X-ray diffraction study of the crystalline structure of aromatic polymides

Kazaryan, L.G.; Tsvankin, D.Ya.; Гинзбург, Б. М.; Tuichiev, Sh.; Korzhavin, L.N.; Frenkel, S.Ya.

doi:10.1016/0032-3950(72)90183-9

Cited by 68 publications

(39 citation statements)

References 2 publications

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“…7. 18 Compared with the N 2 -imidized samples, the air-imidized samples showed a significantly weaker 002 peak, indicating a lower degree of crystallinity and/or poorer crystal alignment. Table II lists the density of the vapor-deposited polyimide imidized under different conditions.…”

Section: Resultsmentioning

confidence: 93%

Temperature dependence of the properties of vapor-deposited polyimide

Tsai

Blanton

Harding

et al. 2003

Journal of Applied Physics

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The Young's modulus and helium gas permeability of vapor-deposited poly͑4,4Ј-oxydiphenylenepyromellitimide͒ were measured at cryogenic and elevated temperatures ͑10-573 K͒. The Young's modulus decreased with increasing temperature from 5.5 GPa at 10 K to 1.8 GPa at 573 K. The temperature dependency of the permeability followed the Arrhenius' relationship, with different activation energy for permeation for samples imidized under different conditions. The effect of the imidization conditions on the permeation properties could be explained in terms of morphology/crystallinity as determined by x-ray diffraction techniques. Imidizing in air instead of nitrogen increased the permeability while lowering the activation energy for permeation and crystallinity. Imidizing at higher heating rates ͑in nitrogen͒ resulted in higher permeability, lower activation energy for permeation, and larger and fewer crystallites with better-aligned lattice planes.

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Section: Resultsmentioning

confidence: 93%

Temperature dependence of the properties of vapor-deposited polyimide

Tsai

Blanton

Harding

et al. 2003

Journal of Applied Physics

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“…Thus, ratios of peak intensities, Af 8 (6) Therefore,(cos 2 ();), (cos 2 ()i), and (cos 2 ()k), can be determined from eq 3 and 6 as follows:…”

Section: Ratios Of Peak Intensities A; a I• Andmentioning

confidence: 99%

Evaluation of Molecular Orientation in Aromatic Polyimide Films by FT-IR Reflection Absorption Spectroscopy

Iida

Imamura

Liao

et al. 1996

Polym J

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A method for the quantitative evaluation of molecular orientation in organic film containing rigid parts has been developed. In the method, mean square of cosine of angle between normal to the substrate and transition dipole moment vectors due to molecular vibration was evaluated by means of comparing infrared reflection-absorption (RA) spectrum of a film with the transmission spectrum of the same molecule in the unoriented bulk state such as in KBr pellets. Application of the method to the polyimide films prepared by vapor deposition polymerization showed that both the molecular chain axis and zigzag plane of the chain were nearly parallel to the substrate, and that the pyromellitimide and the phenylene ring were inclined to the substrate. As the heating temperature for the imidization rose, both the chain axis and the zigzag plane showed a tendency to be parallel to the substrate, the phenylene ring showed a tendency to cline, but the orientation of the pyromellitimide did not vary. The various factors that influence the accuracy of the orientation analysis were also discussed.

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“…The crystalline cell structures of these PIs were assigned as orthorhombic (α = β = γ = 90°) except for the monoclinic symmetry (α = 98.4°) of PMDA/TPE. The diffraction peaks were indexed on the basis of previous reports on fiber Xray diffraction [5,[7][8][9]. The lattice parameters of the a-, b-, and c-axes were quantitatively estimated because these PIs exhibit (00l) peaks corresponding to periodic structures along the main chains, as well as several (hk0) peaks corresponding to intermolecular ordering structures.…”

Section: Crystal Structures Of Pismentioning

confidence: 99%

“…The molecular aggregation structures of PIs have been mainly investigated by wide-angle X-ray diffraction (WAXD) [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Russell et al [13] reported that poly(4,4-oxidiphenylene pyromellitimide) (PMDA/ODA) films exhibited different aggregation structures ranging from amorphous to highly ordered crystalline depending on the film thickness and preparation conditions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pressure-induced Variations in the Crystalline Structures of Polyimides Having Flexible Linkages by Wide-Angle X-ray Diffraction

Muto

Fujiwara

Ishige

et al. 2020

J. Photopol. Sci. Technol.

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Pressure-induced variations in the crystalline structures of polyimides (PIs) that have flexible ether or thioether linkages along the main chain were analyzed by synchrotron wideangle X-ray diffraction at high pressures up to 2.0 GPa. The crystalline lattices of poly(4,4oxidiphenylene pyromellitimide) (PMDA/ODA) and poly(4,4'-diamino-diphenyl sulfide pyromellitimide) (PMDA/SDA) PIs that have one flexible linkage in their repeating unit showed negative linear compressibility along the main-chain direction (c-axis), with a large anisotropy in the compressibilities between the two interchain directions (a-and b-axes). In contrast, polyimides prepared from bis(4-aminophenyl) ether (PMDA/TPE) and 4,4'-bis(4aminophenoxy) biphenyl (PMDA/BAPB) that have two flexible linkages in their repeating units exhibited positive compressibility along the main-chain direction, with a small difference in compressibility between the interchain directions. The different compression behaviors of PI crystalline lattices can be explained by the intrinsic Λ-shaped conformation of PMDA/ODA and PMDA/SDA, specifically the rotational fluctuations of the phenyl groups of the diamine moiety that were induced by the applied pressure.

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X-ray diffraction study of the crystalline structure of aromatic polymides

Cited by 68 publications

References 2 publications

Temperature dependence of the properties of vapor-deposited polyimide

Temperature dependence of the properties of vapor-deposited polyimide

Evaluation of Molecular Orientation in Aromatic Polyimide Films by FT-IR Reflection Absorption Spectroscopy

Analysis of Pressure-induced Variations in the Crystalline Structures of Polyimides Having Flexible Linkages by Wide-Angle X-ray Diffraction

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