V. M. Vdovin

Bio: V. M. Vdovin is an academic researcher from Russian Academy of Sciences. The author has contributed to research in topics: Organosilicon & Metathesis. The author has an hindex of 4, co-authored 95 publications receiving 100 citations.

Transformations of 1-vinylcyclobutene

Abstract: 1. The thermolysis of 1-vinylcyclobutene at 335°C under flash conditions gave a quantitative yield of 3-methylene-l,4-pentadiene. 2. The anionic polymerization of 1-vinylcyclobutene proceeds with retention of the fourmembered ring.

Investigation of the mechanism of polypentenamer degradation in the presence of metathesis catalysts

Abstract: A MWD method has been used to investigate the mechanism of degradative cyclization of unsaturated polymers in the presence of the catalytic system taking polypentenamer as an example. It was found that the process takes place by a random chain mechanism, one fragment being stable, and the other depolymerizing down to monomer. The fact that the initial concentration of the catalytic system appears to have no influence on the degradation points to slow initiation in this system. The ratio of the constant for chain transfer to polymer to that of depolymerization was found by experiment to be k tr / k d = 5×10 −6 m 3 /mole.

Dendralenes branch out: cross-conjugated oligoenes allow the rapid generation of molecular complexity

Abstract: Twenty-seven years ago, H. Hopf published the only previous comprehensive review on branched oligoenes that had the title "Dendralenes: A Neglected Family of Hydrocarbons". The dendralenes are no longer neglected. Research into the synthesis, properties, and applications of dendralenes is rapidly gaining momentum and this Review summarizes important recent findings. From significant fundamental properties (the first demonstration of alternating behavior since the annulenes) through to unparalleled complexity-generating synthetic transformations, this fundamental oligoene family is coming of age. Effective synthetic approaches to cyclic and acyclic dendralene systems are analyzed and classified. The most powerful synthetic transformations of the dendralenes, diene-transmissive Diels-Alder reactions, are surveyed in detail.

The Effect Of Drag Reducing Additives On Fluid Flows And Their Industrial Applications Part 2: Present Applications And Future Proposals*

Abstract: This state of-the-art review is published in two parts: Part 1 has already appeared and deals with basic aspects of the subject, while this part sets out details of specific drag reduction applications. These include oil pipelines, oil well fracturing, sewers, open channels, hydropower penstocks and culverts, the hydrotransport of pulverised solids, the effect of drag reducing additives on fluid machinery, marine applications, their use in heating systems, firefighting and jet cutting. The preparation and injection of polymer solutions, the economics of their use, their degradation in flow and the pollution implications of their release into water courses are aslo covered. Wherever possible field test results are included and discussed. The bibliography contains 154 references to published material.

Olefin metathesis-based chemically recyclable polymers enabled by fused-ring monomers.

Abstract: A promising solution to address the challenges in plastics sustainability is to replace current polymers with chemically recyclable ones that can depolymerize into their constituent monomers to enable the circular use of materials. Despite some progress, few depolymerizable polymers exhibit the desirable thermal stability and strong mechanical properties of traditional polymers. Here we report a series of chemically recyclable polymers that show excellent thermal stability (decomposition temperature >370 °C) and tunable mechanical properties. The polymers are formed through ring-opening metathesis polymerization of cyclooctene with a trans-cyclobutane installed at the 5 and 6 positions. The additional ring converts the non-depolymerizable polycyclooctene into a depolymerizable polymer by reducing the ring strain energy in the monomer (from 8.2 kcal mol-1 in unsubstituted cyclooctene to 4.9 kcal mol-1 in the fused ring). The fused-ring monomer enables a broad scope of functionalities to be incorporated, providing access to chemically recyclable elastomers and plastics that show promise as next-generation sustainable materials.