Photo-induced degradation of cellulose
Photo-induced degradation of cellulose
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DOI：
10.1016/j.polymdegradstab.2005.01.003
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发表时间：
2005-07-01
影响因子：
5.9
通讯作者：
Haillant, O
中科院分区：
文献类型：
--
作者：
Malesic, J;Kolar, J;Haillant, O
光照射被认为是在环境条件下对纤维素基材施加损伤的主要来源之一。然而，与纤维素热老化的研究相反，光诱导纸张降解的研究却很少，本研究表明，在λ 340 nm的光照射下，纤维素发生了广泛的氧化降解，并伴随着羟基自由基的形成。如分子排阻色谱法所示，降解不是随机的。在辐照样品中没有出现高分子量部分，这意味着交联不是主要过程。这证明了对光照射的纤维素材料使用粘度计是合理的。研究表明，碳酸镁的加入可以减缓纸浆的降解速度、羰基生成速度和白度下降速度。© 2005爱思唯尔有限公司版权所有。
Irradiation by light is considered to be one of the primary sources of damage exerted upon cellulosic substrates at ambient conditions. Yet, contrary to studies on thermal ageing of cellulose, only limited attention is devoted to light induced degradation of paper.This research demonstrates that extensive oxidative degradation of cellulose, accompanied by formation of hydroxyl radicals, occurs during exposure to light with λ > 340 nm. As demonstrated by size exclusion chromatography, degradation is not random. No high-molecular weight fraction appears in the irradiated sample, meaning that cross-linking is not a dominant process. This justifies the use of viscometry for light-irradiated cellulosic materials. Studies show that the rate of degradation, carbonyl formation and brightness decrease may be reduced by addition of magnesium carbonate. © 2005 Elsevier Ltd. All rights reserved.