T. R. Deberdeev

Description of the deformation properties of cross-linked polymers in the framework of the linear theory of heredity using a new formalization of the instantaneous component

67 Compliance is one of the main properties of highly cross linked polymer matrices taken into account in choosing such matrices for high strength fiberglass ware [1]. Because the instantaneous component of compliance in the existing models is unrelated to a certain relaxation state of highly cross linked poly mers [1], the purpose of this work was to formalize the compliance in all their relaxation states with clear physical meaning.

Using vortex layer devices to accelerate chemical reactions in low-speed systems

This work shows the effectiveness of applying vortex layer devices to accelerate chemical reactions in low-speed systems, using the production of dioctylphthalate as an example. The influence of production conditions on the product properties is evaluated.

Deformation electromagnetic anisotropy of various physical states of highly cross-linked polymers

69 When choosing a highly cross linked polymer matrix for a high strength radiotransparent fiberglass ware with the increased isotropy and longevity of the radiotransparency coefficient, it is necessary to pre liminarily understand the value and stability of the deformation electromagnetic anisotropy the matrix can ensure in one relaxation state or another in the known fields of temperatures and mechanical stresses [1]. The mathematical formalism describing the origin of the deformation electromagnetic anisotropy of highly cross linked polymers is developed only for their rubbery state [1]. Therefore, in this work, we developed a mathematical model of the deformation electromagnetic anisotropy of highly cross linked polymers in all their relaxation states.

Estimation of topological structure of epoxycarbonate systems formed on amine-curing without heat supply

The effect of active cyclocarbonate-containing modifying agents on the topological structure of epoxyamine templates is considered. The estimation of the topological structure and the adequacy of the real process are presented.

Influence of the Nature of a Curing Agent on the Peculiarities of Formation of Vulcanization Networks in Polysulfide Sealants

The molecular mobility of vulkanizates of liquid thiokols cured with various vulcanizing agents was studied by the NMR method in a wide temperature interval. The influence of the nature of vulcanizing agents and the structure of the forming vulcanization network on the change in the character of molecular mobility in vulcanizates of polysulfide oligomers was established. The correlation of effective (υeff) and chemical (υch) densities of vulcanization networks of thiokol sealants with parameters of the NMR spectrum of the latter was found. The influence of the nature of a curing agent on the peculiarities of the formation of vulcanization networks of polysulfide oligomers is discussed.

Topological Structure of Amine-Cured Epoxycarbonate Systems

The fragility of polymeric materials is largely determined by the topological structure of the polymeric template [1]. Therefore, targeted modification of the structure of cross-linked polymers, including that using active modifying agents, is an important task. This study deals with the effect of propylene cyclocarbonate (PC) as an active modifying agent on the topological structure of cross-linked polymers obtained by curing the epoxy oligomer ED-20 with diethylenetriamine (DETA) without heat supply (at room temperature). The structure of a cross-linked polymer can be characterized by probabilistic calculations if the threedimensional polycondensation involves no “substitution effect,” i.e., the structure is a unique function of the conversion [2]. Otherwise, when the polycondensation is nonrandom, i.e., the polymer structure depends also on the reaction route, it can be characterized only by kinetic calculations or computer simulation.