Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Zn-Ion Coated Structural $SiO_2$ Filled LDPE: Effects of Epoxy Resin Encapsulation

  • Reddy C. S. (Materials Science Centre, Indian Institute of Technology) ;
  • Das C. K. (Materials Science Centre, Indian Institute of Technology) ;
  • Agarwal K. (Defence Materials & Stores Research and Development establishment, (DMSRDE)) ;
  • Mathur G N. (Defence Materials & Stores Research and Development establishment, (DMSRDE))
  • Published : 2005.06.01
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Abstract

In the present work, a low-density polyethylene (LDPE) composite, filled with Zn-ion coated structural silica encapsulated with the diglycidyl ether of bisphenol-A (DGEBA), was synthesized using the conventional melt-blending technique in a sigma internal mixer. The catalytic activity of the Zn-ions (originating from the structural silica) towards the oxirane group (diglycidyl ether of bisphenol-A (DGEBA): encapsulating agent) was assessed by infrared spectroscopy. Two composites, each with a filler content of $2.5 wt\%$ were developed. The first one was obtained by melt blending the Zn-ion coated structural silica with LDPE in a co-rotating sigma internal mixer. The second one was obtained by melt blending the same LDPE, but with DGEBA encapsulated Zn-ion coated structural silica. Epoxy resin encapsulation of the Zn-ion coated structural silica resulted in its having good interfacial adhesion and a homogeneous dispersion in the polymer matrix. Furthermore, the encapsulation of epoxy resin over the Zn-ion coated structural silica showed improvements in both the mechanical and thermal properties, viz. a $33\%$ increase in the elastic modulus and a rise in the onset degradation temperature from 355 to $371^{\circ}C$, in comparison to the Zn-ion coated structural silica.

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