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Can I read Effect of Methyl Group Substitution in the Diamine and Copolymer Composition on Thermal Degradation of Copolyimides Based on 2,2-Bis(3,4-dicarboxyphenyl) Hexafluoropropane Dianhydride on EtoBox?
Effect of Methyl Group Substitution in the Diamine and Copolymer Composition on Thermal Degradation of Copolyimides Based on 2,2-Bis(3,4-dicarboxyphenyl) Hexafluoropropane Dianhydride by P.Santhana Gopala Krishnan; S Veeramani is a Materials Science article available to read on EtoBox.
What is Effect of Methyl Group Substitution in the Diamine and Copolymer Composition on Thermal Degradation of Copolyimides Based on 2,2-Bis(3,4-dicarboxyphenyl) Hexafluoropropane Dianhydride about?
Three series of linear aromatic copolyimides containing hexafluoro isopropylidine moieties (i.e., 6F) were synthesized by reacting 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) with various mole percents of (a) 1,3-phenylene diamine (mPDA) and 2,6-diamino toluene (DAT) (b) mPDA and 2,4,6-trimethyl-l,3-phenylene diamine (TMemPDA) and (c) DAT and TMemPDA in N-methyl-2-pyrrolidone (NMP). These copolyimides were characterized by inherent viscosity, GPC, DSC, XRD, and TGA. T g increased with increase in TMemPDA content in [6FDA+TMemPDA+mPDA] and [6FDA+TMemPDA+DAT] copolyimides and increase in DAT content in [6FDA+mPDA+DAT] copolyimide series. All the copolyimides were found to be amorphous. Activation energy was determined for the thermal degradation of these copolyimides using the Coats-Redfern equation and was found to follow first-order kinetics in air and nitrogen. CO 2 was the main decomposition product in air and CHF 3 in nitrogen atmosphere.
Who reads Effect of Methyl Group Substitution in the Diamine and Copolymer Composition on Thermal Degradation of Copolyimides Based on 2,2-Bis(3,4-dicarboxyphenyl) Hexafluoropropane Dianhydride?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- P.Santhana Gopala Krishnan; S Veeramani
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0141-3910)
- Published
- 2003
- Language
- EN
- Field
- Materials Science (Physical Sciences)