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本文研究了在~(60)Co γ射线作用下,分别用氢氧化钠和氮川三丙酰胺[N(CH_2CH_2CONH_2)_3]水溶液作为添加剂,对丙烯酰胺(简称AM)辐射聚合的影响。通常控制氢氧化钠含量在0.34—0.72％,吸收剂量为(1.1—3.3)×10~4拉德,可以得到水溶性好、分子量5×10~6左右的聚丙烯酰胺(简称PAM)。用氮川三丙酰胺水溶液作为添加剂,在聚合体系中其含量在1.5—2.5％范围内,可以得到水溶性好,分子量3×10~6以上的PAM;含量低于上述范围则出现交联不溶物;超过3％,分子量明显降低。在我们的实验条件下,在加入氨水的AM反应体系中,得到了氮川三丙酰胺结晶,而在氢氧化钠的AM体系中,未得到氮川三丙酰胺结晶。核磁共振波谱表明,氢氧化钠0.53％,AM67％的体系,在室温下氮川三丙酰胺生成量约0.06％。本文还讨论了AM辐射聚合过程中聚合链的氢自由基H交联机制。
In this paper, the effects of sodium hydroxide and N (CH 2 CH 2 CONH 2) _3] aqueous solution on the radiation polymerization of acrylamide (AM) under the action of ~ (60) Co γ-rays were studied. Usually controlled sodium hydroxide content of 0.34-0.72%, the absorbed dose (1.1-3.3) × 10 ~ 4 rad, get water-soluble, molecular weight of about 5 × 10 ~ 6 polyacrylamide (referred to as PAM). With the aqueous solution of N, N-tripropanamide as an additive, its content in the polymerization system is in the range of 1.5-2.5%, a good water-soluble PAM with a molecular weight of 3 × 10 -6 or more can be obtained; when the content is lower than the above range, More than 3%, molecular weight decreased significantly. Under the conditions of our experiment, the aztreotide tripropionamide crystals were obtained in the AM reaction system with ammonia addition, whereas in the AM system of sodium hydroxide, the azide tripropionamide crystals were not obtained. Nuclear magnetic resonance spectroscopy showed that sodium hydroxide 0.53%, AM67% of the system, at room temperature nitrogen tripropyl amide formation of about 0.06%. This article also discusses the hydrogen radical H crosslinking mechanism of the polymeric chain during AM radiation polymerization.