Measuring the Temperature and Humidity Dependence of Gas Diffusivity in Building Coatings by Using a Using Thermal Desorption System

作者：Kitagaki Ryoma^*

来源：Kobunshi Ronbunshu, 2018, 75(4): 347-357.

DOI：10.1295/koron.2018-0001

• Thermal Desorption System
• Temperature Dependency
• Humidity Dependency
• Gas Diffusion Coefficient

It becomes increasingly important to estimate the barrier performance of coatings used for buildings in proportion to the increasing demand of building longevity in recent years. However, the barrier performance of coatings for building use which is attached and mixed with various base materials is difficult to estimate by conventional methodologies. Therefore, a thermal desorption system (TDS) for estimating gas coefficients of permeability, solubility and diffusivity of coatings for building use has been applied and it's validity has been confirmed. As a result, the TDS method has been confirmed to be almost compatible with the conventional differential-pressure method, and additionally, it has been confirmed that the gas transfer in coatings for building use is dependent of temperature, humidity and interaction among the present gas species, as in conventional polymer films. The free-volume in coatings for building use can be estimated by the obtained data.

• 出版日期2018