科研之友
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摘要
A new diamine monomer, 3,3-diisopropyl-4,4-diaminophenyl-4-phenyltouene, was designed, synthesized, and then polymerized with five commercial dianhydrides to obtain a series of novel polyimides via a one-step method. The obtained polymers showed excellent solubility in most common solvents, even in low-boiling solvents, such as chloroform, dichloromethane, and tetrahydrofuran. They exhibited a high thermal stability with the glass-transition temperature in the range 262-318 degrees C and 10% weight loss temperatures in the range 464-488 degrees C under a nitrogen atmospheres. Meanwhile, these polymer films also displayed a high optical transparency with a cutoff wavelength in the range 305-365 nm; prominent mechanical properties with a tensile strength of 65.6-94.9 MPa, a Young's modulus of 1.6-2.8 GPa, and an elongation at break of 9.3-13.7%; a low dielectric constant in the range of 2.91-3.18 at 1 MHz; and an outstanding hydrophobicity with a contact angle above 90.6 degrees.
