| 摘要 |
<p>A polyimide film inhibited from being dimensionally changed by thermal stress, in particular, a polyimide film which, when bonded to a metal layer by laminating, has the function of inhibiting the materials from having a thermal strain. In the polyimide film, (1) the storage elastic modulus has an inflection point in the range of 270-340°C, (2) the value of tandelta obtained by dividing the loss modulus by the storage elastic modulus has a peak top in the range of 320-410°C, (3) the storage elastic modulus as determined at 380°C is 0.4-2.0 GPa, and (4) the storage elastic modulus at the inflection point, alpha1 (GPa), and the storage elastic modulus at 380°C, alpha2 (GPa), satisfy the relationship 85>={(alpha1-alpha2)/alpha1} x 100 >= 65. When bonded to a metal layer by laminating, this polyimide film inhibits the materials from having a thermal strain.</p> |
