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采用ARES流变仪研究石墨烯不饱和聚酯的β松弛和改变
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The β-relaxation of poly (n-alkyl methacrylates) has been a research topic of interest for many years and it is important to study the shift and extent of the β-relaxation to understand its influence on mechanical properties. There has been much recent work to study the glass transition temperature change for graphene polymer nanocomposites such as graphene/PMMA. However, the influence of graphene on the β-relaxation of poly (n-alkyl methacrylates) has not been explored. Here we use an ARES Rheometer with a rectangular torsion fixture, to investigate the β-relaxation change of poly (ethylmethacrylate)/graphene oxide nanocomposites. The dynamic temperature ramp methodology ranged from -40 °C and 60 °C. Compared to the parallel plate experiment, rectangular torsion fixtures can avoid the slip of sample from the plates at low temperatures and reduce sample stiffness to give more accurate results. It was found that 0.12 v% graphene oxide can increase the β-relaxation temperature by 6 K but does not change the intensity and breadth of the β-relaxation. Interestingly, a 15 K increase in the glass transition temperature was also observed, which implies that graphene oxide can split glass transition and β-relaxations. |
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- 附件 1 : 采用ARES流变仪去研究石墨烯不饱和聚酯的β松弛的改变.pdf
2016-07-04 14:44:10, 299.23 K
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