Scientific fundamentals of organization of geological prospecting on basis of sectoral system of technoscientific information under conditions of new economic mechanism

Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

THE DEVELOPMENT OF THE TECHNOLOGICAL BASES FOR OBTAINING AND PROCESSING OF THE BASE THERMOPLASTIC BUTADIEN-NITRIL ELASTOMERS

The object of investigation: the butadien-nitril rubber, polyvinylchloride, polystirol, polycarbonate, ABC-plastics, polyamide, acetylcellulose, polypropylene. The theoretical justification has been given, the mathematical model of the quality of the base materials, the mathematical model of optimization of the modified thermoplastic elastomers recipe have been developed, the influence of the fillers and plastificators of the different nature on the consumers properties of the base materials has been developed, the method of prognosing of the materials technological properties has been developed. Offered has been the method of the "dynamic" vulcanization, with the aid of which the base materials have been received, and it allows to reduce the time of the vulcanization by 5 times and to reduce the electric power consumption. The recipes of the cast compositions, posessing the improved values of the operating and consumer properties, the modes and the parameters of the processing of the base materials, the multiple use of the obtained alloys have been offered. The base polymer materials of the new type for casting under pressure have been introduced in practiceAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

The Good Host: Formation of Discrete One-Dimensional Fullerene “Channels” in Well-Ordered Poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2‑<i>b</i>]thiophene) Oligomers

Due to the unique crystallinity of poly­(2,5-bis­(3-alkylthiophen-2-yl)­thieno­[3,2-<i>b</i>]­thiophene) (PBTTT), it is an excellent model polymer to study the structure–property relationship in organic devices, especially those relying on junctions of electron- and hole-transporting materials. Here, we report the synthesis and characterization of a series of monodisperse PBTTT oligothiophenes (<i>n</i> = 1–5) and systematically examine the evolution of crystalline behavior, morphology, and interaction with [6,6]-phenyl C₆₁-butyric acid methyl ester (PCBM) as the molecular conjugation length increases. We discovered that fullerene intercalation occurs when there is enough free volume between the side chains to accommodate the fullerene molecule. The intercalation of PCBM is observed beyond BTTT-2 and longer oligomers, likely similar to that of PBTTT. Interestingly, both experiments and molecular simulations show that PCBM intercalation also appears to “catalyze” a more efficient packing of the BTTT-2 dimers. Crystal structure analysis revealed that the straight BTTT-2 side chains form one-dimensional (1D) channels that could perfectly host PCBM but, in the pure material, accommodate the interdigitated side chains from adjacent layers. In the blend with PCBM, these channels are maintained and enable the cocrystallization and intercalation of PCBM. This is the first time the actual sublattice cell of PCBM has been determined from the X-ray data, and demonstration the utility of the oligomers as model systems for their polymer counterparts. Among the organic photovoltaic devices (OPVs) made from the BTTT oligomers and [6,6]-phenyl C₇₁-butyric acid methyl ester (PC₇₁BM) blends, the ones containing the BTTT-2 dimer exhibit the highest performance