• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >The concentration and origins of carboxylic acid groups in oil paint
【24h】

The concentration and origins of carboxylic acid groups in oil paint

机译：油漆中羧酸基团的浓度和起源

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Although the concentration of carboxylic acid (COOH) groups is crucial to understand oil paint chemistry, analytical challenges hindered COOH quantification in complex polymerised oil samples thus far. The concentration of COOH groups is important in understanding oil paint degradation because it drives the breakdown of reactive inorganic pigments to dissolve in the oil network and form metal carboxylates. The metal ions in such an ionomeric polymer network can exchange with saturated fatty acids to form crystalline metal soaps (metal complexes of saturated fatty acids), leading to serious problems in many paintings worldwide. We developed two methods based on ATR-FTIR spectroscopy to accurately estimate the COOH concentration in artificially aged oil paint models. Using tailored model systems composed of linseed oil, ZnO and inert filler pigments, these dried oil paints were found to contain one COOH group per triacylglycerol unit. Model systems based on a mixture of long chain alcohols showed that the calculated COOH concentration originates from side chain autoxidation at low relative humidity (RH). The influence of increasing RH and ZnO concentration on COOH formation was studied and high relative humidity conditions were shown to promote the formation of COOH groups. No significant ester hydrolysis was found under the conditions studied. Our results show the potential of quantitative analysis of oil paint model systems for aiding careful (re)evaluation of conservation strategies.
机译：虽然羧酸（COOH）基团的浓度至关重要，但是理解油漆化学，因此分析挑战是迄今为止复合聚合的油样中的阻碍COOH定量。 COOH基团的浓度在理解油漆降解方面是重要的，因为它驱动了反应性无机颜料的崩解，以溶解在油网络中并形成金属羧酸盐。这种离子聚合物网络中的金属离子可以与饱和脂肪酸交换以形成结晶金属皂（饱和脂肪酸的金属络合物），导致全球许多绘画中的严重问题。我们开发了基于ATR-FTIR光谱的两种方法，以准确估计人工老化油漆模型中的COOH浓度。使用由亚麻籽油，ZnO和惰性填充颜料组成的定制模型系统，发现这些干油漆每三酰基甘油单位含有一个COOH基团。基于长链醇的混合物的模型系统表明，计算的COOH浓度在低相对湿度（RH）下源自侧链自氧化。研究了rh和ZnO浓度增加对CoOH形成的影响，并且显示高相对湿度条件促进COOH基团的形成。在所研究的病症下发现没有明显的酯水解。我们的结果表明，对油漆模型系统进行定量分析的潜力，用于辅助仔细（重新）评估保护策略。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号