✦ LIBER ✦

Compatibility of rodlike polymers

✍ Scribed by Jiaping Lin; Herong Wu; Shijin Li

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 276 KB
Volume: 30
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(94)90164-3

No coin nor oath required. For personal study only.

✦ Synopsis

The compatibility and temperature-dependent phase behaviour of the system consisting of lyotropic liquid crystalline polymer poly(p-benzamide) (PBA), poly(p-phenylene terephthalamide) (PPTA) and H2SO 4 were investigated by using the depolarized light intensity (DL1) technique and polarized light microscopy (PLM). It is shown that the DLI technique is valuable for following the phase transitions of lyotropic liquid crystalline polymer blends in solution. The results show that PBA and PPTA are not compatible in anisotropic solution, giving rise to coexisting phases over the whole range. This effect is probably due to different molecular conformations. A phase diagram for the PBA/PPTA/H2 SO4 system, divided into five regions, is constructed based on the DLI measurements and PLM observations.

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This work greatly benefited from stimulating discussions with Prof. K Burchard, Universitilt Freiburg. Financial support of the Deutsche Forschungsgemeinschaft and of the Fonds der Chemischen Industrie is gratefully acknowledged.