Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Polish Journal of Chemistry

1 2002

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Cellulose Derivatives : Organic Crystals and Liquid Crystals : Used the Longest, Known the Least

Kryszewski M., Wojciechowski P., Okrasa L., Kozanecki M., Ulański J.

Polish Journal of Chemistry

2002

Vol. 76 / nr 2-3

187-200

The basic characteristic of cellulose chemical constitution and its crystalline structure are presented. The LC-phases of cellulose derivatives were investigated by a series of techniques, which made possible to establish the specificity of chiral nematic mesomorphic structure and its transitions in correlation with intermolecular interactions of the side chains. The anisotropic composites, formed by stabilization of mesomorphic phase of LC-cellulose derivatives by photopolymerization of lyotropic solvent (acrylic acid), are characterized by thermooptical analysis, dielectric spectroscopy, dynamic mechanical measurements, WAXS and Raman spectroscopy. These techniques show that the structure of the vinyl polymer within the composite is dependent on the oriented mesophase. The vinyl polymer phase in the glassy state counteracts the relaxation of LC-cellulose derivatives leading to its stabilization and reorientation in the heating and cooling cycles. These properties suggest such composites as materials of interesting from both fundamental and practical points of view.