A tubelike, naturally occurring halloysite clay mineral (HNTs) incorporated polyphosphazene (PPZ) elastomeric nanocomposites had been electron beam radiated and thermally treated for certain applications. To improve the dispersion of raw HNTs (H), an organosilane modifier had been exploited. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) technique were utilized for plausible interaction and intercalation. The efficiency of electron beam radiation over chemical initiation for intra and inter chain network formation within the resin was substantiated through oil and solvent resistance studies. Effective delay in mass transport as compared to the virgin elastomer was observed through thermal analysis. Color versions of one or more of the figures in the article can be found online at www.tandfonline.com/lpte.
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INTRODUCTIONElastomers are a class of polymeric material exhibiting high elastic behavior hence making them ideal for use in seals, sealants, gaskets, and shock absorbing applications. Development and commercialization of high performance thermosetting elastomers (both inorganic and organic) to satisfy the increasing demand for polymeric materials with wide range of thermal stability, modulus, and chemical resistance have drawn interest of industries as well as of scientific communities [1,2] . In this area, amidst polysiloxanes, poly(sulfur nitride), polycarbosilanes, etc.; inorganic elastomer like polyphosphazenes are of great importance since it can be fabricated with large variety of substituents giving rise to diverse physical and chemical properties generating nonburning, hydrophobic, film and fiber forming materials, photosensitive and electrical conductors or insulators, solvent, oil and hydraulic fluid-resistant elastomers, etc. [3] .Polyphosphazenes are high molecular weight, hybrid organic-inorganic polymers with a backbone chain of alternating phosphorus and nitrogen atoms and each phosphorus atom bearing two substituents can be optimized with a wide variety of side groups leading to development of high performance commercial elastomers, electro-optical glasses, ion-transport membranes, flame retardants, biomedical materials and many more [4] . Chemical and thermal stability along with the flexibility of the overall backbone chain are influenced mainly by the side groups.Among the versatile side groups, occupation of only one type of fluoroalkoxy side group upon each phosphorus atom makes the polymer nonburning, hydrophobic, nanocrystalline, film and fiber forming material. The polymer becomes a low-glass transition, hydrophobic, solvent, oil, and hydraulic fluidresistant elastomer if substituted by two or more fluoroalkoxy side groups. Mixed aryloxy derivatives produces non-burning, lowsmoke-forming elastomers for thermal and electrical insulations. Three different techniques like the ring-opening polymerization followed by macromolecular substitution approach, the cyclic trimer substitution followed by ring-opening polymerization approach and the condensation techniq...