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Negative thermal expansion (NTE) ZrW2O8 powders were prepared by step-by-step solid-state reaction with ZrO2 and WO3 powders. The coefficient of thermal expansion (CTE) of the as-prepared ZrW2O8 was around -5.08×10-6 K-1 at 20–700℃. Different amounts of ZrW2O8 powders were added in BTDA-ODA polyamic acid to form polyimide/ZrW2O8 composites (PI/ZrW2O8). With the increment of ZrW2O8, experimental results show that ZrW2O8 powders can significantly enhance the thermal stability of the composites, and reduce the thermal expansion. A 50 wt pct ZrW2O8 addition can give rise to a 31% reduction of CTE. It is suggested that the PI/ZrW2O8 composites have potential applications in high performance microelectronic devices.
The coefficient of thermal expansion (CTE) of the as-prepared ZrW2O8 was around -5.08 × 10 -6 K- 1 at 20-700 ° C. Different amounts of ZrW2O8 powders were added in BTDA-ODA polyamic acid to form polyimide / ZrW2O8 composites (PI / ZrW2O8). With the increment of ZrW2O8, the experimental results show that ZrW2O8 powders can significantly enhance the thermal stability It is suggested that the PI / ZrW2O8 composites have potential applications in high performance microelectronic devices.