Cycloolefin addition polymerization catalyst system and application thereof
An addition polymerization and catalyst technology, applied in the field of cycloolefin addition polymerization catalyst systems, can solve the problems of high polymer melting temperature, expensive cocatalysts, and difficult polymer characterization and processing.
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Embodiment 1
[0038] In a dry 100 ml polymerization flask, add 10 ml of toluene, 2 g of norbornene, and 2 ml of MMAO (2 M). After stirring at room temperature for 10 minutes, add the zero-valent palladium catalyst [(Ph) 3 P] 4 Pd(0) 1.4 mg, 0.5 ml dichloromethane solution. The polymerization reaction is 30 minutes. After stopping the stirring, pour into 100 ml of 1% hydrochloric acid ethanol solution, white polymer precipitates, filter, and vacuum dry at 50 ℃ for 24 hours to obtain 650 mg of polynorbornene. The obtained polymer is insoluble in common organic solvents, and its molecular weight cannot be measured.
Embodiment 2
[0040] In a dry 100 ml polymerization flask, add 10 ml of toluene, 2.6 g of dicyclopentadiene, and 2 ml of MMAO (2 M). After stirring at room temperature for 10 minutes, add the zero-valent palladium catalyst [(Ph) 3 P] 4 Pd(0) 1.4 mg, 0.5 ml dichloromethane solution. The polymerization reaction is 30 minutes. After the stirring was stopped, poured into 100 ml of 1% hydrochloric acid ethanol solution, white polymer precipitated, filtered and dried under vacuum at 50°C for 24 hours to obtain 870 mg of polynorbornene. The obtained polymer is insoluble in common organic solvents, and its molecular weight cannot be measured.
Embodiment 3
[0042] In a dry 100 ml polymerization flask, add 10 ml of toluene, 2.4 g of 5-vinylnorbornene, and 2 ml of MMAO (2 M). After stirring at room temperature for 10 minutes, add zero-valent palladium catalyst [(Ph) 3 P] 4 Pd(0) 1.4 mg, 0.5 ml dichloromethane solution. The polymerization reaction is 30 minutes. After the stirring was stopped, poured into 100 ml of 1% hydrochloric acid ethanol solution, white polymer precipitated, filtered and dried under vacuum at 50°C for 24 hours to obtain 50 mg of polynorbornene. The obtained polymer is dissolved in toluene, tetrahydrofuran and other solvents. High temperature GPC test results in molecular weight Mn=51000 and PDI=1.68.
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