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A comparative study between the modified and unmodified nanosilica to fine tune the morphological and mechanical properties of a model low-density polyethylene (LDPE) – ethylene vinyl acetate copolymer (EVA) thermoplastic elastomer blend system is explored in this article. The nanosilica particles were melt-blended with the LDPE/EVA system at 1.5, 3, and 5 wt % loadings through the variation of the sequence of addition. The blends were compression molded, and their morphological and mechanical properties were evaluated. The incorporation of mSiO2 produced a drastic improvement of Young’s modulus (up to 60%) as compared to the control blend. The morphological studies clearly indicated that modified silica had a homogeneous dispersion in the bi-component polymer matrix leading to strengthening of silica-polymer interface. Interestingly, after modification the sequence did not play a major role in affecting the morphology of this system. Overall, although the properties of the unmodified nanosilica filled blends are strong functions of the sequence of addition, but, interestingly, the properties of the modified nanosilica filled blends do not depend much on the preparation procedure.

Morphological and Mechanical Properties of LDPE/EVA Based TPE: Effect of both Modified and Unmodified Nanosilica