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首页> 外文期刊>Polymers for advanced technologies >Synthesis of hydrogels by radiation-induced cross-linking of Pluronic F127 in N{sub}2O-saturated aqueous solution
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Synthesis of hydrogels by radiation-induced cross-linking of Pluronic F127 in N{sub}2O-saturated aqueous solution

机译：在N {sub} 2O饱和水溶液中辐射诱导的Pluronic F127交联合成水凝胶

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摘要

Pluronic F127, a tri-block copolymer of poly(ethylene oxide) and poly(propylene oxide) of a nominal formula EO{sub}100-PO{sub}65-EO{sub}100, when subjected to the action of ionizing radiation in oxygen-free, N{sub}2Osaturated aqueous solution, undergoes predominantly cross-linking by intermolecular recombination of polymer-derived radicals. This manifests itself as an increase in average molecular weight and, at sufficiently high doses, as a formation of permanent hydrogel. Cross-linking occurs with high yields. Side reactions include chain scission and traces of oxidation processes. Polymer concentration and temperature influence the yields of radiation-induced reactions. This indicates that radiolysis mechanism depends on the spatial arrangement of Pluronic molecules, which can be organized into single chains, micelles, and physical gel. Macroscopic hydrogels of Pluronic are thermo-sensitive (phase transition temperature behavior with the transition temperature, at the tested conditions, of ca. 27℃). Pluronic gels are prone to oxidative degradation, both in an aqueous environment and in the dry state, especially at elevated temperatures.
机译：Pluronic F127，当受到电离辐射作用时，标称式为EO {sub} 100-PO {sub} 65-EO {sub} 100的聚环氧乙烷和聚环氧丙烷的三嵌段共聚物在无氧的N {sub} 2O饱和水溶液中，聚合物衍生的自由基通过分子间重组而主要发生交联。这表现为平均分子量的增加，并且在足够高的剂量下表现为永久性水凝胶的形成。交联以高收率发生。副反应包括断链和氧化过程的痕迹。聚合物浓度和温度影响辐射诱导反应的产率。这表明辐射分解机制取决于Pluronic分子的空间排列，可以将其组织成单链，胶束和物理凝胶。 Pluronic的宏观水凝胶对热敏感（在测试条件下，相变温度行为和转变温度约为27℃）。在水性环境和干燥状态下，尤其是在高温下，Pluronic凝胶均易于氧化降解。

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