New autophotosensitive semiaromatic hyperbranched polyimides with excellent thermal stabilities and low birefringences

Abstract

A series of autophotosensitive semiaromatic hyperbranched polyimides were prepared by (A2 + B3)-type method and endcapped with 3-aminophenylacetylene. The photosensitive-hyperbranched polyimides (PHBPIs) showed excellent solubility, excellent optical properties, and low birefringences in the range of 0.0010–0.0027, caused by their special hyperbranched structures and alicyclic chain segments reduced both intramolecular and intermolecular charge transfer complex effect. The cured films also showed high glass transition temperatures between 204°C and 220°C, excellent thermal stabilities with 10% thermal decomposing temperatures in the range of 476–495°C, and good mechanical properties. The PHBPIs had photosensitivities (Dg) in the range of 80–162 mJ/cm2 and showed a clear negative image with a line width of 8 µm when exposed to an ultraviolet light of 365 nm (i-line).

Synthesis of new autophotosensitive semiaromatic hyperbranched polyimides with excellent mechanical properties and low birefringences

“…The mean intermolecular distances calculated from the peak maximum for the reflection WAXD patterns for PHBPI-1, PHBPI-2, PHBPI-3, and PLPI-4 were 5.33,4.92, 4.66, and 4.36 Å, respectively, which was mostly caused by hyperbranched structure and the increase of the partial regular structure based on the linear segment of BPADA/MSDS section. 19 The peak was raised with the increasing content of alicyclic diamine, which was reasonable because the linear segment of BPADA/MSDS interrupted the branched structure.…”

Aromatic Hyperbranched Polymers: Synthesis and Application

“…Photosensitive property studies revealed good photolithographic properties with a resolution greater than 3 μm and a sensitivity of 650-680 mJ/cm 2 . A series of autophotosensitive semi-aromatic hb-PIs end-capped with 3-aminophenylacetylene (1-53, Scheme 35) were prepared by Liu et al [303]. Photosensitivities of hb-PIs were obtained in the range of 80-162 mJ/cm 2 , and they showed a clear negative image with a line width of 8 μm when exposed to UV light of 365 nm.…”

The One‐Stage Synthesis of Hyperbranched Polyimides by (A2+B4) Scheme in Catalytic Solvent

“…combine with unique properties of PIs such as thermal, chemical and photo stability. HB PIs can be used as photoresist materials, and proton conducting membranes . There is also one more application area of HB PIs in gas separation membranes.…”