Reactive processing polymers by Alexander Ya Malkin, V. P. Begishev

By Alexander Ya Malkin, V. P. Begishev

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In order to estimate the kinetic effect of this increase 30 A. Ya. Malkin and V. P. Beghishev it is convenient to linearize the exponential term in Eq. 12). 21] where K O= k,e -U/RT, and The last factor reflects the role of the non-isothermal effect on the kinetics of the process. 22] dt We see that an increase in temperature leads to self-acceleration (as expected), but it is important to compare the two accelerating effects, of the reaction (factor a)and the other due to the increase in temperature (factor n).

075 mol/l), the dependence of the constant ko on [C] is as follows: 32 A. Ya. Malkin and V. P. 8. Dependencies P(t) in polymerization ofw-dodecalactam, initiated by an indirect activator, N-acetyl diphenylamine. Catalyst: Na. Initial temperature: 180°C. 5 mol% (curve 5). 27b] and if [C] is expressed in mol/l. This range of concentrationcovers the whole range used in practice. 8 processing it may be desirable not to start the reaction at the beginning of the process. Then an activator need not be present in an initial reactive medium but may be synthesized directly from some compounds during the process.

All these processes are quite similar to reactive processing. A great variety of materials belong to this class of products; therefore, it is impossible to construct a general kinetic model of curing of epoxy resins, and we are only able to formulate common approaches and discuss some typical results. The following main factors help to determine the course of the curing process for epoxy resins. First, a correlation exists between the change in concentration of the epoxy groups and the modulus of elasticity of the product.

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