Some specific features of cyclization of poly(o-esteramides) in the solid state

Slonimskii, G.L.; Vygodskii, Ya. S.; Gerashchenko, Z.V.; Nurmukhametov, F.N.; Аскадский, А.А.; Korshak, V.V.; Виноградова, С. В.; Belavtseva, Ye.M.

doi:10.1016/0032-3950(74)90486-9

Cited by 2 publications

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“…The general importance of polymer chain mobility in polyimide curing has been recognized for some time with respect to its role in mediating the cyclodehydration process. [30][31][32][33] The redissolving of a cured polyimide to facilitate new favorable backbone conformations for cyclodehydration has been found to allow further extents of cure and the reacquisition of the fast initial rate constants observed early in the first cure. 34 While not directly related, these studies show the importance of chain mobility in chemical transformation of the extremely rigid polyimide systems and thus support the plausibilty of chain mobility as a limiting factor in molecular weight extension in the solid state as well.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Properties of Highly Fluorinated Polyimides

Hougham¹,

Tesoro²,

Shaw³

1994

Macromolecules

229

197

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A series of polyimides was synthesized to facilitate the study of several structure/property relationships, including relative permittivity, moisture absorption, free volume, and viscoelastic transitions. This series was based on hexafluoroisopropylidene bis(phthalic anhydride) and various diamines, with the intention of having a number of fluorine/hydrogen and symmetric/asymmetric analog sets. Since several of the fluorinated diamines were exceptionally unreactive, a multistep polycondensation polymerization technique was developed to obtain materials of sufficient molecular weight for property evaluation. Effects of fluorine incorporation on the aforementioned properties are reported.

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Section: Resultsmentioning

confidence: 99%