Melt extensional properties and orientation behaviors of polypropylene/layered silicate nanocomposites
- Melt extensional properties and orientation behaviors of polypropylene/layered silicate nanocomposites
- 구종민; 김종현; 왕기현; 정인재
- Issue Date
- Journal of polymer science Part B, Polymer physics
- VOL 43, NO 2, 158-167
- Polypropylene-layered silicate nanocomposites consisting of three components-pure polypropylene, maleated polypropylene, and organically modified silicate-were prepared by the melt-intercalation method to investigate melt-extensional properties such as melt strength, neck-in test, and orientation behavior. The nanocomposites showed an enhanced tensile modulus, enhanced storage modulus, much enhanced melt tension, and reduced neck-in during the melt processing as compared with neat polymer. The uniaxial drawing induced the silicate surface to align parallel to the sheet surface. The c and a* axes of the polypropylene crystals were bimodally oriented to the flow direction, and the b axes were oriented to the thickness direction. The bimodal orientation of the polypropylene crystal was enhanced with the concentration of silicates.
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