نتایج جستجو برای: propylene polymerization
تعداد نتایج: 36246 فیلتر نتایج به سال:
Catalysts and polymerization processes have evolved over the years. Such significant developments allowed producers to broaden range of polymer microstructure process productivity, thereby making it possible offer a wide end-use properties at reasonably low cost. However, these advantages in catalyst performance reactor operation require that we understand as much about broadest sense. In addit...
in this research we used heavy propylene tetramer (hpt) and a1c13 —bf3 (lewis acids) ascatalyst and ethanol, n-propanol and n-butanol as co-catalyst. using lewis acids as catalyst, thehpts form molecules with higher molecular weight. since the raw materials of the reaction are byproducts of other reactions, are not pure and contain various compounds with different m.w andalso different chemical...
A series of polyether-based diblock copolymers were synthesized by sequential organocatalytic ring-opening polymerization (ROP) either hexene oxide (HO) or octene (OO) as the first monomer with propylene (PO) second monomer. In addition, one triblock terpolymer OO, PO, and styrene (SO) was following same method. The ROP catalyzed triethyl borane (TEB)/(phosphazene base t-BuP2) eicosanol initiat...
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...
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