Zobrazeno 1 - 10
of 55
pro vyhledávání: '"V.P. Begishev"'
Publikováno v:
Journal of Engineering Physics and Thermophysics. 63:1045-1049
A calculation scheme is proposed to determine external pressure during frontal crystallization of a polymeric sphere in an effort to compensate internal stresses. An analytical dependence which relates an external pressure with the crystallization fr
Publikováno v:
Rheologica Acta. 31:345-350
Simultaneous measurements of the components of dynamic modulus at the set of frequencies were made by Fourier-Transform Mechanical Spectroscopy (FTMS) to investigate the curing process of a segmented polyurethane.
Publikováno v:
Journal of Engineering Physics. 61:1092-1095
An analytical dependence of the final degree of crystalline structure on the rate of temperature variation is obtained for polymer material. It is shown that the formula obtained ensures satisfactory agreement with experiment in a broad range of cool
Publikováno v:
Polymer Science U.S.S.R.. 31:232-236
A new method is proposed for restoring the true form of the experimental curves on treating the calorimetric data obtained for fast curing reactions. A filter is constructed ensuring restoration of the true form of the signal with an accuracy to 10%.
Publikováno v:
Polymer Science U.S.S.R.. 27:2081-2088
The process of obtaining polyurethane elastomers has been studied by adiabatic calorimetry with curing of the macrodiisocyanate with diamine. To describe the kinetics of heat release a macrokinetic equation of the auto-inhibiting type is proposed. Th
Publikováno v:
Polymer Science U.S.S.R.. 25:2839-2845
A study was made of the general formulation of the problem of non-isothermal crystallization of polymers in a heterogeneous temperature field. In the crystallization of bulk polycaprolactum it was found possible to describe this process by an autocat
Publikováno v:
Journal of engineering physics. 46:104-108
We present a comparative analysis of a macrokinetic type equation and the AvramiKolmogorov equation for describing the crystallization of polymers. We show that the macrokinetic equation agrees with experiment over the whole range of the degrees of t
Publikováno v:
Polymer Science U.S.S.R.. 25:503-510
A study was made of the general theory of calculating molecular characteristics of polymers obtained by “live” polymerization in a tubular reactor of finite length. A special feature of calculating MWD is the consideration of fundamental kinetic
Publikováno v:
Polymer Science U.S.S.R.. 29:741-745
A multi-frequency non-harmonic dynamic method is proposed for observation of the evolution of a chemical and physical network during crosslinking in elastomers. Using poly-urethane as an example, the experimental data are treated by means of an appro
Publikováno v:
Polymer Science U.S.S.R.. 25:2270-2275
Various methods were used to study kinetics of initial stages of curing polyurethanes by using a bifunctional curing agent. It was shown that under reaction conditions practically excluding biuret formation already in the initial stages three-dimensi