海藻酸钠的电离辐射降解研究

RADIATION INDUCED DEGRADATION OF SODIUM ALGINATE

采用γ射线辐照、激光光解和脉冲辐解技术,就海藻酸钠水溶液分子量与辐照剂量的关系,SO_4^(·-)氧化切断海藻酸钠C_1-O-C_4键的机理开展研究。探索了海藻酸钠辐射降解规律,推导其在γ射线照射下的降解,主要由水辐解产物羟基自由基进攻其C_1-O-C_4键,导致链断裂引起的。

Reaction rate constants of sodium alginate with both sulfate and carbonate anion radicals were determined by laser flash photolysis and pulse radiolysis, respectively. The relationship between molecular weight of the sodium alginate and absorbed dose was discussed. Degradations of the sodium alginate were caused by OH' radicals and other oxidative radicals, because the oxidation at the C-4 carbon resulted in the breakage of the glycosidic C1-O-C4 bond in the main chain of sodium alginate.