4.7 Article

The location of adsorbed water in pigmented epoxy-amine coatings

期刊

PROGRESS IN ORGANIC COATINGS
卷 173, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2022.107223

关键词

Stress; Water uptake; Coatings; AFM-IR

资金

  1. AkzoNobel
  2. EPSRC [EP/S004963/1]

向作者/读者索取更多资源

Pigmentation can worsen water uptake in protective paints, leading to delamination, swelling, and plasticization. Poor adhesion, hygroscopic interphase near pigment particles, and internal stress are the potential mechanisms involved. This study used nanoscale chemical mapping and nanothermal analysis to investigate these mechanisms in model coatings. The findings showed no chemical interphase near wax-coated particles, while attenuated thermal expansion and increased Tg values of the polymeric binder indicated favorable polymer-pigment interaction and increased internal stress.
Pigmentation can exacerbate problematic water uptake into protective paints, leading to detrimental effects such delamination, swelling and plasticization. Potential underlying mechanisms include poor adhesion between the pigment and binder, the formation of hygroscopic interphase regions close to the pigment particles, and internal stress. Here, we demonstrate the use of nanoscale chemical mapping using AFM-IR and nanothermal analysis to investigate the contribution of these mechanisms directly for model coatings based on diglycidyl ether of bisphenol-A (DGEBA) cross-linked with triethylenetetramine (TETA). Whilst moisture uptake increases in the presence of a microscale silica matting agent, no chemical interphase could be detected close to the wax-coated particles. Instead, nanothermal analysis reveals attenuated thermal expansion of the polymeric binder and raised Tg values, supporting favourable polymer-pigment interaction and an increase in internal stress in the polymeric network. This is confirmed by mapping water distributions directly using AFM-IR, where no accumulation at the intact pigment-polymer interface/interphase is detected. Finally, further evidence is provided by bulk thermal analysis, where increased plasticization and desorption enthalpies demonstrate that water sorption into the bulk polymer binder increases as a function of added pigment volume concentrations.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据