Thermal properties of bisitaconimide and bisbenzoxazine blends
| Autor: | Indra K. Varma, Jayashree Bijwe, Sini Nalakathu Kolanadiyil |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Cardanol Materials science Double bond Ether Condensed Matter Physics chemistry.chemical_compound Differential scanning calorimetry chemistry Chemical engineering Polymerization Polymer chemistry Thermal stability Physical and Theoretical Chemistry Fourier transform infrared spectroscopy Curing (chemistry) |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 116:427-434 |
| ISSN: | 1588-2926 1388-6150 |
| Popis: | Blends of cardanol-based bisbenzoxazine (BZc) and 4,4′-bisitaconimidodiphenyl ether (BIM) having nine different mass ratios (i.e. 100:0, 90:10, 75:25, 60:40, 50:50, 40:60, 25:75, 10:90 and 0:100) were prepared and their curing behaviour was studied by differential scanning calorimetry (DSC) and fourier transform infrared spectroscopy. A curing mechanism comprising two-steps: (1) homopolymerization and co-curing reaction of itaconimide with alkyl side chain double bonds of cardanol BZc at lower temperature (~443 K) and (2) ring-opening polymerization of oxazine at higher temperature (~453–483 K) has been proposed. The T g of the cured resin blends was determined by DSC and the increase in BIM content in the blend resulted in an increase in T g from 408 K BZc to 474 K BIM. Increase in bisitaconimide content resulted in improvement of char yield at 1,073 K as well as an increase in mass loss temperatures (5 and 10 %). Compared to BZc, the blends showed a higher thermal stability. The lap shear strength of these blends in metal–metal joints was investigated at 323, 523 and 573 K. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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