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Research Article

Kinetic evaluation of the stabilization efficiency of the phosphite and urea derivative based stabilizers against epoxy based stabilizers on the thermal degradation of plasticized poly (vinyl chloride)

Ayşe Pınar Tüzüm Demir

Usak University, Faculty of Engineering, Chemical Engineering Department, Usak, TR64200, Turkey

Keywords

Abstract



Poly (vinyl chloride) (PVC);


Epoxy stabilizers;


Phenyl stabilizers;


Plasticizer migration;


Thermal stability;


Element Method

Poly (vinyl chloride) (PVC) is difficult to process because of its low thermal stability. Therefore, stabilizers are used. Epoxidized vegetable oils are environmentally friendly stabilizers, but they degrade at high temperatures, causing the polymer to become brittle and discolored. Also, unreacted double bonds in it can reduce the compatibility between plasticizer and PVC, causing greater migration of plasticizer from PVC. This study focuses on the evaluation of the effect of phosphite and urea derivative stabilizers against epoxy stabilizers on the thermal degradation of PVC and plasticizer diffusion from PVC. Plastisols were prepared by mixing plasticizers (di-octyl terephthalate and di-2-ethyl-hexyl phthalate), primary, and secondary stabilizers (epoxidized soybean oil (EPSO), epoxidized linseed oil(ELO), tri-phenyl phosphite(TPP) and diphenyl urea(DPU)) into PVC. Plastigels were cured and thermally aged. Thermal degradation in terms of color changes, oxidation index, and polyene concentration was investigated by using colorimetry, Fourier Transform Infrared Spectroscopy (FTIR) and Ultraviole (UV)-visible spectroscopy, respectively. As a result, phosphite and urea derivative stabilizers provided better long-term stability than the EPSO. However, EPSO was more affected by the plasticizer migration than the others. An effort has been made in this study to shed light on the improvement of the thermal stability of PVC by means of non-toxic secondary stabilizers.

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01/01/2024 Best Paper Award: The winners of 2023 Best Paper Award of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Author Awards section.


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2023 Reviewer Awards:

Please, visit Reviewer Awards section for the winners of the 2022 RESM reviewer awards.



2023 Best Paper Award:

The paper authored by Ferzan Fidan, Naim Aslan, Mümin Mehmet Koç entitled as “Morpho-structural and compressive mechanical properties of graphene oxide reinforced hydroxyapatite scaffolds for bone tissue applications” is awarded.



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The paper authored by Ercan Işık, Ehsan Harirchian, Hüseyin Bilgin, Kirti Jadhav entitled as “The effect of material strength and discontinuity in RC structures according to different site-specific design spectra" is awarded.


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