✦ LIBER ✦

Water absorption in EVOH films and its influence on glass transition temperature

✍ Scribed by Zhongbin Zhang; Ian J. Britt; Marvin A. Tung

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 196 KB
Volume: 37
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(19990401)37:7<691::aid-polb20>3.0.co;2-v

No coin nor oath required. For personal study only.

✦ Synopsis

Moisture sorption kinetics of nonoriented ethylene vinyl alcohol copolymer (EVOH) film (EF-E15) were studied at 25, 35, and 45°C. Anomalous diffusion was observed for the polymeric film at high relative humidities (RH) and higher temperatures. Diffusion and solubility coefficients of water were found to be concentration dependent. The moisture sorption isotherms of three types of EVOH films (EF-E15, EF-F15, and EF-XL15) determined at 25, 35, and 45°C, were well described using the GAB equation. Glass transition temperatures (T g ) of the EVOH films, as influenced by RH, were measured using differential scanning calorimetry. T g values decreased with increasing RH due to the plasticization effect of water, and were found to be dependent on ethylene content and orientation of the EVOH films.

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