Stability Efficiencies of POSS and Microalgae Extracts on the Durability of Ethylene-Propylene-Diene Monomer Based Hybrids.

Traian Zaharescu,Carmen Mateescu

doi:10.3390/polym14010187

Abstract

The EPDM (ethylene-propylene-diene monomer) hybrids with improved thermal and radiation strengths containing 1 and 5 phr of polyhedral oligomeric silsesquioxane (vinyl-POSS, Ov-POSS) and/or 2 phr of microalgae (Chlorella vulgaris (CV) and Spirulina platensis (SP)) powders were investigated in respect to their thermal stability after γ-irradiation. The material durability under accelerated degradation was qualified by chemiluminescence and gelation, which prove the contribution of inorganic filler and microalgae extracts on the increase of hybrid thermal stability, as well as the interaction between added components (POSS and CV or SP). The activation energies and the durabilities under accelerated degradation were calculated, indicating their suitable usage as appropriate materials in various applications. The reported results indicate the improvement effect of both microalgal powders on the oxidation strength, but the contribution of Spirulina platensis grabs attention on its efficient effects upon the prevention of degradation under accelerated aging conditions. The thermal performances of the tested EPDM based hybrids are remarkably ameliorated, if the certain formulation includes Ov-POSS (5 phr) and Spirulina platensis (2 phr), certifying its suitability for the pertinent applications.

Highlights

As it may be noticed from the literature, the investigations on the extension of material life generate several papers presenting interesting faces of material properties
The inhibition of oxidation shown by the studied additives leads to a high-performances that are related by the material durability. This feature is attained due to the efficient restriction of oxidation and to the increase in the gel content by γ-irradiation. It means that the added compounds in the formulation of EPDM formulations bring about a useful improvement in the degradation resistance by the stimulation of the recombination of free radicals prior to their oxidation and their inactivation by scavenging inside the spatial configuration (Ov-polyhedral oligomeric silsesquioxane (POSS)) or by proton replacing
This paper presents the satisfactory improvement of thermal and radiochemical stabilities by the addition of some appropriate compounds, vinyl-POSS and microalgae: Chlorella vulgaris and Spirulina platensis

Summary

Introduction

As it may be noticed from the literature, the investigations on the extension of material life generate several papers presenting interesting faces of material properties. Suitable for general or specific applications, disregard the characterization of the material response to the action of various degradation conditions due to energetic transfer onto products. In the cases of polymer materials used in food preservation and handling, medical and pharmaceutical wear, engineering products, and automotive, aircraft, or rail materials, the stability studies provide valuable data for manufacturers and customers and create favorable conditions for the application of heat and radiation sterilizations. The considerable interest on the polyhedral oligomeric silsesquioxane (POSS) hybrids for the extension of the potential application areas of plastics manufacture is inspired by many papers [1,2,3] as the appropriate candidates for high performance materials. The outstanding benefit of POSS hybrids is its environmental friendliness because their presence does not generate hazardous by-products [7,8], and it has a certain availability for functionalization [9]

Methods

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Discussion

Conclusion