Deuteron Magnetic Resonance Study of Order and Dynamics in Liquid Crystal Polymers

1984

Abstract Thermotropic nematic polyesters, specifically deuterated at different positions of the polymer chain are studied by multiple pulse dynamic NMR. Analysis of the NMR experiments is achieved, employing a comprehensive model, based on the stochastic Liouville equation. Computer simulations provide the orientational distributions and conformations of the polymer chains and the correlation times of the various motions. In the anisotropic melt the correlation times for chain reorientation and trans-gauche-isomerization are in the range of 0.1–10 ns. Decreasing the temperature of the solid polymer first freezes the intermolecular motions. Thus, below the glass transition only intramolecula…

Deuteron NMR Relaxation Studies of Combined Main-Chain/Side-Chain Polymers in the Liquid Crystalline and Glassy State

1989

Etude du polymere [O−Ph−CO 2 −Ph(R)−O−CO−Ph−O-(CH 2 ) 10 −] n (R=(CH 2 ) 6 −O−Ph−N=N−Ph−OMe) qui est caracterise par des parametres d'ordre des mesogenes de la chaine principale tres superieurs a ceux des chaines laterales. On observe une biaxialite moleculaire dans toutes les mesophases et dans la phase smectique A

1982