OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T<sub>g</sub>

Shu-ying Shang Xue-bang Wu Jia-peng Shui Zhen-gang Zhu~() 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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OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T_g

Updated：2021-06-21

- OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T_g
- OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T_g
- 高分子科学（英文版） 2007年第6期页码：629-633
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  This work was supported by the National Natural Science Foundation of China（No.10174089）();Innovation Project of Chinese Academy of Sciences（No.044N121507）.()
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Shu-ying Shang Xue-bang Wu Jia-peng Shui Zhen-gang Zhu~() Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, 等. OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T_g[J]. 高分子科学（英文版）, 2007,(6):629-633.

Shu-ying Shang Xue-bang Wu Jia-peng Shui Zhen-gang Zhu~() Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, et al. OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T_g[J]. 2007,(6):629-633.
Shu-ying Shang Xue-bang Wu Jia-peng Shui Zhen-gang Zhu~() Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, 等. OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T_g[J]. 高分子科学（英文版）, 2007,(6):629-633. DOI：

Shu-ying Shang Xue-bang Wu Jia-peng Shui Zhen-gang Zhu~() Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, et al. OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T_g[J]. 2007,(6):629-633. DOI：

摘要

<,正,>,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.

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 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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OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE Tg

OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE Tg

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OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T_g

OBSERVATION OF ENERGY DISSIPATION PEAK IN POLYSTYRENE MELT ABOVE T_g