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本文选用甲基异丙烯基酮(MIK)与甲基丙烯酸缩水甘油酯(GMA)在AIBN引发下于60℃进行自由基共聚合反应,并用λ≥290 nm的紫外光对共聚物的光降解行为进行了研究。通过对共聚物溶液及薄膜状态光降解实验,发现共聚组成对共聚物的光降解有一定影响,当共聚物中MIK含量在30%mol左右时,降解最快。对于组成相同的共聚物,分子量越大,光降解也越大。当温度升高时,光降解也会加快,但氧的存在将对共聚物的光降解产生较大的抑制。本文还对共聚物的光降解动力学进行了研究,结果表明共聚物的光降解反应为一级反应,活化能E_a=5.78 kcal/mol。通过紫外、红外光谱分析,本文认为共聚物的光降解按Norrish Ⅰ型反应发生无规降解。
In this paper, methyl isopropenyl ketone (MIK) and glycidyl methacrylate (GMA) were used to conduct the radical copolymerization reaction at 60 ℃ under the AIBN condition. The photodegradation behavior of the copolymer with λ≥290 nm UV light Were studied. Through the photodegradation experiments on the copolymer solution and the film state, it was found that the copolymer composition has some influence on the photodegradation of the copolymer. When the MIK content in the copolymer is about 30% mol, the degradation is the fastest. For the same copolymer, the larger the molecular weight, the greater the photodegradation. When the temperature rises, photodegradation will also accelerate, but the presence of oxygen will produce greater inhibition of the photodegradation of the copolymer. The photodegradation kinetics of the copolymer was also studied. The results showed that the photodegradation reaction of the copolymer was a first order reaction, the activation energy E_a = 5.78 kcal / mol. By UV and IR spectroscopy, it is considered herein that the photodegradation of the copolymer undergoes a random degradation according to Norrish type Ⅰ reaction.