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Recent Developments in Aromatic Polymer-Based Proton Exchange Membranes
Published in Anandhan Srinivasan, Selvakumar Murugesan, Arunjunai Raj Mahendran, Progress in Polymer Research for Biomedical, Energy and Specialty Applications, 2023
Arijit Ghorai, Susanta Banerjee
Miyatake et al. reported multiblock sulfonated poly(arylene ether)s by reacting m-terphenyl (MTP)-based hydrophobic oligomers with hydrophilic sulfonated blocks (Scheme 9.18) [95]. The membranes of these multiblock polymers were tough and transparent, and TEM images indicated phase segregated morphology. The sequence of the blocks and their compositions contributed towards the morphology as the domain sizes. As usual, the PC and WU exhibited an upsurge trend with the IEC. They reported that the MTP unit contributed towards higher PC [PC: 320 mS cm−1; IEC: 2.13 meq g−1] compared to their earlier polymer that having the same hydrophilic segment but prepared from altered hydrophobic (p-biphenyl) segment [PC: 200 mS cm−1, IEC: 1.69 meq g−1) under similar test conditions. However, this discussion does not talk much about the role of MTP as the polymers under comparison had much different IEC values.
Organic Small-Molecule Materials for Organic Light-Emitting Diodes
Published in Zhigang Rick Li, Organic Light-Emitting Materials and Devices, 2017
Shijian Su, Norman Herron, Hong Meng
Sasabe et al. reported a series of 3,3′-bicarbazole–based host materials, which are modified by phenyl (BCzPh, 417), TPA (BCzTPA, 418), tetraphenylmethane (BCzTPM, 419), and triphenylphosphine oxide (BCzPO, 420), respectively. It was reported that 3,3′-bicarbazole, a dimer of carbazole, has not only a high ET but also a small ΔEST of 0.46 eV [467]. Owing to the sterically twisted structures, BCz can greatly reduce host–host aggregation, which may cause excimer formation. The developed host materials have high ET around 2.87–2.91 eV, together with high fluorescent quantum yield of an 11 wt.% FIrpic-doped film in the range of 62–64%. When these compounds were used as host materials for FIrpic, OLEDs exhibited superior performance; for instance, BCzTPM exhibited high power efficiency of 45.5 lm/W (44.5 cd/A, EQE 19.6%) with an extremely low driving voltage at 3.1 V at 100 cd/m2[467]. They also reported a m-terphenyl modified carbazole host material CzTP (361). CzTP has an ET1 of 2.7 eV, which is 0.07 eV smaller than that of FIrpic (2.77 eV), the decrease of ET could be attributed to the extended π-conjugation of 3, 6-position on carbazole. However, it has been found that CzTP is still a good host for FIrpic, and the FIrpic-based OLED devices containing CzTP as a host showed maximum power efficiency of 55 lm/W [433].
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Published in Natan B. Vargaftik, Lev P. Filippov, Amin A. Tarzimanov, Evgenii E. Totskii, Yu. A. Gorshkov, Handbook of Thermal Conductivity of Liquids and Gases, 2020
Natan B. Vargaftik, Lev P. Filippov, Amin A. Tarzimanov, Evgenii E. Totskii, Yu. A. Gorshkov
1,3–Diphenyl benzene (m–terphenyl) C18H14. Table 27.2 shows the thermal conductivity values [331, 332], which are accurate to within 3 percent and may be fitted into the equation as follows: () λ⋅103=159−0.064T.
Imidazole derivatives for efficient organic light-emitting diodes
Published in Journal of Information Display, 2020
Shaofeng Ye, Shaoqing Zhuang, Biao Pan, Runda Guo, Lei Wang
1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene TPBI has been recognized as a useful electron transporter and as a host material for fluorescent and phosphorescent dopants because of its good electron mobility (≈10−5 cm2 V−1 s−1) and large HOMO–LUMO energy gap (≈3.5 eV) for confining charge carriers and excitons in the EML. TPBI-Cz and TPBI-Da were based on the TPBI core and were functionalized with hole-transporting moieties (Cz or diphenylamine). Both the LUMO level and the triplet energies were almost equal to those of TPBI [109]. The green PhOLEDs achieved 48 and 60 cd A−1 CE values (46 and 70 lm W−1 PE values). The hybrids BICz-1-BICz-4 Cz-substituted through different linking spacers or linking topologies showed bipolar properties [110]. BICz-2 and BICz-3, with an m-terphenyl unit, exhibited blueshifts to BICz-1 and BICz-4. Their EL efficiencies followed the order of BICz-3 (70.2 cd A−1 CE and 73.4 lm W−1 PE) > BICz-2 > BICz-1 ≈ BICz-4.
3D-VAT printing of nanocomposites by photopolymerisation processes using amino-meta-terphenyls as visible light-absorbing photoinitiators
Published in Virtual and Physical Prototyping, 2023
Filip Petko, Emilia Hola, Magdalena Jankowska, Alicja Gruchała-Hałat, Joanna Ortyl
The cyclic voltammetry was used to determine the reduction and oxidation potentials of m-terphenyl derivatives. Cyclic voltammogram were recorded using an Electrochemical Analyzer M161 and an Electrode Stand M164 (MTM-ANKO, Poland). The following components were used for the measurements: platinum disk as the working electrode, silver chloride (Ag/AgCl) as the reference electrode and tetrabutylammonium hexafluorophosphate in acetonitrile (0.1 M, Sigma-Aldrich) as a supporting electrolyte. The determined potentials were recalculated relative to the saturated calomel electrode (SCE).
Chemical and physical aspects of recent bent-shaped liquid crystals exhibiting chiral and achiral mesophases
Published in Liquid Crystals, 2022
Supreet Kaur, Vidhika Punjani, Neelam Yadav, Abinash Barthakur, Anshika Baghla, Surajit Dhara, Santanu Kumar Pal
In 1999, Shen et al. reported the first appearance of the nematic phase in bent-core molecules without Schiff’s base units [66]. The compound 2’-nitro-m-terphenyl-4,4”-diyl bisbenzoate (Structure 1) exhibited a nematic phase of ~ 20°C along with the B1 mesophase.