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本文研究了苯乙烯在空气存在下的γ辐照.用硅胶柱层析分离在辐射总剂量为5×10~4Gy,辐射剂量率分别为2.9,0.7,0.5和0.3Gy/s的条件下形成的过氧化物,发现剂量率在0.5Gy/s以上时产物都可分成三种组分,而组分分布随剂量率不同而异,当剂量率为0.3Gy/s时,产物只包含单一的,相当于第二组分的过氧化物.对剂量率为0.7Gy/s时生成的三种过氧化物组分用红外光谱,核磁共振谱和质谱进行了组分结构测定及其引发活性测定,发现具交替结构的第二组分有较强的引发活性,它在较低温度和较短时间内就能引发苯乙烯聚合,获得分子量166,578的聚合物,它还能引发其它乙烯类单体聚合,且聚合过程较用BPO引发剂平稳.
In this paper, the γ irradiation of styrene in the presence of air was studied.It was formed by silica gel column chromatography under the conditions of a total radiation dose of 5 × 10 ~ 4Gy, radiation dose rates of 2.9, 0.7, 0.5 and 0.3 Gy / s Of the peroxide, found that the product rate can be divided into three components when the dose rate is above 0.5Gy / s, and the component distribution varies with the dose rate. When the dose rate is 0.3Gy / s, the product contains only a single , Which is equivalent to the peroxide of the second component.The structure and activity of the three peroxide components generated at a dose rate of 0.7 Gy / s were measured by infrared spectroscopy, nuclear magnetic resonance spectroscopy and mass spectrometry , The second component with alternating structure was found to have a strong initiating activity which initiates the polymerization of styrene at lower temperature and in shorter time to obtain a polymer with a molecular weight of 166,578 which can also initiate the polymerization of other vinylic monomers Polymerization, and polymerization process more stable with BPO initiator.