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Synthesis and properties of polyimides derived from isomeric biphenyltetracarboxylic dianhydrides

Rozhanskii, I. ; Okuyama, K. ; Goto, K.

Polymer (Guilford), 2000, Vol.41 (19), p.7057-7065 [Periódico revisado por pares]

Oxford: Elsevier Ltd

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  • Título:
    Synthesis and properties of polyimides derived from isomeric biphenyltetracarboxylic dianhydrides
  • Autor: Rozhanskii, I. ; Okuyama, K. ; Goto, K.
  • Assuntos: Applied sciences ; Aromatic polyimides ; Biphenyltetracarboxylic dianhydrides ; Exact sciences and technology ; Organic polymers ; Physicochemistry of polymers ; Polycondensation ; Polymers with particular properties ; Preparation, kinetics, thermodynamics, mechanism and catalysts
  • É parte de: Polymer (Guilford), 2000, Vol.41 (19), p.7057-7065
  • Descrição: 2,2′,3,3′-Biphenyltetracarboxylic dianhydride (i-BPDA) was suggested as a monomer for the synthesis of soluble polyimides with high thermal stability, and an efficient method of its preparation has been developed. Polyimides derived from i-BPDA and aromatic diamines (i.e. 4,4′-oxydianiline, 2,2′-bis(trifluoromethyl)benzidine and 9,9′-fluorenylidene-4,4′-dianiline) showed high glass transition ( T g>330°C) and degradation ( T d5>550°C) temperatures, and were soluble in organic solvents (i.e. NMP, DMF, γ-butyrolacton, CHCl 3), although their mechanical properties were inferior to those of polyimides composed of semirigid 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA). Random copolymers, derived from i-BPDA and s-BPDA, retained superior mechanical properties of s-BPDA-based polyimides and showed improved solubilities, depending on the i-BPDA content. A regular increase of glass transition temperatures and a decrease of inherent viscosities of copolymers with increasing content of i-BPDA was observed, whereas the dielectric constants and degradation temperatures were found to be independent of the ratios of dianhydride units.
  • Editor: Oxford: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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