Ordering in block copolymers

Phase ordering in block copolymers can be described by the same dynamic equation as in the case of homopolymer blends [Eqs. (53)—(55)] with the LG... 

The kinetics of ordering in block copolymer melts have been studied using cell dynamics simulations of the TDGL equation (Bahiana and Oono 1990 Chakrabarti et al. 1991 Puri and Oono 1988 Qi and Wang 1996, 1997 Shiwa et al. 1996). Here, the time evolution of the order parameter ip is followed ... 

Olszowka V, Kuntermann V, Boker A (2008) Control of orientational order in block copolymer thin films by electric fields a combinatorial approach. Macromolecules 41 5515-5518... 

This wetting picture (Fig. 12 [6]) of surface-induced ordering in block copolymer melts has been considered recently by Milner and Morse [60]. They considered the transition from the state of weak surface-induced order (Fig. 12a) to the case of strong-surface induced order (Fig. 12b) and pointed out that typically a first-order transition may occur between these states, in analogy to the "prewetting transition" first proposed by Cahn [226] (Fig. 14a). This prewetting-type first-order transition may persist in a thin film (Fig. 14b), but it ends in a triple point where the surface excess ( ) is still finite, of course, since no diver-... 

Neutron reflectivity has established the structure of polymer layers at interfaces (air-solution and solution-solid), determined the surface ordering in block copolymer films, and revealed the nature of inter-diffusion in mixed polymer films. 

In the Current State of the Art we will review some of the recent SANS and reflectivity data from ISIS, which also serve to point to future directions and opportunities. Recent reflectivity measurements, on the adsorption of polymers and polymer/surfactant mixtures at interfaces, surface ordering in block copolymer systems, time dependent inter-diffusion at polymer-polymer interfaces, and the contribution of capillary waves to interfacial widths, will be described. The use of SANS to investigate the dynamic of trans-esterification of polyester blends, the deformation of copolymers with novel morphologies, and the use of diffraction techniques to determine the structure of polymeric electrolytes, will be presented. 

Xu, T., Goldbach, J.T., Russell, T.P. Sequential, orthograial fields a path to long-range, 3-D order in block copolymer thin films. Macromolecules 36, 7296 (2003)... 

Mesomorphic Order in Block Copolymers from a-Amino Acids and Other Monomers and in Copolymers from a-Amino Acids... 

DOUY AND GALLOT Mesomotphic Order in Block Copolymers... 

DOUY AND GALLOT MesomorpMc Order in Block Copolymer... 

Ordering in block copolymer/block copolymer blends... 

Horsch MA, Zhang ZL, lacovella CR, Glotzer SC. Hydrodynamics and microphase ordering in block copolymers Are hydrodynamics required for ordered phases with periodicity in more than one dimension J Chem Phys 2004 121 11455. 

In addition, the actual interaction potentials are not explicitly considered, their effect is simply lumped into some effective interaction parameters SAAt AB and esB between the respective nearest neighbor pairs. Also the Leibler theory of mesophase ordering in block copolymers may be thought... 

Krishnamoorti R, Silva AS, Mitchell CA (2001) Effect of silicate layer anisotropy on cyMn-drictil and spherical mictodomain ordering in block copolymer nemocomposites. J Chem Phys 115 7175-7181... 

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