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By R. S. Jones, J. E. Kuder (auth.), K. L. Mittal (eds.)
This quantity records the lawsuits of the Symposium on Polymers in details garage know-how held as part of the yankee Chemical Society assembly in l. a., September 25-30, 1988. it's going to be recorded right here that this symposium used to be cosponsored by way of the department of Polymeric fabrics: technology and Engineering, and the department of Polymer Chemistry. Polymers are used for a number of reasons in either optical and magnetic info garage applied sciences. for instance, polymers locate purposes as substrate, for storing details without delay, as protecting coating, as lubricant, and as binder in magnetic media. within the previous couple of years there was a excessive pace of analysis job facing the various ramifications of polymers within the interesting area of data garage. Concomitantly, we made up our minds to arrange this symposium and that i think this was once the ultimate occasion in this subject. This symposium used to be conceived and arranged with the subsequent pursuits in brain: (1) to compile these actively concerned (polymer chemists, polymer physicists, photochemists, floor and colloid chemists, tribo10gists and so forth) within the a number of features of this subject; (2) to supply a discussion board for dialogue of contemporary R&D task during this know-how; (3) to supply a chance for cross-pollination of principles; and (4) to spot and spotlight parts, in the huge purview of this subject, which wanted intensified or speeded up R&D efforts.
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Extra info for Polymers in Information Storage Technology
Example text
0 ~m, it appears that phase ripening is important in determining the phase domain sizes in the experimental system under study. 27 Figure 5. 001 s, 150 ohm). 2°. The sample was 8 microns of 50% by weight blend of high molecular weight PMMA and EBBA. Figure 6. 01 s. 1°. The importance of phase ripening in determining ~~aI~ ~gmain size has been established in several studies of polymer blends ' , . As we shall see later, the experiments conducted here are done on active layers coated over glass, thus cooling rates are restricted.
An understanding of ternary (and binary as a special case) phase equilibria is, therefore, important in selecting materials. A computer algorithm is presented to predict the phase diagram of solvent/liquid crystal/polymer mixtures. The thermodynamic calculations are based on the Flory lattice model, which is modified with terms to account for enthalpic effects. This computer algorithm was used in combination with cloud point experiments to study the effect of temperature on liquid crystal molecule-polymer interaction.
X3 = 20. Figure 17 illustrates effects on the phase behavior when the polymer interaction parameters (X 12 and X23 ) change. Again, increased rigid rod repulsion again results In a greater tendency for phase transition. Figure IS shows experimental data on the phase transition temperatures of ternary mixtures of toluene, EBBA, and polystyrene. Boundaries are plotted of homogeneous and two-phase regions experimentally observed at different temperatures. The samples were tested in a small, closed container with a hot stage microscope.