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sadrani--alaleh
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Manufacturing and Investigating of Nano carbon/Polyethylene Nanocomposites via In-situ Polymerization
, M.Sc. Thesis Sharif University of Technology ; Ramezani Saadatabdi, Ahmad (Supervisor)
Abstract
In this research UHMWPE/CB nanocomposites were prepared via in situ polymerization using Bi-supported Ziegler-Natta catalytic systems. Magnesium etoxide and carbon black were used as supports of catalyst. TiCl4 accompanied by triisobutyl aluminum and diisobutyl phthalate (DIBP) constituted Ziegler-Natta catalytic system. Preparation of catalyst and polymerization were done in slurry phase under the argon atmosphere. Then, structural, thermal and mechanical properties of produced nanocomposites with different CB content were evaluated by SEM, DSC, TGA, DMTA and tensile tests. Scanning Electron Microscopy (SEM) images also certified very good dispersion of CBs throughout PE matrix....
Preparation of UHMWPE/carbon black nanocomposites by in situ Ziegler–Natta catalyst and investigation of product thermo-mechanical properties
, Article Polymer Bulletin ; Volume 73, Issue 4 , 2016 , Pages 1085-1101 ; 01700839 (ISSN) ; Ramazani, S. A. A ; Khorshidiyeh, S. E ; Jafari Esfad, N ; Sharif University of Technology
2016
Abstract
A new bi-supported Ziegler–Natta catalyst was prepared successfully by supporting TiCl4 on the carbon black (CB) and magnesium dichloride. Then, this catalyst was used to prepare ultrahigh molecular weight polyethylene (UHMWPE) nanocomposites via in situ polymerization. The effects of difference molar ratios of triisobutylaluminum as activator to TiCl4, polymerization temperature, pressure of monomer and polymerization time on productivity of the catalyst were studied. The maximum activity was obtained at [Al]/[Ti] = 121:1. Increasing monomer pressure raised catalyst activity. Increasing temperature to 60 °C increased the polymerization yield; however, the higher temperature decreased the...