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首页> 外文期刊>Macromolecular chemistry and physics >Visible Light Induced Emulsion Polymerization: An Improved Photoinitiation System Based on Amphiphilic Tertiary Amine N-Oxides
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Visible Light Induced Emulsion Polymerization: An Improved Photoinitiation System Based on Amphiphilic Tertiary Amine N-Oxides

机译:可见光诱导乳液聚合:基于两亲叔胺N-氧化物的改进的光引发体系

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摘要

A new method for visible-induced emulsion polymerization is successfully demonstrated. Photoinitiators are used upon irradiation with visible light to undergo sequential photodecomposition, demonstrating an effective way to generate radicals with octadecylamine ethoxylates N-oxide (AO-1805, EO = 5). AO-1805, acting both as a surfactant and mediator simultaneously, is proposed for free radical generation through synergistic effects with the photoinitiator, which differs greatly from organoboron compounds, especially in emulsions. Comparative experiments are carried out with nonylphenol ethoxylates (NP-10, EO = 5) upon irradiation with UV and visible light in order to examine the nature of the photoinitiated emulsion polymerization with AO-1805. The laser flash photolysis method is then used to study the interaction between AO-1805 and free radicals. The emulsion photopolymerization of styrene may be successfully mediated by AO-1805, with good control over molecular weight. A synergistic effect between radicals and AO-1805 is observed in the UV irradiation process that can further mediate radical polymerization. In visible light-induced emulsion polymerization, AO-1805 also has a novel stabilizing role because of the interaction between D1 and AO-1805. Moreover, it is hard to see such a trend with the NP-10/D1 combination, indicating that the functional group (N-oxide) of AO-1805 plays an important role in photoinitiation and has an influence on the overall polymerization rate.
机译:成功地证明了可见引发乳液聚合的新方法。在可见光照射下使用光引发剂进行顺序的光分解,证明了用十八烷基胺乙氧基化物N-氧化物(AO-1805,EO = 5)产生自由基的有效方法。提出同时用作表面活性剂和介体的AO-1805通过与光引发剂的协同作用产生自由基,这与有机硼化合物有很大的不同,特别是在乳液中。在紫外线和可见光照射下,用壬基酚乙氧基化物(NP-10,EO = 5)进行比较实验,以检查AO-1805光引发乳液聚合的性质。然后使用激光闪光光解法研究AO-1805与自由基之间的相互作用。苯乙烯的乳液光聚合可以由AO-1805成功介导,并具有良好的分子量控制能力。在紫外线辐射过程中观察到自由基与AO-1805之间的协同效应,可以进一步介导自由基聚合。在可见光引发的乳液聚合中,由于D1和AO-1805之间的相互作用,AO-1805还具有新的稳定作用。此外,用NP-10 / D1组合很难观察到这种趋势,表明AO-1805的官能团(N-氧化物)在光引发中起重要作用,并且对总聚合速率有影响。

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