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Synthesis and properties of polyimide-clay hybrid films

✍ Scribed by Kazuhisa Yano; Arimitsu Usuki; Akane Okada

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
192 KB
Volume
35
Category
Article
ISSN
0887-624X

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✦ Synopsis

Polyimide-clay hybrid films with four different sizes of clay minerals have been synthesized to investigate the effect of the size of clay minerals to the properties of the hybrids. Hectrite, saponite, montmorillonite, and synthetic mica were used as clay minerals. Those clays consist of stacked silicate sheets about 460 A ˚(hectrite), 1650 A ˚(saponite), 2180 A ˚(montmorillonite), and 12300 A ˚(synthetic mica) in length, 10 A ˚in thickness. The longer the length of clay mineral was, the more effectively properties of polyimide were improved. In the case of polyimide-mica hybrid, only 2 wt % addition of synthetic mica brought permeability coefficients of water vapor to value less than one-tenth of that of ordinary unfilled polyimide, and thermal expansion coefficient was lowered at the level of 60% of the original one.

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