Isoprene-butadiene bipolymer and preparation method thereof
A technology of isoprene and butadiene, applied in the field of polymer preparation, can solve the problem of not being able to meet multiple properties at the same time
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[0076] The invention provides a preparation method of a rare earth complex having a structure of formula I, comprising:
[0077] A1) Under anhydrous and oxygen-free conditions, react after mixing a ligand having a structure of formula V, an alkyllithium, and an organic solvent to obtain a first reaction mixture;
[0078] A2) performing a second reaction on the first mixture and the rare earth halide to obtain a second reaction mixture;
[0079] A3) performing a third reaction on the above-mentioned second reaction mixture with a substituent-containing compound to obtain a rare earth complex having a structure of formula I,
[0080]
[0081] Among them, R 1 Cyclopentadienyl and its derivatives having the structure of formula II, indenyl and its derivatives having the structure of formula III or fluorenyl and its derivatives having the structure of formula IV,
[0082]
[0083] R 2 , R 3 independently selected from hydrogen, methyl, ethyl, isopropyl, tert-butyl, phenyl...
Embodiment 1
[0212] Take 5ml of the toluene solution of catalyst combination 1, put it in a polymerization bottle that has been anhydrous and anaerobic, add 10mmol of butadiene monomer first, carry out the polymerization reaction at 25°C for 1 hour, and then add 10mmol of isoprene Monomer, binary copolymerization, continue the reaction at 25°C for 2 hours, add 2ml of ethanol solution with a volume concentration of 10% hydrochloric acid to terminate the polymerization reaction, pour the reaction solution into 100ml of methanol and settle to obtain butadiene-isoamyl Diene binary block copolymer; then the binary block copolymer obtained is placed in a vacuum oven and dried for 48 hours to obtain a dry constant weight butadiene-isoprene binary block copolymer, net weight 1.09 g. The total conversion rate is 90%. The calculated polymerization activity is 36.3kg·(mol Y h) –1 , with NMR spectroscopy ( 1 (H NMR) analysis obtains that the content of butadiene in the butadiene-isoprene binary bl...
Embodiment 33
[0220] Take 5ml of the toluene solution of Catalyst Combination 1, put it in a polymerization bottle that has been anhydrous and anaerobic, add 10mmol of isoprene monomer first, carry out the polymerization reaction of isoprene at 25°C for 2.5 hours, and then add 10 mmol of butadiene monomer, the binary copolymerization reaction was continued at 25° C. for 1 hour. Add 2ml of ethanol solution with a volume concentration of 10% hydrochloric acid to terminate the polymerization reaction, pour the reaction solution into 100ml of methanol for sedimentation, and obtain an isoprene-butadiene binary block copolymer; then place the obtained binary copolymer Dry in a vacuum drying oven for 48 hours to obtain a dry constant weight isoprene-butadiene binary block copolymer, with a net weight of 1.12 g. The total conversion rate was 91%. The calculated polymerization activity is 31.7kg·(mol Y h) –1 , with NMR spectroscopy ( 1 H NMR) analysis obtains that the content of isoprene in the ...
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