<title>Interfacial effects in nematic liquid crystals</title>

Abstract

Long-time isothermal currents in liquid crystals are in test. It is shown, that in nematic as well as isotropic pentacyanobiphenyl I 5CB/ quasi DC conductivity is observed for elevated time of measurements. The investigation of these current are presented. It is suggested that these current may originate from carrier exchange between solute molecules and electrode due to strong interface field.

Kinetic Monte Carlo Studies on the Importance of the Reaction Scheme in Segmental Exchange of Copolymer Chains

“…This parameter was further, although most often in other forms, called incorrectly by many authors as the degree of randomness (DR). There are two most frequently used forms: one valid for copolymer chains of any $\overline {DP} _{{\rm n}} $ , in the form of the sum of probabilities of following units A and B in a dyad by a unit of the other type (Equation 19)17 where P (XY) = x XY /( x XY + x XX ); x means a mole fraction of the corresponding dyad; X, Y = A, B; X ≠ Y and the other, relating DR with the average lengths of segments A and B (Equation 20): where 〈 L A 〉 and 〈 L B 〉 are the number‐average lengths of blocks A and B, respectively.…”

“…In every reaction time interval each active center was picked sequentially and the probabilities of all reactions involving this active center were being computed. A randomly selected transformation of the reacting chain was realized with a monomeric unit randomly selected from appropriate population, provided the computed random life‐times of reacting species were shorter than the remaining time to the end of the assumed time interval 7, 17…”

On Narrowing Chain-length Distributions in Ideally Dispersed Polymerization Systems

“…The Gillespie's method of computations of polymerization was applied . However, as the only reactions simulated were additions of monomer molecules to growing chains (chain polymerization), or fusion of two chains (step processes) with equal probabilities of reactions of all randomly chosen pairs of reacting species, then time scale of polymerization was not analyzed and no computation of reaction times between consecutive reaction acts were carried out.…”

Comparative Kinetic Monte Carlo study of the Sulfinyl and Dithiocarbamate Precursor Route toward Highly Regioregular MDMO‐PPV

“…Recently, Van Steenberge et al developed17 a kinetic Monte Carlo (kMC) model for PPV homopolymerization via the sulfinyl precursor route and a (terminal) kMC model for copolymerization 18. These models are related to the models developed by Szymanski19 for living polymerization and by Wang and Broadbelt20 for nitroxide mediated polymerization. In the present work, the (terminal) copolymerization model is extended with the calculation of the triad distribution for MDMO‐PPV as obtained by both the sulfinyl and DTC precursor route.…”