Hyperbranched polyimides crosslinked with ethylene glycol diglycidyl ether: Glass transition dynamics and permeability

Synthesis of novel fluorinated hyperbranched polyimides with excellent optical properties

“…Misutoshi Jikei et al reviewed the synthesis and properties of hyperbranched polyimide 25. Jie Yin and Bershtein et al investigated the application of hyperbranched polyimide (HBPI) in photosensitive materials and gas separation membrane, respectively 26, 27. Our laboratory explored several fluorinated hyperbranched polyimides (FHBPIs) for optical waveguide materials 28.…”

“…25 Jie Yin and Bershtein et al investigated the application of hyperbranched polyimide (HBPI) in photosensitive materials and gas separation membrane, respectively. 26,27 Our laboratory explored several fluorinated hyperbranched polyimides (FHBPIs) for optical waveguide materials. 28 The unique hyperbranched structure allows the isotropic orientation of PI's rigid aromatic segments, and thus reduces its birefringence value.…”

Hyperbranched Polyimides Prepared from 4,4 ́,4 ́ ́-Triaminotriphenylmethane and Mixed Matrix Materials Based on Them

“…Due to the MTA structure the identical reactivity ofits three amino groups is expectable which is one of the basic requirements of the regulary branched polymeric structure [8]. In the case of ODPA it was shown that the presence of the ether bridge (-O-) decreases the glass transition temperature of the final PI in comparison with those cases where different dianhydrides were employed [15].…”

“…The difficulties with the formation of a three-dimensional product were not observed if 2,4,6-triaminopyrimidine ( Figure 5) was employed as a monomer for the preparation of HBPI probably due to different reactivities of amino groups in the position 2 and positions 4 and 6 [8]. But, as a consequence of it, a less regular HBPI strucure is expectable.…”

Synthesis and properties of hyperbranched polyimides from A2+ B′B2 monomers and A2+ B′B2 + B2 monomers with various comonomer ratios

“…So, A 2 + B′B 2 approach have drawn much attention because it can avoid gelation during the preparation of hyperbranched polyimides to use monomers containing the same functional groups but with different reactivities. [19][20][21][22][23][24] In our work, we adopted 2,4,6-triaminopyrimidine(TAP) as a B′B 2 monomer for the preparation of hyperbranched polyimides, facile syntheses of HBPIs were realized by addition polymerization of A 2 + B′B 2 monomers while biphenyl dianhydride(BPDA) as a A 2 monomer. TAP shows different reactivities of the amino groups, which is not in accord with basic assumption of the same reactivity of the monomer functional groups in Flory's theory of gel formation .…”