一种新型的紫外吸收剂——二苯甲酰甲烷的光谱特性及光稳定能力的初步研究

本文研究了一种新型的紫外吸收剂——二苯甲酰甲烷的光谱特性。实验结果表明,在基态,它存在酮式-烯醇式的热化学平衡,且烯醇式形成六元环分子内氢键。在顺-1,4-聚丁二烯溶液光降解的比较实验中,二苯甲酰甲烷的光稳定能力和邻羟基-对正辛氧基二苯甲酮相近,并对光稳定行为的可能机理进行了研究。

A STUDY ON THE SPECTRA AND PHOTOSTABILIZING ACTION OF A NEW PHOTOSTABILIZER OF POLYMERS -DIBENZOYL METHANE

In this work, the absorption and fluorescence spectra of dibenzoyl methane have been studied. The structure of dibenzoly. methane is different from o-hydroxybenzophenones and o-hydroxyphenylbenzotriazoles. It has two absorption peaks at 252 nm and 340 nm as well as o-hydroxy-p-octyloxy benzophenone. The absorption at 340 nm is concerned with the formation of . intramolecular hydrogen bond. It has been found that an uncommonly large Stoke's shifts of fluorescence can be observed. The photostabilizing effect of dibenzoyl methane and o-hydroxy-p-octyloxy benzophenone on the photodegradation of cis-1,4-polybutadiene has been investigated for comparison. Its photostabilizing effect is similar to o-hydroxy-p-octyloxy benzophenone. Possible mechanism was discussed.