Electroactive Polyimides: Synthesis, Characterization and Photophysics

Khalid, Naila; Siddiqi, Humaira M.

doi:10.1080/03602559.2016.1247274

Cited by 4 publications

(14 citation statements)

References 14 publications

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“…It also shows that the termination at anhydride on one hand and the amine on the other hand. The higher polydispersity index in the range 2–3 in comparison to the linear polymers (1.5–1.6) is attributed to the presence of hyperbranched and linear units with various functional groups on its surface 21,22 …”

Section: Resultsmentioning

confidence: 99%

“…Several factors affecting the T g of a polymer such as molecular weight distribution, cavities in polymeric structure, the bulkiness of the pendant on the main polymer backbone, and rigidity/flexibility of the polymer backbone. 22 The T g values of the HBPIs were observed at 302, 298, and 290 C for 1, 2, and 4, respectively. Interestingly, this trend of T g values is similar to the order of thermal stability observed in TGA.…”

Section: Analyses Of Molecular Weight Distribution and Inherent Vismentioning

confidence: 92%

“…As the composition of temperature resistant imide units is one of the important factors affecting the thermal stability of PIs, it will be better to compare linear and HBPIs with analogous polymer backbone. The rigid PMDA-and TPA-based linear PIs: P-1(unsubstituted), P-2 (methyl-TPA), and P-3 (adamantoyl-TPA) are thermally stable up to 460, 310, and 299 C respectively, whereas, synthesized TPA and PMDA-based hyperbranched polyimide (HBPI-1) is thermally stable at 523 C. 18,24 In the same way, other linear PIs with p-phenoxy substituted TPA with BTDA, FDA, and OPDA backbone (P-6,8,14) are reported to be thermally stable at 471-485 C. 22 The credit of improved thermal stability in comparison to linear equivalents goes to the highly branched structure of synthesized HBPIs. 25,26 Some of the reported HBPIs exhibited thermal stability above 500 C, 26 comparable with 1, 2, and 4, except 3 with the aliphatic hexafluoroisopropylidene group in the main PI backbone.…”

Section: Analyses Of Molecular Weight Distribution and Inherent Vismentioning

confidence: 94%

“…The higher polydispersity index in the range 2-3 in comparison to the linear polymers (1.5-1.6) is attributed to the presence of hyperbranched and linear units with various functional groups on its surface. 21,22 3.4 | Thermal properties of HBPIs, 1-4…”

Section: Analyses Of Molecular Weight Distribution and Inherent Vismentioning

confidence: 99%

“…data of synthesized HBPIs and reported linear polyimides 22,[30][31][32] [Color table can be viewed at wileyonlinelibrary. com]…”

Section: T a B L E 4 Comparison Of Thermalmentioning

confidence: 99%

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Thermally resistant, mechanically stable, and processable triphenylamine‐based hyperbranched copolyimides

Khalid

Siddiqi

Park

2020

J of Applied Polymer Sci

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A trifunctional, triamine 4-(4-aminophenoxy)-4 0 ,4 00-diamino triphenylamine (A) was successfully synthesized by N-arylation in the presence of cesium fluoride, followed by catalytic reduction. A series of aromatic tree-shaped hyperbranched copolyimides (HBPIs, 1-4) was fruitfully synthesized by onepot polycondensation of a newly synthesized triamine monomer (A), difunctional monomer 4,4 0-dianiline, 4,4 0-oxydianiline (ODA) and a series of aromatic dianhydride monomers. The appropriate molar ratio of triamine, ODA to the dianhydride monomer B is 1:1:2.5 for HBPIs synthesis using the A 2 A 3 B 5 type copolymerization approach. The synthesized HBPIs exhibited a moderate number-average molecular weight (25,700-28,400 g/mol) and polydispersity in the range 2.6-3.0 as revealed by gel permeation chromatography measurement. The oxidative thermal degradation analyses of the HBPIs showed that the synthesized materials are thermally stable up to 500 C and glass transition temperature in the range 290-302 C. The elongation at break was found in the range 4.8%-8.1% as revealed by tensile measurement. Besides, good thermal stability the HBPIs exhibited excellent flow, appreciable organosolubility, easy processability, and noticeable mechanical stability, thus suggesting their use as thermally resistant, protective coatings for various devices and outdoor environment in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Analyses Of Molecular Weight Distribution and Inherent Vismentioning

