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Chin. Phys. B, 2020, Vol. 29(2): 023104    DOI: 10.1088/1674-1056/ab6312
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Thermodynamic and structural properties of polystyrene/C60 composites: A molecular dynamics study

Junsheng Yang(杨俊升)1, Ziliang Zhu(朱子亮)2, Duohui Huang(黄多辉)1, Qilong Cao(曹启龙)1
1 Computational Physics Key Laboratory of Sichuan Province, Yibin University, Yibin 644000, China;
2 Weifang University of Science and Technology, Shouguang 262700, China
Abstract  To tailor properties of polymer composites are very important for their applications. Very small concentrations of nanoparticles can significantly alter their physical characteristics. In this work, molecular dynamics simulations are performed to study the thermodynamic and structural properties of polystyrene/C60 (PS/C60) composites. The calculated densities, glass transition temperatures, and coefficient of thermal expansion of the bulk PS are in agreement with the experimental data available, implying that our calculations are reasonable. We find that the glass transition temperature Tg increases accordingly with an added concentration of C60 for PS/C60 composites. However, the self-diffusion coefficient D decreases with increase of addition of C60. For the volumetric coefficients of thermal expansion (CTE) of bulk PS and PS/C60 composites, it can be seen that the CTE increases with increasing content of C60 above Tg (rubbery region). However, the CTE decreases with increasing content of C60 below Tg (glassy region).
Keywords:  polystyrene/C60 composites      molecular dynamics      glass transition      diffusion  
Received:  11 September 2019      Revised:  29 November 2019      Accepted manuscript online: 
PACS:  31.15.xv (Molecular dynamics and other numerical methods)  
  65.80.-g (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)  
  65.40.De (Thermal expansion; thermomechanical effects)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11704329), the Scientific Research Fund of Sichuan Provincial Education Department of China (Grant No. 15ZB293), the Pre-Research Project of Yibin University of China (Grant No. 2019YY06), and the Open Research Fund of Computational Physics Key Laboratory of Sichuan Province at Yibin University of China (Grant No. JSWL2014KF02).
Corresponding Authors:  Junsheng Yang, Qilong Cao     E-mail:  yangjunsheng2005@163.com;qlcao@mail.ustc.edu.cn

Cite this article: 

Junsheng Yang(杨俊升), Ziliang Zhu(朱子亮), Duohui Huang(黄多辉), Qilong Cao(曹启龙) Thermodynamic and structural properties of polystyrene/C60 composites: A molecular dynamics study 2020 Chin. Phys. B 29 023104

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