Stereospecific Polymerization of Isoprene |
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Page 160
... formed , depending on the presence or absence of the monomer during the preparation of the catalyst complex . Pre - formed Ziegler - Natta- type catalyst complexes were used in order to increase their catalytic activity , to reduce the ...
... formed , depending on the presence or absence of the monomer during the preparation of the catalyst complex . Pre - formed Ziegler - Natta- type catalyst complexes were used in order to increase their catalytic activity , to reduce the ...
Page 162
... formed in aromatic hydrocarbons , especially toluene and benzene , result in the formation of a polyisoprene with a Table 2 Effect of the nature of the preforming medium on isoprene polymerisation with TIBA + TiCl catalyst system ...
... formed in aromatic hydrocarbons , especially toluene and benzene , result in the formation of a polyisoprene with a Table 2 Effect of the nature of the preforming medium on isoprene polymerisation with TIBA + TiCl catalyst system ...
Page 205
... formed by crosslinking of the macromolecules within the latex particles . The assumption that the formation of crosslinked polymer would no longer take place in ... FORMED CATALYST COMPLEXES Mechanism of gel formation in cis-1,4-polyisoprene.
... formed by crosslinking of the macromolecules within the latex particles . The assumption that the formation of crosslinked polymer would no longer take place in ... FORMED CATALYST COMPLEXES Mechanism of gel formation in cis-1,4-polyisoprene.
Contents
Introduction | 3 |
Stereospecific catalysts | 17 |
Mechanisms of stereospecific polymerization | 29 |
Copyright | |
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5A molecular sieves acetylenic hydrocarbons active sites AIR3 Al/Ti molar ratio aluminium alkyl anionic antioxidants atoms butadiene carbonyl compounds catalyst components catalyst concentration cationic CH₂ chain characteristics Chem cis-1,4-polyisoprene cm³ isoprene/100 content of cis-1,4 conversion cyclopentadiene deactivating agent decreases dl/g double bond Effect electron donor elongation at break ethylene formation fraction of purity free radical gel content H H H hexane hexane fraction hydrocarbons impurities influence initiation intrinsic viscosity ionic isopentane isoprene fraction isoprene polymerization kgf/cm² kinetic macromolecular maximum mechanism microstructure mixture molecular sieves molecular weight monomer n-heptane NATTA nitrogen obtained olefins optimum oxidation oxygen paramagnetic paramagnetic centres physico-mechanical properties polyisoprene polymer polymer solution polymerization of isoprene polymerization rate polymerization reaction polymers prepared propagation purification reaction rate removal samples shown in Figure solvent stabilizers stereoregularity stereospecific polymerization synthesized Table TIBA TIBA/100 g isoprene titanium tetrachloride toluene transition metal triethylaluminium triisobutylaluminium volumetric flow rate Ziegler-Natta-type catalyst complexes