Effect of Conductive Fillers on the Cyclic Stress-Strain and Nano-Scale Free Volume Properties of Silicone Rubber

M.H. Abd-El Salam; S. El-Gamal; M. Mohsen; D.M. Abd El-Maqsoud

doi:10.1007/s10118-014-1428-7

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Effect of Conductive Fillers on the Cyclic Stress-Strain and Nano-Scale Free Volume Properties of Silicone Rubber

PAPER | Updated：2021-06-21

- Effect of Conductive Fillers on the Cyclic Stress-Strain and Nano-Scale Free Volume Properties of Silicone Rubber
- Chinese Journal of Polymer Science Vol. 32, Issue 5, Pages: 558-567(2014)
- Affiliations：
  
  Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt
  Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt
  Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt
- Author bio：
  
  *S. El-Gamal, E-mail: samyelgamal@gmail.com
- Funds：
- DOI：10.1007/s10118-014-1428-7
  CLC：
- Received：11 July 2013，
  
  Revised：2013-10-06，
  
  Accepted：09 October 2013，
  
  Published：2014-05
- Accepted：
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M.H. Abd-El Salam, S. El-Gamal, M. Mohsen, et al. Effect of Conductive Fillers on the Cyclic Stress-Strain and Nano-Scale Free Volume Properties of Silicone Rubber[J]. Chinese Journal of Polymer Science, 2014, 32(5): 558-567.
DOI：

M.H. Abd-El Salam, S. El-Gamal, M. Mohsen, et al. Effect of Conductive Fillers on the Cyclic Stress-Strain and Nano-Scale Free Volume Properties of Silicone Rubber[J]. Chinese Journal of Polymer Science, 2014, 32(5): 558-567. DOI： 10.1007/s10118-014-1428-7.

摘要

Abstract

The effect of carbon black (CB) and graphite (G) powders on the macroscopic and nano-scale free volume properties of silicone rubber based on poly(di-methylsiloxane) (PDMS) was studied through thermal and cyclic mechanical measurements

as well as with positron annihilation lifetime spectroscopy (PALS). The melting temperature of the composites (

) and the endothermic enthalpy of melting (Δ

) were estimated by differential scanning calorimetry (DSC).

and the degree of crystallinity (

) of PDMS composites were found to decrease with increasing the CB content. This can be explained due to the increase in physical cross-linking which results in a decrease in the crystallite thickness. Besides

was found to be dependent on the filler type. Cyclic stress-strain behavior of PDMS loaded with different contents of filler has been studied. Mullins ratio (

) was found to be dependent on the filler type and content. It was found that

increases with increasing the filler content due to the increase in physical cross-linking which results in a decrease in the size of free volume

as observed through a decrease of the

-Ps lifetime

measured by PALS. Moreover

the hysteresis in PDMS-CB composites was more pronounced than in PDMS-G composites. Furthermore

a correlation was established between the free volume

and the mechanical properties of PDMS composites containing different fillers. A negative correlation was observed between

and

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