Optical properties of new aliphatic–aromatic co-polyimides

Jarząbek, Bożena; Schab‐Balcerzak, Ewa; Chamenko, T; Sęk, Danuta; Cisowski, J.; Volozhin, A I

doi:10.1016/s0022-3093(01)01130-9

Cited by 31 publications

(23 citation statements)

References 14 publications

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“…The shape of obtained curves is similar to the behavior proposed by Tauc for typical amorphous semiconductors [20,21], although the absorption level is lower than the one of the amorphous, inorganic thin films. These results are in agreement with literature data, according to which a lower absorption in the polymeric materials is due to a lower degree of bonding delocalization [22,23]. An absorption edge is a sharp discontinuity in the absorption spectrum when photon energy corresponds to the energy of an atom shell.…”

Section: Evaluation Of the Absorption Limits Of Psfq/cap Films: Transsupporting

confidence: 93%

<strong>Fundamental perspectives on development of conductive blends based on quaternized polysulfone: Optical and dielectric response</strong>

Filimon¹,

Dobos²

2017

Proceedings of the 21st International Electronic Conference on Synthetic Organic Chemistry

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Abstract:New blends based on ionic polysulfones for advanced applications, derived from quaternized polysulfone and cellulose acetate phthalate, were prepared. The optical and dielectric response was investigated according to chemical and microstructural aspects. All studied films develop two relaxation processes, i.e., γ and β relaxation, involving different enthalpy and entropy contributions induced by their chemical structures. Moreover, the electrical conductivity of the studied blends can be explained in terms of band conduction mechanisms through band gap representation. The outcomes highlight the electrical performances and importance of new polysulfone blends uses as good candidates for ionic exchange membranes in industrial applications.

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Section: Evaluation Of the Absorption Limits Of Psfq/cap Films: Transsupporting

confidence: 93%

<strong>Fundamental perspectives on development of conductive blends based on quaternized polysulfone: Optical and dielectric response</strong>

Filimon¹,

Dobos²

2017

Proceedings of the 21st International Electronic Conference on Synthetic Organic Chemistry

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“…Thus, the energy gaps (E G ) of the films were deduced from the linear approximation of the (aE) 1/2 ¼f(E) dependence, as presented in Figure 9b. This approach, typical for amorphous semiconductors, has also been applied to obtain the energy gaps of both amorphous freestanding polymer films [44][45][46] and thin films on glass. [47][48] The smallest values of the energy gap were found for polymers PI-I and PI-II, which indicates better conjugation in these PIs.…”

Section: Optical Propertiesmentioning

confidence: 99%

Physical, optical and gas transport properties of new processable polyimides and poly(amideimide)s obtained from 4,4′-[oxybis(4,1-phenylenethio)]dianiline and aromatic dianhydrides

Grabiec

Schab‐Balcerzak

Wolińska‐Grabczyk

et al. 2011

Polym J

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Aromatic diamine 4,4¢-[oxybis(4,1-phenylenethio)]dianiline and various dianhydrides with isopropylidene, hexafluoroisopropylidene, fluorenylidene diphenyl, ether, thioether and/or amide linkages were applied in a polycondensation reaction to obtain new processable polyimides and poly(amideimide)s (PIs). PIs were synthesized by the conventional two-step procedure of ring-opening polyaddition and subsequent thermal cyclic dehydration. The structures of the polymers were characterized with Fourier-transform infrared spectroscopy and elemental analysis. The thermal behaviors of the PIs were characterized with differential scanning calorimetry, thermogravimetric analysis and dynamic mechanical thermal analysis. The glass transition temperature (T g ) of the PIs were in the range of 175-298 1C and depended on the dianhydride used. The 5% weight loss temperatures were in the range of 423-515 1C, which shows the high thermal resistance characteristics of the PI. The optical absorption properties in the UV-visible range of the obtained polymers were studied in solution and in the solid state. The average refractive indices (n) of the PI films measured at the low absorption range were in the range of 1.96-1.50. The permeation properties of the PIs were studied for He, O 2 , N 2 and CO 2 at 6 atm, with a constant pressure/variable volume setup. The hexafluoroisopropylidene-based PI showed the largest permeability for all gases.

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“…30 Structural disorder defect resulting from different lengths and orientations of polymer chains seems to be responsible for the amorphous character of the absorption edge of many polymers. This approach used for amorphous semiconductors has been also applied by us earlier to obtain energy gaps for amorphous polymer foils 31 and thin films. 28 The energy gaps (E g ) of investigated films were determined from the linear approximation of (aÂE) 1/2 ¼f (E) dependence, known as the Tauc relation, 32 at the energy range E4E g .…”

Section: Photo-optical Propertiesmentioning

confidence: 99%

Photo-optical properties of poly(oxadiazole-imide)s containing naphthalene rings

Damaceanu

Rusu

Brumă

et al. 2010

Polym J

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Two series of poly(oxadiazole-imide)s based on naphthalene-containing anhydrides and aromatic diamines containing preformed oxadiazole rings have been synthesized and their properties studied and compared. One series contains four polymers: two of them are based on naphthalene-1,4,5,8-tetracarboxylic dianhydride and the other two are based on bis(ketonaphthalicanhydride). The other series contains four copolymers based on mixtures of these dianhydrides with hexafluoroisopropylidenediphthalic anhydride. The thermal stability of these polymers and copolymers and their photo-optical properties in solution and solid state have been investigated.

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Optical properties of new aliphatic–aromatic co-polyimides

Cited by 31 publications

References 14 publications

<strong>Fundamental perspectives on development of conductive blends based on quaternized polysulfone: Optical and dielectric response</strong>

<strong>Fundamental perspectives on development of conductive blends based on quaternized polysulfone: Optical and dielectric response</strong>

Physical, optical and gas transport properties of new processable polyimides and poly(amideimide)s obtained from 4,4′-[oxybis(4,1-phenylenethio)]dianiline and aromatic dianhydrides

Photo-optical properties of poly(oxadiazole-imide)s containing naphthalene rings

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