Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Dynamic behaviour of nematic polymers in a magnetic field

Filippov A. P.

Opto-Electronics Review

2002

Vol. 10, No. 1

63-68

Dynamic properties of some polymer nematics were investigated by Freedericksz transition methods in a magnetic field. The linear aromatic polyester, comblike combined side/chain-main/chain polymer and comblike copolymers with mesogenic and functional acid groups in side chains were studied. The temperature dependences of the effective rotation viscosity γ₁* were obtained. At close molecular weight and temperature the γ₁* value for linear polymer exceeds that for comblike combined polymer. Therefore, the existence of side mesogenic groups decreases the velocity of the orientational processes of polymer nematic. However, the highest values of effective rotation viscosity were obtained for the nematic phase of the comblike functionalized copolymers. Hence, the formation of hydrogen bonds in these copolymer leads to slowing of orientational processes. Influence of the intermolecular hydrogen bonds on dynamic properties of functionalized copolymers is stronger than that of intramolecular hydrogen bonds.