The mechanism of formation and decomposition of polyimides

Nechayev, P.P.; Vygodskii, Ya. S.; Zaikov, G.Ye.; Виноградова, С. В.

doi:10.1016/0032-3950(76)90371-3

Cited by 36 publications

(9 citation statements)

References 23 publications

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“…In addition, I_ n for this polymer was shown to substantially decrease during solid phase imidization at 150° (36). This particLllar event was quantified by a UV-VIS spectral analysis of a 13 derivative of the newly formed amine (41).…”

Section: ) A2cm_mentioning

confidence: 99%

“…Thus, while we found no direct evidence of free amine end-groups in our infrared study, possibly because the amine region was obscured by bands already in the poly(amic acid) spectrum, other studies have been reported on the basis of this group. Nechayev noted that, in the solid phase, synthesis does not begin until the temperature is taken above 200°C (36).…”

Section: ) A2cm_mentioning

confidence: 99%

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Characterization of a thermally imidized soluble polyimide film

Young

Davis

Chang

et al. 1990

J. Polym. Sci. A Polym. Chem.

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A soluble aromatic poly (amic acid) film was converted to a soluble polyimide by staging at 25°C intervals to 325°C and characterized at each interval by several analytical methods. The behavior observed was consistent with an interpretation that a reduction occurred in molecular weight of the poly (amic acid) during the initial stages of cure before the ultimate molecular weight was achieved as a polyimide. This interpretation was supported by the results of solution viscosity, gel permeation chromatography, low angle laser light scattering photometry, and infrared spectroscopy analyses. The results of this study serve to increase our fundamental understanding of how polyimides are thermally formed from poly (amic acid)s.

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Section: ) A2cm_mentioning

confidence: 99%

Section: ) A2cm_mentioning

confidence: 99%

Characterization of a thermally imidized soluble polyimide film

Young

Davis

Chang

et al. 1990

J. Polym. Sci. A Polym. Chem.

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show abstract

“…The magnitude of the heat of reaction depends on the solvent's basicity. Thus, the equilibrium is shifted to the left and the product's molecular weight is lowered when the reaction temperature is increased [17]. Conversely, decreasing the reaction temperature results in a shift of equilibrium to the right and an increase in the molecular weight.…”

Section: Two-step Methods For Polyimide Synthesismentioning

confidence: 96%

“…It is highly likely that the true value of k5 is near zero, since o-carboxycarboxamide groups have been found to hydrolyse via the formation of anhydride intermediates [40]. Further verification for this route is found in the resistance of poly(amic acid) salts and poly(amic esters) to hydrolysis [17,37]. As discussed earlier, these polymers cannot form anhydride groups because of their lack of carboxyl protons.…”

Section: Effect Of Side Reactions On the Preparation Of Po/y( Amic Acmentioning

confidence: 96%

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Synthesis of aromatic polyimides from dianhydrides and diamines

Harris¹

1990

Polyimides

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Polyimides

Bryant

2006

Kirk-Othmer Encyclopedia of Chemical Technology

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Polyimides are a class of high performance polymers that contain an imide group, defined as an sp 3 nitrogen bonded to two adjacent carbonyls. This imide structure is most commonly found as part of a five or six membered ring. Aromatic polyimides are noted for their mechanical properties, chemical resistance and dielectric strength. They exist as thermoplastics and thermosets and are available in many formats. Polyimides are used as hot melt adhesives, matrix resins for composites, dielectric films, photoimageable coatings, flex circuits, foams, wire insulation, thin walled tubing, molding resins and high performance bushings and seals. Products that compete with polyimides for niche applications include aerospace epoxies (Dow, Ciba and Shell), cyanate resins (Dow), polysulfones (Solvay), filled polycarbonates and polyesters (Dow, Amoco and GE), polybenzimidazoles (Hoechst‐Celanese) and some high Tg filled phenolics. Although polyimides command a premium price, their versatility, reliability, and demonstrated performance makes them suitable use in high performance applications where failure and replacement costs are high.

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The mechanism of formation and decomposition of polyimides

Cited by 36 publications

References 23 publications

Characterization of a thermally imidized soluble polyimide film

Characterization of a thermally imidized soluble polyimide film

Synthesis of aromatic polyimides from dianhydrides and diamines

Polyimides

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