Mechanical property changes produced by the thermal cyclization of poly (acid) amides

Smirnova, V.Ye.; Laius, L. A.; Bessonov, M.I.; Bushin, S. V.; Garmonova, T.I.; Koton, M.M.; Skazka, V.S.; Shcherbakova, L.M.

doi:10.1016/0032-3950(75)90052-0

Cited by 18 publications

(2 citation statements)

References 7 publications

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“…Finally, in a study similar to the present research, viscosity, molecular weight as determined by sedimentation velocity, and selected tensile properties were reported for a soluble aromatic polyimide film as a function of cure temperature (37).…”

Section: ) A2cm_supporting

confidence: 64%

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_supporting

confidence: 64%

Characterization of a thermally imidized soluble polyimide film

Young

Davis

Chang

et al. 1990

J. Polym. Sci. A Polym. Chem.

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“…Films prepared from samples with inherent viscosities of greater than 1.0 were also tough and creasable and suffered only a minor temporary loss in these properties during the cure cycle. Quantitative studies in which tensile strength and elongation at break were monitored have given similar results [89]. The fluctuation in mechanical properties is caused by a fluctuation in molecular weight [67][68][69][70].…”

Section: Changes In Mechanical Properties and Molecular Weight Duringmentioning

confidence: 97%

Synthesis of aromatic polyimides from dianhydrides and diamines

Harris¹

1990

Polyimides

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High‐performance polymer films. III. Preparation and characterization

Khatua¹,

Maiti

2001

J of Applied Polymer Sci

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A series of polyimide and copolyimide films were prepared by film casting, drying, and thermal imidization from the respective precursor poly(amic acid) (PAA) and copoly(amic acid) solutions derived from two dianhydrides, pyromellitic dianhydride (PMDA) and 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride (BTDA), and two diamines, 4,4′‐oxydianiline (ODA) and a proprietary aromatic diamine (PD) as monomers. Depending on the solution's inherent viscosity value (molecular weight) and the nature of the polymer chains (derived from rigid or flexible monomers), precursor poly(amic acid) and copoly(amic acid) solution concentrations of 8–12% (w/w) were found to be suitable for the preparation of good quality polyimide/copolyimide films. The recovery of film toughness and creasability from the brittleness at the intermediate temperature of the cure cycle depended not only on the molecular weight of the precursor poly(amic acids)/copoly(amic acids) but also on their chain flexibility. The poly(amic acid) derived from both rigid dianhydride and diamine practically gave rise to a brittle film of polyimide even after curing to 360°C. The resulting polyimide and copolyimide films were compared with Du Pont's Kapton H film. The density of the films was in the range 1.39–1.42 g/cm3. The thickness of most of the films was in the range 20–30 μm. The HPF 3 film, based on PMDA–PD, appeared to be highly colored (reddish brown), and the HPF 2 film, based on BTDA–ODA, had the lightest yellow coloring among the films in this investigation, including Kapton H film. HPF 2, HPF 6, and HPF 8 films were more amorphous than the other films. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 976–988, 2001

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Mechanical property changes produced by the thermal cyclization of poly (acid) amides

Cited by 18 publications

References 7 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

High‐performance polymer films. III. Preparation and characterization

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