Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: DSC calorimetry

Sortuj według:

Ogranicz wyniki do:

Liquid-crystalline properties of 4-alkyl-, 4-alkyloxy and 4-halogene-4'-hydroxyazobenzene alkyloates

Trzaska J., Galewski Z.

Opto-Electronics Review

2009

Vol. 17, No. 2

129-139

Twenty one esters, 4-alkyl-, 4-alkyloxy-, 4-nitro- and 4-halogene-4'-hydroxyazobenzne alkyloates have been synthesised. Basing on the DSC calorimetry and polarizing microscopy liquid- crystalline polymorphism was investigated. Five types of mesophases were identified: nematic, smectics A, C, F and unknown X (probably G).

Liquid Crystalline Properties of 4-Methyl-, 4-Ethyl- and 4-Propyl-4'-alkyloxyazobenzenes

Zienkiewicz J., Galewski Z.

Polish Journal of Chemistry

2002

Vol. 76 / nr 2-3

359-366

Liquid crystalline properties of 4-methyl-4_-alkoxyazobenzenes (azo-1-n), 4-ethyl-4_- alkoxyazobenzenes (azo-2-n) and 4-propyl-4_-alkoxyazobenzenes (azo-3-n) are described. For these three homologous series, temperatures and enthalpies of phase transitions and the types of mesophases are presented. The influence of the alkoxy chain length on the sequence of mesophases, temperatures of the phase transitions and the entropy effects are discussed.