Standardization of e-learning in accordance with innovative standard Experience API

The article describes the advantages of an innovative standard in the field of electronic and distance learning - Experience API. Described the necessary components, that implement this standard. Also provides a brief overview of the software that supports the work of this standardВ статье раскрываются преимущества инновационного стандарта в области электронного, дистанционного обучения - Experience API. Описаны необходимые компоненты, реализующие данный стандарт. Также представлен краткий обзор программного обеспечения, поддерживающего работу данного стандарт

On solving the problem of kinetics of vulcanization with the use of numerical methods

A new approach of describing kinetics of curing was proposed. This allowed for formal adjustment of the previously proposed scheme of vulcanization, application of a mathematical model to kinetic curves of any shape and analytical evaluation of isothermal cure kinetics on the basis of economical laboratory experiments. The method of studying kinetics of vulcanization is based on the assumption that individual stages of the vulcanization process significantly differ in speed. To determine rate constants for individual stages the rheometric curve was divided into some areas. It allowed to use only a specific set of ordinary coupled reactions of the first and second order for describing vulcanization of rubbers under analysis. Software for solving direct and inverse problems of the kinetics of isothermal cure was developed

On thermo-fluctulation description of chemical reactions in polymers

Investigations of polydienes with various chemical structures and microstructures were carried out, and interrelations of molecular-structural characteristics of polydienes with their macroscopic properties in thermo-oxidation processes were shown. An experimental-formal approach to substantiation of cross-linking and destruction depth of carbon-chain linear polydiene macromolecules is proposed. The extrapolation value of the molecular weight of the chain ensuring activation of chemical reactions of vulcanization and oxidation was obtained. It is proposed to use the criterion of destruction for calculating the number of chain splinters resulting from macromolecule ruptures

Infuence of processing conditions of polymethyl methacrylate on the optical and mechanical propeties of products

Study of the mechanical and optical properties of PMMA, including the addition of recycled materials, have been conducted. the possibility of using recycled materials in the manufacture of products made of PMMA was shown. Found that the optical properties deteriorate with the introduction of secondary PMMA over 10%

Development of mathematical model of curing two-phase polymeric systems

During research of kinetics of curing of two-phase elastomeric composites the new kinetic model, allowed to explain heterogeneity of the grid which was formed in this process of curing crosslink was developed. In numerical experiments it is shown that average extent of sewing together of all system increases more slowly, than when curing in lack of diffusion of vulcanizing substances, and the speed of curing and the general extent of sewing together of a composite as a whole decreases

Simulation of polidiene oxidation kinetics

Synthetic isoprene rubber (SIR) is similar in structure and to the properties of natural rubber (NR). Currently, it can almost completely replace NR in the production of automobile tires and rubber products. An urgent task is to study the aging processes of polymers and their products, assess the impact of various factors on the oxidative stability of polymers and the selection of effective ways to protect polymers from aging. We simulated aging of inhibited (commodity) and reprecipitation (purified) polyisoprene