Citation: LI Changjiang, LI Changjiang. OPTICAL INTERFERENCE METHOD FOR THE STUDY OF MOISTURE SWELLING IN PET FILMS[J]. Chinese Journal of Polymer Science, ;1987, 5(3): 261-264. shu

OPTICAL INTERFERENCE METHOD FOR THE STUDY OF MOISTURE SWELLING IN PET FILMS

Received Date: 26 April 1986

A method for measuring moisture swelling of amorphous PET films by using Rayleigh interferometer is reported, Plots of the optical path of light transmission in the polymer vs. soaking time were obtained, and from the same curves, the dependence of time on the moisture swelling, saturated water absorption and diffusion coefficient of PET films were estimated. These results are in agreement with those obtained by weighing method. It is shown that optical interference method is a simple but sensitive method for the study of water absorption and swelling in transparent polymer films.
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