期刊
RSC ADVANCES
卷 4, 期 16, 页码 7959-7966出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra46582a
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资金
- Department of Science and Technology, New Delhi
- The council of Scientific and Industrial Research
- DST (FIST)
- UGC (SAP)
Polybenzoxazines are phenolic-like materials that possess dimensional and thermal stability, and they release no by-products during their polymerization. In this study, a new class of benzoxazine-containing monomers has been prepared from renewable resource (eugenol, a natural phenol obtained from clove oil), paraformaldehyde and various aromatic diamines. The structures of the monomers were supported by Fourier Transform Infrared (FT-IR), H-1-NMR and C-13-NMR spectral analysis, proving the existence of the benzoxazine ring containing eugenol moiety in its molecular structure. The monomers were polymerized/cured via ring-opening polymerization by heating as indicated by FT-IR and Differential Scanning Calorimetry (DSC). This is confirmed by the disappearance of the peaks due to oxazine ring (942 cm(-1)). The exothermic peak associated with curing was observed from 170 degrees C to 250 degrees C. The thermal and mechanical properties of the polybenzoxazines were investigated through thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The temperatures corresponding to 5% and 10% weight loss is from 240 to 295 degrees C and from 290 to 340 degrees C, respectively. The completely cured materials could achieve char yields up to 36.5% at 800 degrees C in nitrogen atmosphere. DMA revealed that the glass transition temperatures of PBz-SUL and PBz-PHE were higher than that of PBz-DDS and PBz-OXY.
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