摘要
分别以聚酰胺酸法和部分酰亚胺化的“凝胶法”研究了均苯二酐/二苯醚二胺(PMDA/ODA)和联苯二酐/对苯二胺(BPDA/PPD)体系聚酰亚胺薄膜在制膜过程中对单向拉伸比的影响,研究了薄膜在热膨胀系数和力学性能方面的差别。结果表明,“凝胶法”薄膜可以有较高的拉伸比,可以使薄膜有较低的热膨胀系数(对于PMDA/ODA,由35.1×10-6/℃降低到12.5×10-6/℃),可以明显提高拉伸方向的强度和模量,PMDA/ODA可以分别达到236MPa和1.7GPa;BPDA/PPD可以分别达到613MPa和9.3GPa,但伸长率有所降低。
PMDA/ODA and BPDA/PPD based polyimide films prepared from polyamic acid solution （PAA method） and partly imidized polyamic acid solution （gel method） were investigated. The self-supported film with the gel method had lower solid content than that with the PAA method, and the film with lower solid content could be unistretched at higher ratio, hence make the film lower coefficient of thermal expansion （CTE） （for PMDA/ODA decreased from 35.1 × 10^ -6/℃ to 12.5 × 10 -6/℃ ）, higher tensile strength as well as modulus （for PMDA/ODA they were 236 MPa and 1.7 GPa, respectively; for BPDA/PPD they were 613 MPa and 9.3 GPa, respectively）, but lower elongation. The CTE and elongation of the films determined in machine direction were lower than those in transversal direction, but the strength and modulus in machine direction were much higher than those in transversal direction.
出处
《应用化学》
CAS
CSCD
北大核心
2007年第3期331-334,共4页
Chinese Journal of Applied Chemistry
