Electrochemical Properties and Absorption Spectra of Conducting Films of Tetrathyotetracene Iodids

Films of tetrathyotetracene (TTT) iodides were obtained by doping of evaporated TTT films with iodine from I-containing solutions. TTT was evaporated onto a conducting substrate which then was used as an anode in KI solution. As a result of electrochemical reaction, iodine penetrated into the TTT film forming conducting TTT iodides. Cyclic voltamogrammes and absorption spectra show at least two stable forms of TTT-I$\text{}_{x}$, differing by iodine contents

ELECTROCHEMICAL PROPERTIES AND ABSORPTION SPECTRA OF CONDUCTING FILMS OF TETRATHYOTETRACENE IODIDS

Films of tetrathyotetracene (TTT) iodides were obtained by doping of evaporated TTT films with iodine from I-containing solutions. TTT was evaporated onto a conducting substrate which then was used as an anode in KI solution. As a result of electrochemical reaction, iodine penetrated into the TTT film forming conducting TTT iodides. Cyclic voltamogrammes and absorption spectra show at least two stable forms of TTT-I x , differing by iodine contents

Stabilization of shapes and dimensions of compressed wood using chemical and physical methods

Descriptions of methods and results of experiments on the preservation of geometry and dimensional parameters of compressed wood using chemical and physical methods are given. Wide ranges of substances were used as chemical stabilizers in urea aqueous solution (plasticizer during pressing). Wood treatment with ultrasound, liquid nitrogen and pulsed magnetic field was used as physical methods. Urotropine, urea-formaldehyde oligomer, phenol-formaldehyde resin, butyric anhydride and physical methods (liquid nitrogen and pulsed magnetic field), as well as ultrasound can be applied to increase form stability of pressed wood to the level of swelling in water and water absorption of natural wood (respectively, 15-20% and 30-45%). Cashew nut shell liquid is recommended to obtain stable pressed wood. The liquid, with a content of 6-12% (by dry residue) relative to the mass of dry wood during heat treatment in the temperature range of 150-155°C for 8 hours, gives limiting volume swelling 7-8% and limiting water absorption 14-18%. Fully stable compressed wood was obtained after exhaustive acetylation with acetic anhydride and subsequent maximum impregnation with phenol alcohols (more than 70% of content) and thermocatalytic curing. However, this method cannot be recommended due to high toxicity and material weakness