International Journal of Plastics Technology

, Volume 22, Issue 2, pp 365–385 | Cite as

The effects of natural polyphenols and calcium-based thermal stabilizer on the rheological and thermal resistance behaviors of PVC

  • Hussein Ali ShnawaEmail author
  • Moayad Naeem Khalaf
  • Yousef Jahani
Research Article


With the aim to understand the effect of bio-polyphenols and calcium-based thermal stabilizer on the rheological and thermal degradation properties of polyvinyl chloride (PVC), this paper practically investigates the rheological and thermal degradation behaviors of PVC using melt rheology method. Thermal degradation study was carried out by monitoring the complex viscosity of PVC using a parallel-plate rheometer run by time sweep mode at 215 °C. The presence of calcium into tannin structure after modification allows the later to have HCl scavenger ability which is considered as an essential property of most PVC thermal stabilizers. The thermal stability monitoring by time sweep rheology measurements was further corroborated by dynamic rheological data, indicating that the increase in loading value of tannin–calcium into PVC from 1 to 3 part per hundred of PVC resin resulted in a notable enhancement of the PVC storage modulus and complex viscosity due to the increased thermal stability, stable chemical structure and a higher level of polymeric chain entanglements. The rheological parameters obtained by frequency sweep at 165 °C in terms of storage and loss moduli and damping factor proved simultaneously that the PVC formulations with tannin–calcium exhibit an obvious improvement in the rheological properties which were comparable to that of PVC stabilized with Reapak B-NT/7060, an industrial-type thermal stabilizer. The results obtained indicated a promising correlation between the thermal stabilization performance of tannin–calcium as a new and fully bio-based thermal stabilizer and the rheological properties of PVC.


PVC Bio-based stabilizer Polyphenol–calcium derivative Rheological properties Melt thermal stability 



The authors gratefully acknowledge Dr. M. Nekomenesh, Director of Iran Polymer and Petrochemical Institute (IPPI), and Dr. G. Naderi, the Head of International Relationship in this institute, for their large support and assistance during the period of Ph.D. research. The authors also express their deep appreciations to Eng. Mohsen Asil Rahimi, Eng. Hammed Hosseini and Mr. Hasan Hasani for their help during samples preparation and for providing the ultimate analysis results.


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Copyright information

© Central Institute of Plastics Engineering & Technology 2018

Authors and Affiliations

  • Hussein Ali Shnawa
    • 1
    Email author
  • Moayad Naeem Khalaf
    • 2
  • Yousef Jahani
    • 3
  1. 1.Polymer Research CenterUniversity of BasrahBasrahIraq
  2. 2.Department of Chemistry, College of ScienceUniversity of BasrahBasrahIraq
  3. 3.Department of Plastics, Faculty of ProcessingIran Polymer and Petrochemical InstituteTehranIslamic Republic of Iran

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