Download Mechanical and Thermophysical Properties of Polymer Liquid by Richard G. Weiss (auth.), Witold Brostow (eds.) PDF

By Richard G. Weiss (auth.), Witold Brostow (eds.)

may by no means conquer the results of hysteresis and pressure (see Chapters 6 and 12). the 1st sentence of the reference paintings, guide of Liquid Crystals, reads: The phrases liquid crystals, crystalline liquid, mesophase, and mesomorphous nation are used synonymously to explain a kingdom of aggregation that indicates a molecular order in a dimension variety just like that of a crystal yet acts roughly as a viscous liquid: [2] In different phrases, molecules inside a liquid crystalline part own a few orientational order and absence positional order; additionally, the form of a liquid crystalline pattern depends on the vessel during which it really is contained instead of by way of the orientational order of its aggregated molecules. The authors famous the restrictions and imprecision of this definition yet, like others previous them, couldn't devise an easy and usually appropriate person who is healthier. Regardless, the phrases 'liquid crystal' and 'mesophase' shouldn't be used interchangeably. As pointed out above, all liquid crystals are mesophases, yet all mesophases will not be liquid crystals. fresh reports, utilizing problematic and complicated analytical recommendations, have authorised finer differences among classical crystals and mesophases. whilst, they've got made definitions like that from the guide of Liquid Crystals a bit of out of date for purposes except terminology. One a part of the matter arises from using a mixture of bulk houses (like circulate) and microscopic houses (like molecular ordering) in the related definition.

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And Shearer, G. (1925) ]. Chem. , 127, 591. 46. , Mitcham, D. L. (1970) Chem. Eng. Data, 15,542. 47. , Chandrasekhar, S. M. (1993) Collect. Czech. Chem. , 58, 142. 48. L. G. (1987) Tetrahedron, 43, 1371. 49. E. (1973) ]. Polym. Sci. , 11, 3043. 50. N. (1975) Organic Molecular Structure, Willard Grant Press, Boston, Ch. 18. 51. S. (1957) J. Chem. , 26, 604. 52. S. and Shashidhar, R. (1969) Mol. Cryst. Liq. , 8, 339. 53. S. and Krishnamurti, D. (1970) Mol. Cryst. Liq. , 6,407. 54. Baldvins, J. (1996) PhD Thesis, Georgetown University, Washington, DC 55.

The processes leading to a mesophase involve decreases in both the elemental weight fraction of hydrogen and the group fraction of aliphatic carbon atoms [164]. studies have demonstrated that the component molecules of these phases are fused, polycyclic aromatic molecules with disk-like shapes; the exact structures of the components depend upon the natures of the precursor molecules which are heated [164 -167]. All of the carbonaceous mesophases somewhat resemble discotic nematic phases [168]. At least some of them probably represent another example of liqUid crystallinity induced by mixing molecular components which, when separated, are not mesogenic.

M. (1990) Mol. Cryst. Liq. , 182B, 201. 113. M. and Lillya, CP. (1991) ]. Org. , 56,6064. 114. , Yamamura, K. and Okada, Y. (1987) ]. Org. , 52, 2502. 115. , Psaras, P. and Kohne, B. (1991) Chem. , 124, 2523. 116. Praefcke, K. and Blunk, D. (1993) Liq. , 14, 1181. 117. , Blunk, D. and Hempel, J. (1994) Mol. Cryst. Liq. , 243, 323. 118. , Psaras, P. and Hampel, J. (1991) ]. Carbohydr. , 10, 539. 119. , Kohne, B. et a!. (1991) Mol. Cryst. Liq. , 203,149. 120. , Kohne, B. et al. (1991) Liq. , 9, 711.

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