Propylene-ethylene Copolymer Filled Nanocomposites: Influence of Zn-ion Coating upon Nano-SiO2 on Structural, Thermal, and Dynamic Mechanical Properties
- 1 June 2006
- journal article
- research article
- Published by Taylor & Francis Ltd in Polymer-Plastics Technology and Engineering
- Vol. 45 (7), 815-820
- https://doi.org/10.1080/03602550600612105
Abstract
Propylene-ethylene copolymer (EP) nanocomposites based on nano-SiO2 with and without Zn-ion coating were developed by conventional melt blending technique in a sigma internal mixer. Two composites each with 2.5 wt% filler were developed. The first composite was made by melt blending EP with nano-SiO2 in a co-rotating sigma internal mixer. The second one was obtained by melt blending the same EP, but with Zn-ion coated nano-SiO2. In case of Zn-ion coated nano-SiO2 filled EP, wide-angle X-ray diffraction study (WAXD) showed a decrease in interplanar distance and lamellar polymer crystal size when compared to nano-SiO2 filled EP. Differential scanning calorimetric (DSC) results showed Zn-ion coated nano-SiO2 acting more as an effective nucleating agent than that of the nano-SiO2. Thermogravimetric analysis (TGA) results showed improved thermal stability for EP in the presence of both the nanofillers. However, the thermal stability of Zn-ion coated nano-SiO2 filled EP is higher than that of the nano-SiO2 filled EP. Scanning electron microscope (SEM) study reveals that the Zn-ion coated nano-SiO2 homogeneously distributed in the matrix, whereas nano-SiO2 forms chainlike aggregates in the matrix phase. Dynamic mechanical analysis (DMA) study indicates that both the fillers increase storage modulus, E′; this increment is more prominent in nano-SiO2 filled EP due to the formation of chain-type aggregates of nano-SiO2.Keywords
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