OP-II-3

PP-I-28γ-preirradiated sample), the characteristics of the processes in pure acetaldehydeand in the mixture with aluminum oxide differ noticeably. First of all, the critical γ-preirradiationdose necessary for triggering an acetaldehyde polymerization wave in theAl 2 O 3 –acetaldehyde system is much higher (600 kGy) than that for pureacetaldehyde (300 kGy). The measured wave velocities in the Al 2 O 3 –acetaldehydemixture are lower than those in pure acetaldehyde: at the critical irradiation dose,they are 3 and 5 mm/s, respectively, and at a dose of 900 kGy, they are 14 and38 mm/s, respectively According to theory [3], the increase in the critical irradiationdose necessary for triggering the autowave mode of transformation and the decreasein the reaction traveling wave front velocity, which were observed for acetaldehydewith filler, are indicative of strengthening of the matrix, i.e., an increase in the criticaltemperature gradient destroying the sample. The above data demonstrate thataddition of aluminum oxide powder to acetaldehyde leads to strengthening of thefrozen solid system, i.e., to difficulties in triggering the autowave mode ofpolymerization. However, an increase in the preirradiation dose gives rise to atraveling wave of transformation in the monomer–filler system. Thus, the resultsobtained for the model Al 2 O 3 –acetaldehyde system confirmed the possibility ofdeveloping a technology for producing composite materials at low (space)temperatures in traveling wave mode using space and solar radiation for activatingthe frozen monomer matrix. It is of interest to study the effect exerted on theautowave process by fillers of other types (fiberglass woven reinforcing components,metal grids, catalytically active fillers, etc.). These fillers may have a significant effecton the development of the autowave process. On the one hand, the strengtheningsuppresses cracking and decreases the velocity of wave propagation throughout thesample, but on the other, the presence of a component that increases the effectivethermal conductivity of the system may increase the reaction rate. It is also of interestto use catalytically active fillers, which allow one to create composite materials athigh rates of autowave transformation. And, of course, it is necessary to choosemonomers that would be suitable for creating composites with required propertiesby autowave transformation at low temperatures.References[1]. Barelko, V.V., Barkalov, I.M., Goldanskii, V.I., et al., Adv. Chem. Phys., 1988, vol. 74, pp. 339–384.[2]. Kiryukhin, D.P., Barkalov, I.M. Usp. Khim., 2003, vol. 72, no. 3, pp. 245–261.[3]. Barelko, V.V., Barkalov, I.M., Vaganov, D.A., et al., Khim. Fiz., 1983, vol. 2, no. 3, pp. 980–984.271