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- W2034613114 abstract "Comb polymers with semi-flexible main chains and rod-like nematogenic side chains form interesting nematic phases, largely as a consequence of competition between polymer entropy and rod order. The authors model this competition taking main chains of various stiffness and side groups of various length. Depending on volume fractions, temperature, nematic coupling and stiffness they get one of three nematic phases which they call NI, NII or NIII. They find that at least one component, main or side chain, must be ordered toward a direction, i.e. have a positive order parameter, and the order parameter can be positive or negative. They identify the molecular trends leading to each possibility. The theory, in addition to complex phase diagrams, also predicts unusual properties such as anomalous temperature variation of optical anisotropy and molecular conformational changes. The latter, amenable to small angle neutron scattering, shows a prolate (rod-like) form for the main chain dimension in the NII and NIII phases where the main chain order parameter is positive. The oblate (disk-like) form, the NI phase, is examined in some detail." @default.
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- W2034613114 date "1987-02-21" @default.
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- W2034613114 title "Theory of nematic comb-like polymers" @default.
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- W2034613114 doi "https://doi.org/10.1088/0305-4470/20/3/033" @default.
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