Infrared spectral absorption study of the formation kinetics of polypyromellitimide (PPMI)

Laius, L. A.; Bessonov, M.I.; Kallistova, Ye.V.; Adrova, N.A.; Florinskii, F.S.

doi:10.1016/s0032-3950(68)80056-5

Cited by 4 publications

(1 citation statement)

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“…polyimide, respectively [165,199]. This implies that the polymer and perhaps the dye moieties [200][201].…”

Section: Uv-vis Absorptionmentioning

confidence: 99%

Synthesis and characterization of novel nonlinear optical polyimide

Ren¹

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Nonlinear optical (NLO) polymers have attracted extensive attention because of their potential applications in integrated optical devices such as optical switching, frequency conversion and high-speed electro-optic (EO) devices. However, the stability and optical loss of currently used polymers limit their applications. It is very important to develop NLO polymers with better transparency and higher stability without sacrificing other properties. This study focused on the development of new side-chain NLO polyimides based on the novel fluoronitroaryl diaminoazobenzene chromophores and polyimide/silicon composites. The effects of the fluorine and the fluorine position in the chromophores on the structures and properties of the chromophores and polyimides were studied. The influences of the silicon network on the properties of the composite films were also investigated. Two novel fluorinated diaminoazobenzene chromophore monomers and their nonfluorinated analogues, which can be used for synthesis of side-chain NLO polyimide, were successfully synthesized. The new fluorinated diaminoazobenzene chromophore monomers have very good thermal stability and large hyperpolarizability. It was found that the incorporation of fluorine into the chromophore can lead to higher thermal stability. The fluorine position can lead to the different maximum absorption wavelength Xmax and thermal stability. Three series of novel NLO polyimides based on the fluorinated diaminoazobenzene chromophores and their analogue were successfully synthesized. All NLO polyimides possess high thermal stability, excellent transparency (km^: 298.5-355 nm) and large xix

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“…polyimide, respectively [165,199]. This implies that the polymer and perhaps the dye moieties [200][201].…”

Section: Uv-vis Absorptionmentioning

confidence: 99%

Synthesis and characterization of novel nonlinear optical polyimide

Ren¹

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Miscible polybenzimidazole blends with a benzophenone‐based polyimide

Guerra¹,

Williams²,

Karasz³

et al. 1988

J Polym Sci B Polym Phys

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Miscible blends of the aromatic polybenzimidazole, poly(2,2(m‐phenylene)‐5,5′‐benzimidazole) (PBI), and the aromatic polyimide formed from 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride and 3,3′‐diaminobenzophenone (LaRC TPI) have been prepared. Blends with PBI were prepared in N,N‐dimethylacetamide solution starting with either the polyamic acid or a 95% imidized form of LaRC TPI; the blend was then precipitated into water or cast as films. The mixture was then imidized thermally to obtain PBI/LaRC TPI blends. Evidence for miscibility was obtained in the form of single composition dependent Tg's intermediate between those of the component polymers and single tan δ dynamic mechanical relaxation peaks. The IR spectra displayed shifts in the NH stretching band, thereby providing evidence for specific interactions related to the miscibility of these two polymers.

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Comparison of different methods for determining the imidization degree of polyimide fibers

Yang

Liu

et al. 2015

Chin J Polym Sci

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Infrared spectral absorption study of the formation kinetics of polypyromellitimide (PPMI)

Cited by 4 publications

References 1 publication

Synthesis and characterization of novel nonlinear optical polyimide

Synthesis and characterization of novel nonlinear optical polyimide

Miscible polybenzimidazole blends with a benzophenone‐based polyimide

Comparison of different methods for determining the imidization degree of polyimide fibers

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