...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Progress in Organic Coatings: An International Review Journal >Water mobility during drying of hard and soft type latex: Systematic GARField H-1 NMR relaxometry studies
【24h】

Water mobility during drying of hard and soft type latex: Systematic GARField H-1 NMR relaxometry studies

机译：硬乳和软型乳胶干燥过程中的水迁移率：系统性加菲尔德H-1 NMR弛豫研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

GARField H-1 NMR relaxometry experiments were done to study the drying process of two latices with different polymer T-g and to elucidate water mobility behavior during this process. It was found that the hard type latex, with a polymer T-g above room temperature, dries faster than the soft type latex, with a polymer T-g below room temperature. Diffusion measurements by means of echo time variations at different moments in the drying process show that water auto-diffusion decreases with increasing solid content of the latex independent of particle T-g. Two pools of protons with different mobilities were observed based on transversal relaxation T-2. Determination of the long T-2,T-long'S and short T-2,T-short'S of both latex dispersions and their respective proton densities during drying at 80% RH showed evidence of particle deformation for the soft type latex and the absence thereof for the hard type latex. Additional drying of the resulting coatings with anhydrous CaCl2 showed a higher porosity for the hard type coating based on the proton distribution profile width. Moreover, two domains with different polymer proton mobilities are found for both coatings that are both plasticized by water at 80% RH. This is more apparent for the hard type coating, suggesting that a more hydrophilic polymer gives a higher degree of plasticization.
机译：完成加菲尔德H-1 NMR弛豫实验以研究两种胶乳与不同聚合物T-G的干燥过程，并在该过程中阐明水迁移率行为。发现硬型胶乳，具有高于室温的聚合物T-G，比软型胶乳干燥，聚合物T-G低于室温。通过干燥过程中不同矩的回波时间变化的扩散测量表明，随着胶乳的固体含量，水自动扩散随着颗粒T-G而越来越多地减小。基于横向松弛T-2，观察到具有不同迁移率的两池。在80％RH下干燥期间，测定长T-2，T-Long和短T-2，T短的胶乳分散体及其各自的质子密度显示了软型胶乳的颗粒变形的证据，并且不存在硬型乳胶。用无水CaCl2的所得涂层的另外的干燥表现出基于质子分布型宽度的硬型涂层较高的孔隙率。此外，对于通过水80％RH的水塑化的两种涂层，发现两个具有不同聚合物质子迁移率的两个结构域。对于硬型涂层来说更加明显，表明一种更亲水的聚合物呈现更高的塑化。

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