Technical Information Magazine 202101-04 Evaluation of Barrier Films and Separation Membranes Using Positrons
The technical information magazine The TRC News provides the latest information on analytical techniques that are useful for research and development, solving production troubles, and quality control.
**Abstract** The development of materials with innovative barrier and separation properties, such as gas transport characteristics (permeability, diffusivity, and adsorption of gases and vapors), requires the evaluation of sub-nanometer void structures (voids less than 1 nm). Therefore, techniques for assessing molecular-level voids are needed, and positron annihilation lifetime spectroscopy becomes a powerful tool. This paper presents examples of approaching the relationship between sub-nanometer void structures and gas transport properties by synergistically utilizing positron annihilation lifetime spectroscopy and other methods on polyethylene terephthalate and silica thin films. **Table of Contents** 1. Introduction 2. Principles of Positron Annihilation Lifetime Measurement 3. Application Examples for PET with Different Crystallinities 4. Application Examples for Silica Thin Films with Different Densities 5. Conclusion
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