Prediction of the Long Term Stability of Polyester-Based Recording Media.
NATIONAL BUREAU OF STANDARDS WASHINGTON DC CENTER FOR MATERIALS SCIENCE
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Aging studies with polyethylene terephthalate film base indicate the lifetime is equal to about 1000 years if the material is stored at 20-25 deg C and 50 relative humidity. Concentration changes of acid and alcohol groups that occur as a result of aging have been measured by infrared analysis. Rate constants calculated by this method agree reasonably well with those calculated from acid contents determined by titration. Crosslinked polyester polyurethanes were prepared as models of the binder of magnetic tape. Aging studies with these materials indicate that they hydrolyze more slowly than ordinary polyester polyurethanes. Samples aged at 85 deg C at 100, 50, and 25 relative humidity eventually deteriorated greatly in a physical sense. jg p3
- Polymer Chemistry
- Organic Chemistry
- Recording and Playback Devices