The influence of H-donors on the photodecomposition of selected water-soluble photoinitiators

Polymer Photochemistry Pub Date : 1985-01-01 DOI:10.1016/0144-2880(85)90006-5

Rawdon A. Bottom, James T. Guthrie, Peter N. Green

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引用次数: 12

Abstract

Evidence is presented which shows that aqueous solutions of 4-(trimethylammoniummethyl)benzophenone chloride, BP2, are photochemically stable within experimental conditions applied. However, in aqueous solutions of BP2 which contain compounds capable of H-atom donation, then BP2 undergoes rapid decomposition. In terms of the enhancement of photodecomposition, the observed order is poly(vinyl alcohol) > propan-2-ol > ethanol > propan-1-ol > glucose > 1,3-propanediol > 1,2-ethanediol > methanol.

By contrast, 4-(sulphomethyl)benzil sodium salt, BZ1, is rapidly photodecomposed when irradiated in aqueous solution even in the absence of additional H-atom donors.

Information is given which shows that various monomers have the ability to reduce the level of photodecomposition of aqueous solutions of BP2 which contain propan-2-ol. Thus, 2-hydroxyethyl acrylate> 2-hydroxypropyl acrylate > acrylic acid in terms of reducing the extent of photodecomposition. In addition, details are presented regarding the concentration dependence of this photodecomposition process with regard to the presence of 2-hydroxyethyl acrylate. Finally, aspects of the photodecomposition of BP2 and BZ1, present in regenerated cellulose film, are considered.

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h给体对水溶性光引发剂光分解的影响

有证据表明，在实验条件下，4-(三甲基铵甲基)二苯甲酮氯(BP2)的水溶液具有光化学稳定性。然而，在含有能给予h原子的化合物的BP2水溶液中，BP2会发生快速分解。在促进光分解方面，观察到的顺序是聚乙烯醇>propan-2-ol祝辞乙醇比;propan-1-ol祝辞葡萄糖比;1、探索比;1、2-ethanediol比;甲醇。相比之下，4-(硫甲基)苄基钠盐，BZ1，即使在没有额外的h原子供体的情况下，在水溶液中辐照也能迅速光分解。给出的资料表明，各种单体具有降低含有丙二醇的BP2水溶液的光分解水平的能力。因此，2-羟乙基丙烯酸酯;丙烯酸2-羟丙酯>丙烯酸在降低光分解程度方面。此外，详细介绍了关于这种光分解过程的浓度依赖于2-羟乙基丙烯酸酯的存在。最后，讨论了再生纤维素膜中BP2和BZ1的光解作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polymer Photochemistry

CiteScore

1.20

自引率

0.00%

发文量