Stereospecific Polymerization of Isoprene |
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Page 32
... mechanism . A particular class includes ethylene monomers easily polymerized ... coordination mechanisms ; anionic mechanisms : 1 classical anionic ... mechanisms B Ionic mechanisms 1.
... mechanism . A particular class includes ethylene monomers easily polymerized ... coordination mechanisms ; anionic mechanisms : 1 classical anionic ... mechanisms B Ionic mechanisms 1.
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... coordination mechanisms In the cationic coordination mechanism , the terminal atom of the growing chain is more electropositive than the counter - ion of the catalyst complex [ 133 ] . Monomers which more readily stabilize the carbonium ...
... coordination mechanisms In the cationic coordination mechanism , the terminal atom of the growing chain is more electropositive than the counter - ion of the catalyst complex [ 133 ] . Monomers which more readily stabilize the carbonium ...
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... coordination mechanism involving propagation on the transition metal - carbon bond . Thus , Breslow and Newburg [ 103 , 194 ] showed that with catalysts of the following type Cl Ti C2Hs Cl - Al C2H5 Cl a complex between the titanium and ...
... coordination mechanism involving propagation on the transition metal - carbon bond . Thus , Breslow and Newburg [ 103 , 194 ] showed that with catalysts of the following type Cl Ti C2Hs Cl - Al C2H5 Cl a complex between the titanium and ...
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