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Sanidic liquid crystallinity

The substituted polyamides with long alkyl- and alkoxychains [33] are highly soluble and form anisotropic melts above their melting temperature. These polyamides are typical examples of sanidic liquid crystalline polymers. Generally, no lyotropic behavior is observed. The temperature stability is obviously substantially lowered due to the substitution with alkyl chains. [Pg.23]

In recent years, rigid-rod polymers with regularly substituted flexible side branches have drawn a lot of attention, since they exhibit both high thermal resistance and excellent solubility. In addition, these polymers, if properly designed, can become even fusible. In structure, most of them are crystalline" and form sanidic liquid crystallinity, even though they are strongly branched. This new crystal stmcture is called layered crystal structure. ... [Pg.477]

Investigations by means of DSC and polarisation microscopy as well as temperature dependent MAXS- and WAXS-measure-ments resulted in the existence of sanidic liquid crystallinity from pentamer upwards. [Pg.303]

Fairly rigid main chain liquid crystalline polymers with disc-shaped units in the chain have been reported to form a sanidic (board-like) nematic phase, with a parallel alignment of the boards [367]. [Pg.703]

It is perhaps appropriate to mention here that both nematic liquid crystalline side chain polymers with laterally attached mes-ogenic groups [16] and sanidic aromatic polyamides [17] have been shown to exhibit Nb phases. [Pg.1947]


See other pages where Sanidic liquid crystallinity is mentioned: [Pg.2787]    [Pg.388]   
See also in sourсe #XX -- [ Pg.477 ]




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