Department of Physical Chemistry of Polymers, Romanian Academy P. Poni Institute of Macromolecular Chemistry, Iasi, Romania.
Photochem Photobiol. 2011 Jul-Aug;87(4):779-85. doi: 10.1111/j.1751-1097.2011.00924.x. Epub 2011 Apr 12.
A series of experiments were carried out to investigate the photodegradation of lime wood (Tilia cordata Mill.) coated with acrylic copolymer during artificial UV/Vis light irradiation for 600 h. Photodegradation of the Paraloid B72 films and Paraloid B72 treated lime wood samples was evaluated by thermogravimetry throughout the irradiation period of 100 h. The results obtained indicate a shifting of the DTG maxima to lower temperatures, which may be related to a decrease in the stability of the copolymer and wood during photodegradation. The decrease of weight loss with increasing time of exposure was observed, while the global kinetic parameters for the main peak increases when increasing exposure time of wood to the UV light. Even when the surface of the wood was covered with a thin layer of acrylic resin, some photodegradation reactions of the wood surface occurred. The modifications in the wood structure may be influenced by the newly formed structures from acrylic resin photodegradation.
进行了一系列实验，以研究在人工 UV/Vis 光照射下，经过 600 小时后，涂有丙烯酸共聚物的椴木（Tilia cordata Mill.）的光降解情况。在 100 小时的照射期间，通过热重分析法评估了 Paraloid B72 薄膜和经 Paraloid B72 处理的椴木样品的光降解情况。结果表明，DTG 最大值向低温移动，这可能与共聚物和木材在光降解过程中的稳定性降低有关。随着暴露时间的增加，观察到失重减少，而当木材暴露于紫外光的时间增加时，主要峰的整体动力学参数增加。即使木材表面覆盖有一层薄薄的丙烯酸树脂，木材表面也会发生一些光降解反应。木材结构的变化可能受到丙烯酸树脂光降解产生的新结构的影响。
