Synthesis and Characterization of High Temperature Polyimides from Bicyclic Dianhydrides
| Autor: | Issifu I. Harruna, Ernest V. Pascoe |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
chemistry.chemical_classification
Thermogravimetric analysis Polymers and Plastics Bicyclic molecule Chemistry Ether General Chemistry Polymer chemistry.chemical_compound Differential scanning calorimetry Monomer Polycyclic compound Polymer chemistry Materials Chemistry Ceramics and Composites Organic chemistry Polyimide |
| Zdroj: | Journal of Macromolecular Science, Part A. 40:915-932 |
| ISSN: | 1520-5738 1060-1325 |
| DOI: | 10.1081/ma-120023527 |
| Popis: | Polyimides were synthesized from bicylic dianhydrides and diamines. The bicyclic monomers used were bicyclo[2.2.2]oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride (BCDA), 1,4,7,8‐tetrabromobicyclo[2.2.2]oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride, and 1,4,7,8‐tetrachlorobicyclo[2.2.2]oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride. The diamines used were benzidine, 4,4′‐diaminodiphenyl ether, 4,4′‐(hexafluoroisopropylidene)dianiline and 4,4′‐(1,4‐phenylenedioxy)dianiline. Each dianhydride was polycondensed with each of the diamines in N‐methyl pyrrolidinone (NMP) at elevated temperatures. The polymers were characterized by means of IR and 13C nuclear magnetic resonance (NMR) spectroscopy, solubility and thermal analysis such as differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Thermogravimetric analysis studies indicate that the polymers were all stable to above 320°C. Most of the polymers were found to be soluble in highly polar solvents such as dimethyl sulfoxide (DMSO)... |
| Databáze: | OpenAIRE |
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