Preparation of copolymer of norbornene and maleic anhydride
A norbornene and maleic anhydride technology, which is applied in the field of preparation of norbornene and maleic anhydride copolymers, can solve the problems of less research on norbornene and maleic anhydride copolymerization, small molecular weight of copolymers, and alternating copolymers. low degree, etc., to achieve the effect of good catalytic effect, high degree of alternation, and good copolymerization reaction performance
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[0027] Example 1
[0028] Dissolve 0.01 mol of neodymium naphthenate in 20 ml of cyclohexane, add 0.005 mol of α,α'-bipyridine and 0.30 mol of triethyl aluminum to the above solution, keep the temperature in a water bath at 50°C for 30 minutes, and cool it down. Obtain the rare earth complex catalyst.
[0029] Add 0.024 moles of bicyclo[2,2,1]hept-2-ene and 0.024 moles of maleic anhydride into a 25ml nitrogen-filled single-mouth polymerization flask, and add 5ml of toluene to dissolve. Take 1ml of rare earth complex catalyst and inject the above mixture with a syringe. Put it in a constant temperature water tank and react at 80°C for 6 hours. The product was poured into a methanol solution containing 5% hydrochloric acid to precipitate the copolymer of norbornene and maleic anhydride. The precipitate was washed with methanol to neutrality and dried in vacuum. The reaction yield (based on the total amount of norbornene and maleic anhydride) was 90.0 %.
Example Embodiment
[0030] Example 2
[0031] Dissolve 0.03 mol of neodymium naphthenate in 30 ml of toluene, add 0.01 mol of α,α'-bipyridine and 0.20 mol of diethyl zinc to the above solution, keep the temperature in a water bath at 50°C for 15 minutes, and obtain rare earth after cooling. Complex catalyst.
[0032] Add 0.024 moles of 1-methylbicyclo[2,2,1]hept-2-ene and 0.024 moles of maleic anhydride into a 25ml nitrogen-filled single-mouth polymerization flask, and add 5ml of toluene to dissolve. Take 1.5ml of catalyst and inject the above mixture with a syringe. Put it in a constant temperature water tank and react at 70°C for 7 hours. The product was poured into a methanol solution containing 5% hydrochloric acid to precipitate the copolymer of norbornene and maleic anhydride. The precipitate was washed with methanol to neutrality and dried under vacuum. The reaction yield (based on the total amount of norbornene and maleic anhydride) was 92.1 %.
Example Embodiment
[0033] Example 3
[0034] Dissolve 0.01 mol of neodymium naphthenate in 20 ml of toluene, add 0.01 mol of α,α'-bipyridine and 2.50 mol of diethyl zinc to the above solution, keep the temperature in a water bath at 50°C for 15 minutes, and obtain rare earth after cooling. Complex catalyst.
[0035] Add 0.024 moles of 5-methylbicyclo[2,2,1]hept-2-ene and 0.024 moles of maleic anhydride into a 25ml nitrogen-filled single-mouth polymerization flask, and add 5ml of toluene to dissolve. Take 1ml of catalyst and inject the above mixture with a syringe. Put it in a constant temperature water tank and react at 70°C for 7 hours. The product was poured into a methanol solution containing 5% hydrochloric acid to precipitate the copolymer of norbornene and maleic anhydride. The precipitate was washed with methanol to neutrality and dried under vacuum. The reaction yield (based on the total amount of norbornene and maleic anhydride) was 75.3 %.
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