Abstract
This paper, aimed principably at discussing the effect of various factors on the initiating behavior of the peroxide formed during the irradiation of MMA, treats upon the effects of radiation temperature, temperature and duration of storing on the change of initiating behavior. The major results obtained are: 1. Neither the total radiation dose nor the dose rate will affect the initiating behavior of the peroxide formed in the irradiation of MMA. 2. The amount of peroxide formed below 0°C bears no relation to the radiation temperature T, while it is related to the 16.3 power of T above 0°C. By irradiating MMA at higher temperatures, the initiating behavior of the peroxide formed will be changed. The activation energy for forming peroxide amounts to 11 kcal/mol. 3. The irradiated samples stored in dry air were placed in thermostats for 600–900 hr at -20, 0, 7, 15, 25 and 35°, respectively. The sample stored at -20°C was fairly stable, unchanged in properties, and its polymerization progress was completely identical with that of the sample not stored. In case the sample was placed at a temperature above 0°C, however, the increase in the rate of polymerization was significant even if the peroxide concentration had been greatly increased. Contraily, in some cases, it would be decreased, especially when the samples were placed at temperatures higher than ambient, the polymerization progress would be changed a great deal. 4. The relation of the amount of peroxide produced with dose ( D, rad), dose rate ( I, sar/sec), and radiation temperature ( T, °K) can be represented by: N - 1.29 x 10 -7 x I -0.5 D( T/295) 16.3. 5. The relation of the amount of peroxide produced with the temperature (τ s, °C) and duration ( t a , days) of storing can be represented by: N = 0.02 t s -0.24 τ slog 55 t 0.7 s . 6. An apparent absorption peak could be obtained with a spectrophotometer at a wave length of 300–350 mu (UV) in case that the sample has been both irradiated and placed in the presence of O 2. The higher the temperature or the longer the storing time, the stronger the absorption peak.
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