2020
DOI: 10.1590/0104-1428.10019
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Abstract: Two series of fluorinated copolymerized polyimide films with different dianhydride ratios were prepared via the conventional two-step method by using 4,4-oxydianiline(ODA) as the diamine monomer, 4,4'-(hexafluoroisopropylidene) diphthalic anhydride(6FDA), 4,4'-oxydiphthalic anhydride(ODPA) and 3,3',4,4'-biphenyl tetracarboxylic dianhydride(BPDA) as the dianhydride monomer in N, N-dimethylacetamide. With the increase of 6FDA in the proportion of dianhydride, the tensile strength of the polyimide film showed a d… Show more

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Cited by 3 publications
(4 citation statements)
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References 30 publications
(28 reference statements)
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“…There is a direct relationship between the electronic properties of aromatic diamines and dianhydrides constituting the PI's structure, while embedding alicyclic and perfluorinated components proved to be a suitable strategy bringing transparency. 16 Emissive polymeric materials with persisting thermal, chemical and mechanical stability are another important class of organic materials. Due to a variety of additional valuable properties such as (thermally activated delayed) fluorescence, phosphorescence, redox activity and electrochromism, emissive PIs 17 evolved into very attractive and burgeoning macromolecules with manifold applications.…”
Section: Introductionmentioning
confidence: 99%
“…There is a direct relationship between the electronic properties of aromatic diamines and dianhydrides constituting the PI's structure, while embedding alicyclic and perfluorinated components proved to be a suitable strategy bringing transparency. 16 Emissive polymeric materials with persisting thermal, chemical and mechanical stability are another important class of organic materials. Due to a variety of additional valuable properties such as (thermally activated delayed) fluorescence, phosphorescence, redox activity and electrochromism, emissive PIs 17 evolved into very attractive and burgeoning macromolecules with manifold applications.…”
Section: Introductionmentioning
confidence: 99%
“…20 Various strategies have been explored, including the introduction of electronegative groups, aliphatic rings, bulky substituents, rigidly non-coplanar structures, and asymmetric structures. [21][22][23][24][25][26][27][28][29][30][31][32][33][34] However, it is important to note that these modifications often concentrate on specific aspects such as enhancing solubility, improving optical transparency, or reducing CTC formation in PIs. It remains challenging to achieve comprehensive improvements in their overall performance.…”
Section: Introductionmentioning
confidence: 99%
“…To address the above weakness, extensive efforts have been devoted to the chemical modification of polyimides (PIs) 20 . Various strategies have been explored, including the introduction of electronegative groups, aliphatic rings, bulky substituents, rigidly non‐coplanar structures, and asymmetric structures 21–34 . However, it is important to note that these modifications often concentrate on specific aspects such as enhancing solubility, improving optical transparency, or reducing CTC formation in PIs.…”
Section: Introductionmentioning
confidence: 99%
“…Studies had shown that the introduction of orientation structure could effectively eliminate the CTC effect within the molecule, and the introduction of macrogroup side groups could effectively eliminate the CTC effect between molecules. [30,31] The solvent contains amides, which were prone to oxidation in the heating process to make the film darker. A gradient vacuum method was developed, which could effectively remove the influence of solvent without affecting the flowability of PAA glue soluting and the performance of PI film.…”
Section: Introductionmentioning
confidence: 99%