期刊
REACTIVE & FUNCTIONAL POLYMERS
卷 146, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2019.104411
关键词
Thermosetting polyimide; Alicyclic units; Low dielectric constant; Low melt viscosity
资金
- National Science Foundation of China (NSFC) [51973225, 51573094]
Semi-aromatic thermosetting polyimide resins containing alicyclic units were prepared by the polymerization of 1,2,4,5- cyclohexanetetrcarboxylic dianhydride (HPMDA), aromatic diamines and nadic anhydride (NA) served as reactive capping agent. To obtain the homogeneous poly (amic ester) (PAE) matrix resins, the 2-methoxyethanol (EGME) was used to esterify HPMDA. The chemical structure of PAE resins dried at different temperatures were characterized in detail by FT-IR, H-1 NMR and TGA-GCMS. Compared with the full-aromatic API-1, the alicyclic units with less Pi(pi) bonds and twisted structure endow the semi-aromatic PI resins with loose polymer chains packing and weak intermolecular forces, which contribute to low melt viscosities, good solubility and excellent dielectric properties. The cured semi-aromatic PI resins show low dielectric constants ranging from 2.8 to 3.0 and dielectric loss of < 0.01 at a range of frequencies from 1GHz to 12GHz. The results indicate the semi-aromatic thermosetting PI resins are promising dielectric interlayer materials for high frequency substrates.
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