polybutadiene and polystyrene with varying amount symmetric diblock copolymer was explored with small angle neutron scattering Our focus were thermal composition uctuations which discuss terms mean eld three dimensional Ising isotropic Lifshitz and Brasovski classes critical universality Particular attention spent the observation narrow reentrant two phase regime and double critical point the Lifshitz critical regime well the Lifshitz line Critical exponents the isotropic Lifshitz case are proposed spite the demonstrated nonexistence the isotropic Lifshitz critical point The Ginzburg number and Flory Huggins parameter were determined over the whole diblock concentration range changes three orders magnitude two orders magnitude that change over diblock concentration interval within the isotropic Lifshitz regime American Institute Physics DOI INTRODUCTION Three component polymer mixtures consisting symmetric binary polymer blend critical composition and symmetric diblock copolymer and symbolize the polymer components allow the exploration the thr | |||||||||||
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