confidence: 92%

Section: Analyses Of Molecular Weight Distribution and Inherent Vismentioning

confidence: 94%

Section: Analyses Of Molecular Weight Distribution and Inherent Vismentioning

confidence: 99%

“…data of synthesized HBPIs and reported linear polyimides 22,[30][31][32] [Color table can be viewed at wileyonlinelibrary. com]…”

Section: T a B L E 4 Comparison Of Thermalmentioning

confidence: 99%

See 3 more Smart Citations

Thermally resistant, mechanically stable, and processable triphenylamine‐based hyperbranched copolyimides

Khalid

Siddiqi

Park

2020

J of Applied Polymer Sci

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Bromophenoxy Substitution Effect on Thermal and Opto‐Electronic Properties of Triphenylamine‐Based Co‐polyimides

et al. 2023

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The present study reported the synthesis of a series of 4,4'diamino-(4''-p-bromophenoxy)triphenylamine diamine 2 based co-polyimides (Br-TPA co-PIs (AÀ D))obtained via polycondensation of 2 with a series of dianhydrides. The nucleophilic N-arylation of the 4-(4-bromophenoxy)benzenamine followed by catalytic reduction was used to obtain 2. The synthesized Br-TPA coPIs were characterized by CHN elemental, and FTIR spectral analysis. The optical and redox active properties were examined by the ultraviolet/visible (UV/vis) absorption, photoluminescence emission spectral analysis and cyclic voltammetry respectively. From which it is obvious that Br-TPA coPIs are optical transparent, and deep blue light emissive in the range 465-472 nm with a quantum efficiency of 4.6-7.3 %. The lifetime decay was calculated from the time correlation single photon counting (TCSPC) and found in the range 11.7-12.9 nS. The evaluation of thermal properties via thermogravimetric analysis (TGA) revealed excellent thermal stability of synthesized materials in the range 426-476 °C. The excellent thermal properties, appreciable processability, shallow HOMO levels (À 4.70 eV), low onset oxidation (E onset = 0.296 V) and long-lived excited states (12.94 nS decay time) evidently depicted their optoelectronic character, suggesting their use as efficient light emitting layer in light emitting diiodes.

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4-quinolin-8-yloxy Linked Triphenylamine Based Polyimides: Blue Light Emissive and Potential Hole-Transport Materials

et al. 2017

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A series of fluorescent donor- acceptor (D-A) alternating copolyimides (P1, P2, P3 and P4) with 4-quinolin-8-yloxy linked triphenylamine main polymer chain have been synthesized by conventional polycondensation. All the synthesized co-polyimides were characterized by elemental, gel permeation chromatography and FTIR spectral analysis. These newly prepared PIs possess HOMO energy levels in range of - 4.74 to - 4.78 eV and have medium optical band gaps. The photoluminescence spectral analysis revealed blue to violet emission with appreciable efficiency with lower onset oxidation potentials suitable for the facile hole injection materials. All the photophysical and electrochemical properties were also explored in context of effect of the pendant 4- quinolin-8-yloxy, indicating suitable combination of donor (TPA) on one hand and imide and pendant as acceptor on both ends.Graphical Abstract.

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Electroactive Polyimides: Synthesis, Characterization and Photophysics

Cited by 4 publications

References 14 publications

Thermally resistant, mechanically stable, and processable triphenylamine‐based hyperbranched copolyimides

Thermally resistant, mechanically stable, and processable triphenylamine‐based hyperbranched copolyimides

Bromophenoxy Substitution Effect on Thermal and Opto‐Electronic Properties of Triphenylamine‐Based Co‐polyimides

4-quinolin-8-yloxy Linked Triphenylamine Based Polyimides: Blue Light Emissive and Potential Hole-Transport Materials

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