Title of article :
Nano-graphene/polyimide composites with extremely high rubbery plateau modulus Original Research Article
Author/Authors :
J. Longun، نويسنده , , J.O. Iroh، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
10
From page :
1823
To page :
1832
Abstract :
Nano-graphene sheets (NGS) were dispersed in a high performance polyimide (PI) matrix by in situ condensation polymerization. The viscoelastic behavior of PI and NGS/PI composite was investigated by using dynamic mechanical spectrometry (DMS) and extraordinary modulus enhancement was observed in the rubbery plateau region (>400 °C) compared to the glassy region (<400 °C). A modulus enhancement of 11,000%, 52,000% and 400,000% was obtained in the rubbery plateau region for NGS/PI composite at 1.18, 6.12 and 28.08 vol.%, respectively, compared to a modulus enhancement of 100%, 108% and 500%, respectively, in the glassy region. The disparity in the modulus enhancement between the glassy region and the rubbery plateau region is due to the pronounced stiffening effect of hard fillers in a soft and flexible matrix such as rubber. Wide-angle X-ray diffraction (WAXD) was used to study dispersion of nano-graphene in the PI matrix, and graphene aggregates containing up to 46 single graphene sheets were obtained at about 0.29 vol.%. WAXD pattern show the presence of graphitic peak at a diffraction angle of 26.5o. Raman spectroscopy show the presence of amorphous carbon (D band) and graphitic carbon (G band), at 1360 and 1537 cm−1, respectively.
Journal title :
Carbon
Serial Year :
2012
Journal title :
Carbon
Record number :
1123964
Link To Document :
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