✍ Scribed by Rafil Basheer; Malcolm Dole
No coin nor oath required. For personal study only.
Kinetic equations for the decay of the free radicals in polymeric solids are given for the following assumptions on which they are based: (1) two simultaneous first‐order but physically separated decay reactions; (2) two simultaneous noninteracting second‐order decay reactions; (3) combined simultaneous but intermingled first‐ and second‐order decay reactions; (4) the same but for independent, i.e., not intermingled, first‐ and second‐order decay reactions; (5) a second‐order decay reaction in the presence of some free radicals that do not decay; and (6) a first‐order decay reaction in the presence of some free radicals that do not decay. In all of the above physical systems the total concentration only can be measured. Hence the above kinetic equations refer to the change of the total concentration with time. It is found that the data for the decay of the free radicals in irradiated isotactic polypropylene and 61% styrene‐39% butadiene block copolymer agree best with the equations for the second‐order decay in the presence of a fraction of nondecaying free radicals.
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