نتایج جستجو برای: ziegler natta

تعداد نتایج: 1614  

Journal: :Siberian journal of life sciences and agriculture 2022

The authors have assessed the possibility of electrochemical synthesis a wide range reagents based on titanium trichloride as part work. Despite growing demand for and its derivatives, production technology this reagent has not been improved long period. Traditional technologies feature high environmental industrial hazards, process itself energy consumption complex hardware scheme. As prelimin...

Journal: Polyolefins Journal 2015

Several types of hybrid catalysts are made through mixing of 4th generation Ziegler-Natta (ZN) and (2-PhInd)2ZrCl2  metallocene catalysts using triethylaluminum (TEA) as coupling agent. Response surface methodology (RSM) is used to evaluate the interactive effects of different parameters including amounts of metallocene and TEA and temperature on metallocene loading. Analyzing the amounts of Al...

Journal: Polyolefins Journal 2014

Primary MgCl2.3.3EtOH adduct (PCT1) was prepared by melt quenching method and then submitted into a programmed thermal dealcoholation project using a fluidized bed reactor. During thermal dealcoholation program, different MgCl2.nEtOH support samples with n= 3.0, 2.7, 2.4, and 2.1 were selected and named as PCT2 to PCT5, respectively. Structural analysis of the support samples showed a significa...

Journal: :Journal of Applied Polymer Science 2023

Linear low-density polyethylene (LLDPE) materials may contain components, which are soluble at room temperature. These influence physical properties or raise concerns for end-users and regulatory bodies because LLDPE is widely used food packaging. Due to the nonpolar amorphous nature of temperature part LLDPE, its molecular characterization with common methods polyolefin analysis, such as Tempe...

Ahmad Ramazani S.A., Ali Dashti

A new model based on a combination of the polymeric multigrain and multilayer models has been developed to predict the polymerization rate, particle growth, morphology, effective parameters on broadening of the molecular weight distribution, number and weight average of the molecular weight, isotacticity index and bulk density of polymer. Mathematical correlations and the kinetics used in t...

Journal: :Chemcatchem 2022

Strict morphological control over growing polymer particles is an indispensable requirement in many catalytic olefin polymerization processes. In catalysts with mechanically stronger supports, e. g., polymerization-grade silicas, the emergence of extensive cracks via sectioning fragmentation mechanism requires severe stress build-up polymerizing catalyst particle. Here, we report on three facto...

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