No 1 (2025)
High-Molecular Compounds
Regularities of formation of structure and composition of isoprene rubbers and rubber formulations for full-fledged replacements of natural rubber in tires and rubber goods
Abstract
The differences between NR's and Synthetic Polyisoprene's (IR) were analyzed to suggest the reasonable ways of NR's change to IR for production in the Russian Federation Tires and Rubber Goods without logistic problems. Critically are considered the tries of artificially creating of NR as "island nano-matrix" colloid structures of Tanaka (TSt's) et.al by grafting of styrene and another monomers (Kawahara, S et al., 2022) or including Phospholipides or Aminoacides into macromolecules (Chinese patents, 2023, 2024). The explanation of the reasons of high "Green Strength" (GS) of NR Rubber Compounds (RC's) due to the presence of the TSt's, and also the only technologically possible way of the solving of the problem is suggested. This way includes the addition into the RC's at the first stage of mixing in close mixer so called NFA-modifier, of LLC "Chemical R&D" company, based on 4-nitrosodiphenylamine
3-16
Technology and Processing of Polymers and Composites
Synthesis and properties of chlorinated high-carboxylated latexes
Abstract
The research is devoted to the development of new aqueous dispersions based on vinylidene chloride copolymers (VDC), which can become an alternative to imported polychloroprene latexes. The process of preparation of chlorinated latexes by emulsion inoculum copolymerization of VDX with other monomers is described, which allows to create materials with different properties. Special attention is paid to the study of properties of vinylidene chloride-containing latex used as an inoculum for further synthesis stages. The results of analysis of copolymer composition depending on monomer conversion and data on changes in colloidal characteristics of latexes at different degree of neutralization of carboxyl groups are presented. Butadiene-nitrile and isoprene-nitrile vinylidene chloride-containing heteropolymer latexes were prepared in the presence of inoculum latex particles. The results obtained show that the proposed approach is promising for the creation of domestic materials capable of competing with foreign analogs.
17-21
Theoretical foundations and capabilities of the equilibrium thermomechanical analysis method for quantitative assessment of the structure and properties of cross-linked elastomers
Abstract
Theoretical and experimental results are presented, on the basis of which it is concluded that the structure of cross-linked elastomers is, for thermodynamic reasons, sets of tangles-globules consisting of chain segments of the same lengths. The deformation of such a system proceeds unaffinically by successive destruction of structural elements with increasingly high elastic modules determined by the growing molecular weights of the chains that make up the structural elements. The above method of "Equilibrium Thermomechanical Analysis" (ETMA) for cross-linked elastomers confirms the existence of the above structures and allows quantifying a number of physicochemical and operational properties that are not determined by other methods depending on the compositions (formulations) of elastomers and their stress-strain equilibrium states.
22-29
Properties of elastomeric compositions based on synthetic polyisoprenes using lactam-containing complex compounds
Abstract
In accordance with the recommendations of the Russian government on scientific developments capable of replacing natural polyisoprene - NK with synthetic ones - SKI-3, SKI-5, the authors tested their lactam-containing complex compounds in elastomeric compositions based on NK, SKI-3 and SKI-5. The results obtained indicate the possibility of solving the problem, in particular, when using SKI-5.
30-36
Scientific Heritage
37-44