日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

Zeolite have Negative Coefficient of Thermal Expansion (CTE) and can be used as filler to reduce the CTE of polymer. Although there are many candidates for negative thermal expansion materials, zeolite is considered to be one of the most promising negative expansion materials because of its low specific gravity and composition of common elements. This paper describes the properties of low expansion polyimide films prepared by blending zeolite as a filler with polyimide. Compared to common silica filler, zeolite filler significantly reduced the CTE of the composite with a small amount of addition. Certain zeolites, including CHA zeolite were found to reduce the CTE of compound higher than the calculated CTE obtained by Rule-of-Mixtures formulation.