Loading...

Investigation Properties of Polyethylene/ Carbon Nanotube Nanocomposites Prepared Via in Situ Polymerization

Meschi Amoli, Behnam | 2010

586 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40466 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramazani Saadatabadi, Ahmad
  7. Abstract:
  8. In this research UHMWPE/MWCNT nanocomposites with different concentrations of nanotubes (0.5, 1.5, 2.5, 3.5 wt %) were prepared via in situ polymerization using a novel Bi-supported Ziegler-Natta catalytic systems. Magnesium etoxide and Multi wall carbon nanotubes functionalized by hydroxyl groups were used as supports of catalyst. TiCl4 accompanied by triethylaluminum constituted Ziegler-Natta catalytic system. Preparation of catalyst and polymerization were done in slurry phase under the argon atmosphere. Support of catalyst on MWCNT was investigated using Fourier Transform Infrared Spectroscopy (FTIR). The results confirmed interaction between catalyst and hydroxyl groups on the surface of nanotube. Scanning Electron Microscopy (SEM) images also certified very good dispersion of MWCNTs throughout PE matrix. Intrinsic viscosity measurements showed high molecular weight for produced samples which could also confirm with Melt Flow Index measurements. Crystallization behavior of samples was examined using Differential Scanning Calorimetry (DSC). Its results showed crystal content of samples increased significantly with addition of MWCNTs up to 2.5 wt%. The same results occurred for melting and crystallization temperatures. Thermogravimetric analysis (TGA) showed that addition of MWCNTs also improved all factors characterized thermal stability. The results obtained from tensile test reveal significant increases in ultimate tensile strength, yield stress and young modulus
  9. Keywords:
  10. Polyethylene ; In-situ Polymerization ; Carbon Nanotubes ; Ziegler-Natta Catalyst

 Digital Object List

 Bookmark

No TOC