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测量了聚酰亚胺薄膜在冷热循环过程中各温度点的热膨胀系数。结果表明:聚酰亚胺薄膜的热膨胀系数具有不稳定性,当经四次冷热循环后才趋于稳定
The thermal expansion coefficient of the polyimide film at each temperature point during the thermal cycling was measured. The results show that the thermal expansion coefficient of polyimide film is unstable and tends to be stable after four cycles of cooling and heating