Dipole relaxation, intramolecular mobility, and molecular self-organization in solutions of alternating polymers with phenylazomethine and siloxane fragments

Dielectric relaxation in solutions of polyesters containing flexible siloxane and rigid phenylazomethine fragments of various structures is studied. For these polymers in solution, five relaxation processes that reflect the mobility of certain portions of the macrochain are observed. The kinetic rigidity of the macrochain increases with increasing length of the siloxane spacer. This trend is associated with rearrangement of the electronic structure of silicon atoms and phenyl rings and with ordering of rigid phenylazomethine fragments.     

Generalization of a theorem of Fleck,Hedetniemi and Oehmke on δ1-semigroups of automata

A solution to a conjecture of Fleck, Hedetniemi and Oehmke [4] on $\text{δ}{}^1\text{-}\text{semigroups}$ of automata is presented. This also generalizes a result in [1].     

A study of the orientational drawing of monofilament Lavsan

A comparative study of two variants of the orientational drawing method for Lavsan monofilament is presented, i. e., the usual method of drawing in hot water, which depends on the difference in angular velocity of two rotating discs, and the traction method, in which the filament is drawn through the nozzle of a spinneret. The effect of drawing temperature on the physico-mechanical and structural properties of Lavsan monofilament studied, and possible differences in drawing mechanism between the two methods are considered.Mekhanika Polimerov, Vol. 1, No. 6, pp. 146–151, 1965     

Structural features of the photogeneration mechanism of free charge carriers in element-containing polydisalicylidene azomethine series

Photophysical properties of new polytetra- and polydisalicylidene azomethines (PSAMs) with chains containing Si, Ge, Sn, or transition metal atoms and atoms of a number of other divalent metals are studied. Based on data on ultraviolet and infrared spectra, it was found that the noncovalent transannular donor-acceptor interaction N M (M is semimetal or metal) occurs in polymers, which leads to the formation of a polymer chain of six-membered cycles. As a result, polyconjugations arise in PSAMs by a “non-classical” mechanism. Due to multiple donor-acceptor interactions of unshared electron pairs of azomethine groups with vacant d-orbitals in metals, polymers feature conductive, photosensitive, and photoconductive properties. The photosensitivity and quantum yield of photogeneration of free charge carriers for PSAMs are close to the values characteristic of classical conducting polymers. It was shown that the PSAM properties are controlled by the azomethine fragment structure and acceptor properties of metal. A mechanism of free carrier photogeneration was suggested.