Results 221 to 230 of about 40,904 (265)
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Entropy-driven surface segregation in block copolymer melts
Physical Review Letters, 1993Surface segregation in thin films of symmetric polyolefin diblock copolymers containing a lamellar microstructure, cast on a variety of substrates, has been investigated. In all cases, the conformationally smaller block preferentially segregated to both the solid and air interfaces even though the surface energy of the solid substrate always exceeded ...
, Sikka +5 more
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Interface dynamics in a block copolymer melt and the effect of noise
Physical Review E, 1996The role of fluctuations in the disorder-lamellar transition in a block copolymer melt is investigated using a cell dynamical system simulation by measuring the propagation velocity of the interface between ordered and disordered regions. Our results strongly suggest that near the transition temperature, in the absence of noise, the velocity increases ...
, Komura, , Fukuda, , Paquette
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Microphase Segregation in the Melts of Bottlebrush Block Copolymers
Macromolecules, 2020We present an analytical theory of microphase separation in the melt of bottlebrush and comblike block copolymers in the strong segregation limit.
Ekaterina B. Zhulina +3 more
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Network Phases in Block Copolymer Melts
MRS Bulletin, 2005AbstractThe following article is an edited transcript based on the David Turnbull Lecture given by Frank S. Bates of the University of Minnesota on December 1, 2004, at the Materials Research Society Fall Meeting in Boston. Bates received the award for “pioneering contributions to the fundamental understanding of structure and properties of complex ...
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Flexible/Branched Block Copolymer Melts
Macromolecules, 2002I determined the phase boundaries for regularly branched block copolymers in the self-consistent classical path, circular/spherical unit cell approximation. In contrast to the case for linear chains, end-free “dead” zones are highly suppressed for highly branched molecules, greatly simplifying the integral equations to be solved.
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Gaussian- to stretched-coil transition in block copolymer melts
Physical Review Letters, 1990Two scaling regimes, D\ensuremath{\sim}${\mathit{N}}^{\mathrm{\ensuremath{\delta}}}$ with \ensuremath{\delta}=0.49\ifmmode\pm\else\textpm\fi{}0.02 and 0.80\ifmmode\pm\else\textpm\fi{}0.04, have been identified in a model set of nearly symmetric diblock copolymer melts, where D and N are the system peridocity and degree of polymerization, respectively ...
, Almdal +4 more
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Smectic Ordering in Block-Copolymer Melts
Molecular Crystals and Liquid Crystals, 1991Abstract Microscopic theory of smectic ordering in melts of rod-coil copolymers is proposed. It is shown that a second-order phase transition nematic-smectic A or a first-order transition nematic-smectic C may occur in the system as Flory's parameter of incompatibility of the blocks, x is increased.
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Formation of multicontinuous structures in block copolymer melts
Progress in Colloid & Polymer Science, 1997Using a new lattice polymer simulation method for block copolymers, we have studied a dense polymer system composed of monodisperse linear A-B-C triblock copolymers. We confirm that a tricontinuous structure for linear A-B-C block copolymers observed by Mogi et al. (Macromolecule 25, 5408 (1992) and ibid.
T. Dotera, A. Hatano
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Rheology of Phase Separated Block Copolymer Melts
MRS Proceedings, 1989Flow can transfer the microphase separated morphology of block copolymers into a state of global order. For tri-block copolymers with cylindrical domains, this has been demonstrated by Folkes et al. (1973) and Hadziioannou et al. (1979). who established the existence of ‘single crystals’ of hexagonally ordered cylinders with uniform director throughout
H. Henning Winter, Faith A. Morrison
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A Network Model for Melt Rheology of Block Copolymers
Journal of Rheology, 1984A kinetic network model is developed for the viscoelastic behavior of block copolymer melts with spherical microdomains. This model accounts for the variation in density of the matrix polymer segments from the domain boundary to the outer interphase boundary, with a non‐Gaussian segment distribution involving one new parameter.
Ekong A. Ekong, Krishnamurthy Jayaraman
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