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In order to improve the adhesion of thermoplastic polyimide (TPI) between thermosetting polyimide (PI) film and copper foil in two-layer flexible copper clad plate (2L-FCCL), a series of TPI samples were prepared by one-step reaction using flexible aromatic dianhydride monomers and aromatic or alicyclic diisocyanate monomers. Then, the selected TPI solution was directly coated on the pretreated commercial thermosetting PI film to obtain the composite film, and the corresponding 2L-FCCL was obtained by hot pressing at high temperature. By observing the state of the TPI reaction solution and conducting DSC testing, TPI-8 is selected, which is soluble in organic solvent and has a Tg of 226.5℃. Then, TGA, TMA, and tensile tests show that the 2% thermal decomposition temperature (T2%) of TPI-8 is 464℃, the thermal expansion coefficient (CTE) of 50-200℃ is 64.25×10-6℃-1, the tensile strength is 64.52 MPa, the elastic modulus is 1.75 GPa, and the elongation at break is 62%, and its chemical structure is confirmed by FTIR. Finally, the effect of alkaline pretreatment time of two kinds of thermosetting PI films on the bonding properties of resulting FCCLs was studied. It is found that the 90° peel strength (90°PS) of FCCLs are over 0.7 N/mm and the maximum value is 0.94 N/mm after SPI films treated with alkaline water at 60℃ for 1 min and 3 min. However, the 90°PS of FCCLs obtained by UPI films treated with the same hot alkaline water for 1-7 min are all less than 0.6 N/mm. Therefore, this method can be used to quickly and simply prepare TPI by one step, which is soluble and has good thermal, mechanical properties and dimensional stability. Meanwhile, it has good bonding properties for copper foil and SPI that the surface was pretreated with alkali water, and meets the requirements of relevant FCCL standards.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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