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A series of novel mesogenic polyamides containing a flexible pendent side group wassynthesized by solution condensation polymerization. The new monomers, diacids and di-amines containing flexible elements of diferent lengths, were also synthesized and character-ized by ~1HNMR, mass spectroscopy and elemental analysis. The polymers were character-ized by viscosity measurements, differential scanning calorimetry (DSC), X-ray diffiactionand polarizing optical microscopy These studies revealed that polyamides containingflexible elements of a sufficient length exhibited thermotropic liquid crystalline(LC) pro-perties. The melting temperatures of this series of polymers were particularly sensitive tothe length of the flexible segment on the main chain and that of the flexible pendent esterside chain. Lyotropic LC behaviours were also observed in solution. 相似文献
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本文概述了PowerPoint、MathCAD、MATLAB和3DSMAX软件的各自特点及它们在高等教学电子教案制作中的分工协作方法。 相似文献
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MathCAD软件在高等数学教学中的应用 总被引:2,自引:0,他引:2
本介绍了MathCAD的直观灵活的操作特点,通过实践和实例说明了它在高等数学课堂CAI教学中较之其它数学软件所特有的优势。 相似文献
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用MATLAB解决高等数学中的图形问题 总被引:13,自引:0,他引:13
本文通过实例将 MATLAB与 Mathematica的图形功能做了比较 ,指出了 MATLAB在解决高等数学图形问题时的优势 . 相似文献
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