Typical Values of Reaction Parameters

TABLE 3-10 Reaction Parameters in Radical Chain Polymerization 

Quantity Units General Range of Values Methacrylamide Photopolymerization  

TABLE 3-11 Kinetic Parameters in Radical Chain PolymerizationII , . i 

The rate constants for propagation and termination have been determined for many monomers. Table 3-11 lists values for some of the common monomers. These data were based on rotating sector experiments. The monomers have been listed in order of decreasing kp values (which does not necessarily correspond to the exact order of decreasing kt values). The order of kp values is discussed in Sec. 6-3b, since kp is a function of both monomer reactivity and radical reactivity. 

The reader is cautioned that there is often a considerable divergence in the literature for values of rate constants [Buback et al., 1988, 2002], One needs to examine the experimental details of literature reports to choose appropriately the values to be used for any needed calculations. Apparently different values of a rate constant may be a consequence of experimental error, experimental conditions (e.g., differences in conversion, solvent viscosity), or method of calculation (e.g., different workers using different literature values of kd for calculating Rt, which is subsequently used to calculate kp/kXJ2 from an experimental determination of Rp). 

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