Light-Color Soluble Polyimides Based on α,α′-Bis[4-(4-amino-2-trifluoromethylphenoxy)phenyl]-1,3-diisopropylbenzene and Aromatic Dianhydrides

Yang, Chin‐Ping; Chen, Yaping; Woo, Eamor M.; Li, Shu-Hsien

doi:10.1295/polymj.38.457

Cited by 11 publications

(2 citation statements)

References 14 publications

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“…In our continuous efforts to develop practical high- n polymers, sulfur-containing polyimides (PIs) attracted our attention. PIs are well-known for their excellent combined properties, especially their high thermal stability and inherent high refractive index. − Several PIs containing thioether linkages, either linear − or cyclic, , have been prepared in our laboratory. As reported recently, refractive indices as high as 1.76 at the wavelength of 632.8 nm and birefringences lower than 0.01 have been successfully achieved .…”

Section: Introductionmentioning

confidence: 99%

Highly Refractive and Transparent Polyimides Derived from 4,4‘-[m-Sulfonylbis(phenylenesulfanyl)]diphthalic Anhydride and Various Sulfur-Containing Aromatic Diamines

et al. 2007

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We have developed highly refractive and transparent polyimides (PIs). The PIs were prepared from a newly developed meta-substituted sulfonyl-bridged dianhydride, 4,4′-[m-sulfonylbis(phenylenesulfanyl)]diphthalic anhydride (DPSDA), and various sulfur-containing aromatic diamines, including 4,4′-thiobis [(pphenylenesulfanyl)aniline] (3SDA), 4,4′-sulfonylbis[(p-phenylenesulfanyl)aniline] (BADPS), 2,8-bis(p-aminophenylenesulfanyl)dibenzothiophene (APDBT), and 2,7-bis(p-aminophenylenesulfanyl)thianthrene (APTT), by employing a two-step polycondensation procedure. The PIs exhibited good thermal stabilities such as the relatively high glass-transition temperatures in the range of 177-206 °C and high initial thermal decomposition temperatures (T 5% ) exceeding 470 °C. The meta-substituted electron-withdrawing sulfonyl moiety endowed the PI films with good optical transparency. The optical transmittances of the PI films at 450 nm were higher than 85% for the thickness of approximately 10 µm. Furthermore, the flexible thioether linkages and sulfonyl moiety in the molecular chains of the PIs provided them with high refractive indices of 1.7162-1.7432, relatively small Abbe numbers of 14.1-14.8, and low birefringences of 0.0059-0.0065.

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Section: Introductionmentioning

confidence: 99%

Highly Refractive and Transparent Polyimides Derived from 4,4‘-[m-Sulfonylbis(phenylenesulfanyl)]diphthalic Anhydride and Various Sulfur-Containing Aromatic Diamines

et al. 2007

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“…As far as we know, in the literature, no study before ours discussed the reduction of optical losses by means of refractive index adjustment of the PI solar cell cover. The major issue of aromatic PIs comes from the limited transparencies at optical wavelengths [ 18 ] that restrict their utilization in photovoltaic devices. Related to this, it has been proven that incorporating fluorine groups [ 19 ] or alicyclic segments [ 20 ] of the PI backbone enhances transparency, while thermal resistance is almost undiminished.…”

Section: Introductionmentioning

confidence: 99%

Polyimide Layers with High Refractivity and Surface Wettability Adapted for Lowering Optical Losses in Solar Cells

Barzic¹,

Albu²,

Hulubei³

et al. 2022

Polymers

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The performance of photovoltaics with superstrate configuration is limited by the rigidity and low refractivity of a classical glass cover. In this work, two polyimides (PIs) and two copolyimides combined in the main chain cycloaliphatic moieties, aromatic sequences, chalcogen atoms, and having/lacking fluorine atoms, are proposed as shielding covers for solar cells. The samples containing small cycloaliphatic moieties displayed high transmittance above 80% at 550 nm. The refractive index values under changeable wavelengths and temperatures were shown to influence the magnitude of the reflection losses. At the sample interface with the transparent electrode, optical losses were reduced (~0.26%) in comparison to the classical glass (~0.97%). The samples with the best optical features were further subjected to a surface treatment to render the self-cleaning ability. For this, a new approach was used residing in irradiation with the diffuse coplanar surface barrier discharge (DCSBD), followed by spraying with a commercial substance. Scanning electron microscopy and atomic force microscopy scans show that the surface characteristics were changed after surface treatment, as indicated by the variations in root mean square roughness, surface area ratio, and surface bearing index values. The proposed PI covers diminish the optical losses caused by total internal reflection and soiling, owing to their adapted refractivity and superhydrophobic surfaces (contact angles > 150°), and open up new perspectives for modern photovoltaic technologies.

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Synthesis and characterization of organosoluble and transparent polyimides derived from trans‐1,2‐bis(3,4‐dicarboxyphenoxy)cyclohexane dianhydride

Zhao

Chen

Zhou

et al. 2015

J of Applied Polymer Sci

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A novel dianhydride, trans-1,2-bis(3,4-dicarboxyphenoxy)cyclohexane dianhydride (1,2-CHDPA), was prepared through aromatic nucleophilic substitution reaction of 4-nitrophthalonitrile with trans-cyclohexane-1,2-diol followed by hydrolysis and dehydration. A series of polyimides (PIs) were synthesized from one-step polycondensation of 1,2-CHDPA with several aromatic diamines, such as 2,2 0 -bis ( temperatures (T g s) of the polymers were higher than 1988C, and the 5% weight loss temperatures (T d5% s) were in the range of 424-4458C in nitrogen and 415-4308C in air, respectively. All the PIs were endowed with high solubility in common organic solvents and could be cast into tough and flexible films, which exhibited good mechanical properties with tensile strengths of 76-105 MPa, elongations at break of 4.7-7.6%, and tensile moduli of 1.9-2.6 GPa. In particular, the PI films showed excellent optical transparency in the visible region with the cut-off wavelengths of 369-375 nm owing to the introduction of trans-1,2-cyclohexane moiety into the main chain.

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Light-Color Soluble Polyimides Based on α,α′-Bis[4-(4-amino-2-trifluoromethylphenoxy)phenyl]-1,3-diisopropylbenzene and Aromatic Dianhydrides

Cited by 11 publications

References 14 publications

Highly Refractive and Transparent Polyimides Derived from 4,4‘-[m-Sulfonylbis(phenylenesulfanyl)]diphthalic Anhydride and Various Sulfur-Containing Aromatic Diamines

Highly Refractive and Transparent Polyimides Derived from 4,4‘-[m-Sulfonylbis(phenylenesulfanyl)]diphthalic Anhydride and Various Sulfur-Containing Aromatic Diamines

Polyimide Layers with High Refractivity and Surface Wettability Adapted for Lowering Optical Losses in Solar Cells

Synthesis and characterization of organosoluble and transparent polyimides derived from trans‐1,2‐bis(3,4‐dicarboxyphenoxy)cyclohexane dianhydride

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