Synthesis and properties of highly gas permeable poly(amide-imide)s
| Autor: | Nicola Avella, Detlev Fritsch |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
chemistry.chemical_classification
Condensation polymer Polymers and Plastics Organic Chemistry Triphenyl phosphite Polymer Condensed Matter Physics chemistry.chemical_compound Trimellitic anhydride chemistry Polymer chemistry Polyamide Materials Chemistry Lithium chloride Physical and Theoretical Chemistry Imide Tetrahydrofuran |
| Zdroj: | Macromolecular Chemistry and Physics. 197:701-714 |
| ISSN: | 1521-3935 1022-1352 |
| DOI: | 10.1002/macp.1996.021970224 |
| Popis: | Seven dicarboxylic acids containing one or two preformed imide rings were prepared by condensation of trimellitic anhydride with 3-amino-4-methylbenzoic acid or with the diamines 2,4,6-trimethyl-1,3-phenylenediamine, 3,3′-dimethoxybenzidine, 3,3′,5,5′-tetramethyl-benzidine, 3,3′-dimethyl-1,1′-binaphthalene or by condensation of 2,2-hexafluoroisopropylidenebis(phthalic acid anhydride) (6FDA) with 2 mol of 3-aminobenzoic acid or 3-amino-4-methylbenzoic acid. Polycondensation was performed directly in N-methyl-2-pyrrolidone (NMP)/triphenyl phosphite/lithium chloride with oxydianiline, 2,2-bis(4-aminophenyl)-perfluoropropane or 3,3′,5,5′-tetramethylbenzidine. All the resulting polymers are soluble in NMP, some in tetrahydrofuran (THF) and could be cast to transparent, flexible and tough films. The helium permeability as a probe for diffusivity improves with increasing fluorine content and non-linearity in the repeating unit. |
| Databáze: | OpenAIRE |
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