| OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE Tg |
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| 引用本文： | Shu-ying Shang Xue-bang Wu Jia-peng Shui Zhen-gang Zhu. OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE Tg[J]. 高分子科学, 2007, 0(6): 629-633 |
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| 作者姓名： | Shu-ying Shang Xue-bang Wu Jia-peng Shui Zhen-gang Zhu |
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| 作者单位： | Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, China |
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| 基金项目： | 国家自然科学基金 , 中国科学院知识创新工程项目 |
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| 摘 要： | In this paper two different kinds of dynamic mechanical techniques(inversed torsion pendulum and energy dissipation apparatus)were used to study the dynamic behavior of atactic monodisperse polystyrene above glass transition. The plots of energy dissipation versus temperature were presented for two atactic polystyrene samples.An apparent energy dissipation peak occurred above T_g in each plot measured by the inversed torsion pendulum,and simultaneously the sample was found to flow assuredly at the moment.To exclude the influence of the flow and demonstrate there was a peak indeed above T_g,the energy dissipation apparatus was used,in which the samples were put into a cup.An obvious peak appeared, and it was in agreement with the peak observed by the inversed torsion pendulum.On basis of the results measured by the two kinds of apparatus,a conclusion is drawn that a peak occurrs above T_g,which gives a manifestation for the existence of the liquid-liquid transition.
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| 关 键 词： | 双液转移 聚苯乙烯 能量分布 化学分子 |
| 收稿时间： | 2006-11-08 |
| 修稿时间： | 2006-11-08 |
OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE Tg |
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| Shu-ying Shang,Xue-bang Wu,Jia-peng Shui,Zhen-gang Zhu. OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE Tg[J]. Chinese Journal of Polymer Science, 2007, 0(6): 629-633 |
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| Authors: | Shu-ying Shang Xue-bang Wu Jia-peng Shui Zhen-gang Zhu |
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| Abstract: | In this paper two different kinds of dynamic mechanical techniques (inversed torsion pendulum and energy dissipation apparatus) were used to study the dynamic behavior of atactic monodisperse polystyrene above glass transition.The plots of energy dissipation versus temperature were presented for two atactic polystyrene samples. An apparent energy dissipation peak occurred above Tg in each plot measured by the inversed torsion pendulum, and simultaneously the sample was found to flow assuredly at the moment. To exclude the influence of the flow and demonstrate there was a peak indeed above Tg, the energy dissipation apparatus was used, in which the samples were put into a cup. An obvious peak appeared,and it was in agreement with the peak observed by the inversed torsion pendulum. On basis of the results measured by the two kinds of apparatus, a conclusion is drawn that a peak occurrs above Tg, which gives a manifestation for the existence of the liquid-liquid transition. |
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| Keywords: | Liquid-liquid transition Polystyrene Energy dissipation apparatus. ABOVE MELT POLYSTYRENE PEAK ENERGY DISSIPATION manifestation existence glass transition basis results influence simultaneously sample flow moment peak plot temperature atactic polystyrene used |
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