Imparting low dielectric constant and high modulus to polyimides via synergy between coupled silsesquioxanes and crown ethers

Surface characterization and degradation behavior of polyimide films induced by coupling irradiation treatment

“…T g , which is taken from the peak temperature of the tan δ curve and also known as glass transition temperature, provides direct insight into the segmental mobility of macromolecular chains. 45 After the coupling treatment by the fluence of 5 × 10 14 cm −2 , T g increases from 405.4 °C to 412.5 °C and the rise in the glass transition temperature could be attributed to an increasing crosslinking in polyimide. 31 After that, T g decreases gradually with the increase of electron fluence.…”

“…It can be inferred that the degradation effects of the coupling treatment lead to decreased stiffness of polyimide films. 45 …”

Dielectric Properties of Fluorinated Aromatic Polyimide Films with Rigid Polymer Backbones

“…It is an effective way to reduce the dielectric constant of the polymer by decreasing the molar polarizability or increasing the molar volume of the molecules. Hence, the dielectric constants of polyimides could be reduced by introducing fluorine [ 5 , 6 , 7 , 8 ], aliphatic/alicyclic structure [ 9 , 10 , 11 ], large side groups [ 12 , 13 , 14 , 15 , 16 ] or air [ 17 , 18 , 19 , 20 ] into polymer backbones. Zhi et al [ 21 ] synthesized a series of semi-aromatic polyimide sheets, which were derived from the copolymerization of an alicyclic tetrahedral dianhydride (HBPDA) and an aromatic diamine mixture containing three flexible diamines.…”

Polyimide/crown ether composite film with low dielectric constant and low dielectric loss for high signal transmission

“…However, in this paper, the dielectric constant and loss were tested at high frequencies (10 GHz) and the minimum dielectric constant can be low to 2.33. In Chuqi Shi 10 and Ruxin Bei 47 results, the dielectric constants are 2.50 and 2.44 respectively. Compared with the 2.33 dielectric constant obtained from this study, our data is relatively better.…”

“…The inherent dielectric constant of conventional PIs lies at approximately 3.5, however, a lower value is usually required to minimize the power dissipation and delay of signal transmission in inter-layer dielectrics for ultra-large-scale integrated circuits, high frequency communication antenna substrate, and millimeter wave radar. [8][9][10][11] Many methods have been studied to reduce the dielectric constant and the dielectric loss of PIs by decreasing the polarization between imide groups on the main chains. 12 The molecular structure of the PI polymer plays a major role in its dielectric properties.…”