Stereospecific Polymerization of Isoprene |
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Page 55
Elena Ceaușescu. The polymerization rate of propylene ( which is equal to the propagation rate ) is expressed by the following equation : Rp = kp [ TiCl3 ] [ C3H6 ] [ Al ] ° The reaction is first order with respect to both monomer and ...
Elena Ceaușescu. The polymerization rate of propylene ( which is equal to the propagation rate ) is expressed by the following equation : Rp = kp [ TiCl3 ] [ C3H6 ] [ Al ] ° The reaction is first order with respect to both monomer and ...
Page 109
... rate of reaction was made in order to establish the conditions of synthesis of polymers at convenient reaction rates with the highest molecular weights and improved physico - mechanical properties . Experimental data showed that with ...
... rate of reaction was made in order to establish the conditions of synthesis of polymers at convenient reaction rates with the highest molecular weights and improved physico - mechanical properties . Experimental data showed that with ...
Page 129
... rate ; the termination reaction . In ionic coordination polymerizations the termination of the chain growth takes place by transfer reactions . The difficulties met in kinetic treatments of ionic or ... reaction rate and molecular weight.
... rate ; the termination reaction . In ionic coordination polymerizations the termination of the chain growth takes place by transfer reactions . The difficulties met in kinetic treatments of ionic or ... reaction rate and molecular weight.
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