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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 47736 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Mousavi, Ali
- Abstract:
- Linear structure of polypropylene, which is a direct result of Ziegler-Natta catalysts, led to the melt strength of the polymer is low and it does not show hardness strain. This defect is cause to the use of polypropylene in some processes, such as thermoforming, making foam etc. are limited. A main methods to solve this defect are branching structure of the polymer. There are three general methods for this purpose, which are modified by chemical, electron beam irradiation and polymerization in the presence of metallocene catalyst. The first two methods that past processing, polypropylene branching using linear type is produced, while the third method branching occurs during polymerization. There is not considering to the possibility of direct measurements on branching samples taken from past processing. Can be used to modeling and simulation determine how changes in various parameters used in branching. The results of the simulations showed that by increasing the amount of branching monomer concentration increases. The effect of increasing the initiator concentration making the macroradicals by β-Scission molecules. It also reduces the molecular weight and on the other hand increases the probability of branching. The results showed there are good agreement between that the concentrations of initiator and monomer used in this study is the change in branching whit experimental results that have been investigated in previous studies. The use of high concentrations of initiator and monomer sequence and branching polymer leads to destruction
- Keywords:
- Branched Polypropylene ; Monte Carlo Method ; Melt Strength
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