Some aspects of the theory and practice of frontal polymerization pp.345-388
Authors: (H.H. Zakaryan, A.O. Tonoyan, S.P. Davtyan, State Engineering University of Armenia, Armenia)
Abstract: Quasi-stationary concentration principle (QSC) was used to study radical polymerization of vinyl monomers during reaction traveling front. Based on the experimental results and numerical calculation of the one-dimensional front, it was shown that the zone could be both narrow and wide. Full and quasi–stationary problems were solved for different sets of kinetic and thermo-physical parameters typical for vinyl monomers’ radical polymerization. Anion activated copolymerization of ε-caprolactam with ω-dodecalactam has been investigated during heat wave propagation. It was shown that separation of polymerization and crystallization auto waves takes place at 1300C (initial temperature of the reaction mixture). The observed limiting heating temperature oscillation leads to disruption of the crystallization auto waves. It was assumed that the reasons for these unstable regimes are the multiple sequential melting and crystallization processes. A thermometric method of determination of the composition of co-polymers is proposed. A one-dimensional and two-dimensional model of frontal solidification of epoxy compounds by the aromatic amines in tubular flux reactors is investigated. The influence of some kinetic factors on the velocity of traveling of the front, on the reactor heat regimes and on the geometric dimensions of the reactor is studied. Profiled armored carbon and glass plastics forming laboratory installation is constructed based on the obtained theoretical results. It was shown that the theoretical and practical results correspond satisfactorily. Several physical-mechanical properties (bending strength, longitudinal modulus of elasticity) as based on the reactor wall temperature, angle of armoring and tension is determined.