Abstract
We studied the temperature and concentration conditions of education and the field of LC – phase of existence in sulfuric acid solutions poliamidbenzimidazola. The polarization–optical methods and the structural features of biphasic and anisotropic areas and built plots the phase diagram of the concentrated solutions poliamidbenzimidazola in H2SO4. It is shown that in certain temperature – concentration of cooling modes can be observed the coexistence of three phases: isotropic crystal and a liquid crystal, which is shown as a characteristic of liquid crystal birefringent domains.
Highlights
A wide importance in mechanical engineering, especially aircraft, purchased polymer composites
It was found that at concentrations in excess of 11% solution in H2SO4 PABI transformed into anisotropic state, to forming solutions of phenylene terephthalamide (PPTA) typical lyotropic liquid crystal
By using polarization-optical methods and the structural features of biphasic and anisotropic areas and built plots the phase diagram of the concentrated solutions PABI in H2SO4
Summary
A wide importance in mechanical engineering, especially aircraft, purchased polymer composites. They are obtained on the basis of reinforcing fibers and polymer matrices [1]. The best studied of these is poly-n-phenylene terephthalamide (PPTA) [2]. Fibers of this polymer is formed from a liquid crystal (LC) solutions in concentrated sulfuric acid. Research polyheteroarylenes LC status is of great scientific and practical importance, as it allows to establish the general laws of phase transitions in polymers and to use the transition phenomenon in the mesophase to obtain highstrength fibers and films. The aim of this work was to study the temperature and concentration conditions for transition PABI H2SO4 solutions
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