Stereospecific Polymerization of Isoprene |
From inside the book
Results 1-3 of 26
Page 112
... optimum molar ratio yielding polymers with high stereoregularity , molecular weight and degree of conversion . Experiments were carried out varying the Al / Ti molar ratio from 0.5 to 2. The catalyst concentration , 1 g TEA / 100 g ...
... optimum molar ratio yielding polymers with high stereoregularity , molecular weight and degree of conversion . Experiments were carried out varying the Al / Ti molar ratio from 0.5 to 2. The catalyst concentration , 1 g TEA / 100 g ...
Page 213
... optimum conversion which is lower than the maximum level attainable [ 50 ] . As previously indicated , the optimum conversion takes higher values in the presence of modified catalyst complexes . However , for economic reasons , the ...
... optimum conversion which is lower than the maximum level attainable [ 50 ] . As previously indicated , the optimum conversion takes higher values in the presence of modified catalyst complexes . However , for economic reasons , the ...
Page 246
... optimum size should therefore be found . The optimum concentration of dispersing agent depends in its turn on the phase ratio , the temperature , the pH of the medium and the stirring . High aqueous / organic phase ratios favour the ...
... optimum size should therefore be found . The optimum concentration of dispersing agent depends in its turn on the phase ratio , the temperature , the pH of the medium and the stirring . High aqueous / organic phase ratios favour the ...
Contents
Introduction | 3 |
Stereospecific catalysts | 17 |
Mechanisms of stereospecific polymerization | 29 |
Copyright | |
31 other sections not shown
Other editions - View all
Common terms and phrases
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