A kind of cycloolefin addition polymerization catalyst system and its application
A catalyst and main catalyst technology, applied in the field of catalysts, can solve the problems of high melting temperature of polymers, complex operation of the catalytic process, and expensive co-catalysts
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Embodiment 1
[0038] In a dry 100 ml polymerization bottle, add 10 ml of toluene, 2 g of norbornene, 2 ml of MMAO (2 M), stir at room temperature for 10 minutes, then add a zero-valent palladium catalyst [(Ph) 3 P] 4 Pd(0) 1.4 mg, dichloromethane 0.5 ml solution. Polymerization was carried out for 30 minutes. After the stirring was stopped, pour it into 100 ml of 1% ethanol hydrochloric acid solution, a white polymer precipitated, filtered, and vacuum-dried at 50°C for 24 hours to obtain 650 mg of polynorbornene. The resulting polymer was insoluble in common organic solvents, and its molecular weight could not be determined.
Embodiment 2
[0040] In a dry 100 ml polymerization bottle, add 10 ml of toluene, 2.6 g of dicyclopentadiene, 2 ml of MMAO (2 M), stir at room temperature for 10 minutes, then add the zero-valent palladium catalyst [(Ph) 3 P] 4Pd(0) 1.4 mg, dichloromethane 0.5 ml solution. Polymerization was carried out for 30 minutes. After the stirring was stopped, it was poured into 100 ml of 1% hydrochloric acid ethanol solution, and a white polymer precipitated, filtered, and vacuum-dried at 50°C for 24 hours to obtain 870 mg of polynorbornene. The resulting polymer was insoluble in common organic solvents, and its molecular weight could not be determined.
Embodiment 3
[0042] In a dry 100 ml polymerization bottle, add 10 ml of toluene, 2.4 g of 5-vinyl norbornene, 2 ml of MMAO (2 M), stir at room temperature for 10 minutes, then add the zero-valent palladium catalyst [(Ph) 3 P] 4 Pd(0) 1.4 mg, dichloromethane 0.5 ml solution. Polymerization was carried out for 30 minutes. After the stirring was stopped, pour it into 100 ml of 1% ethanol hydrochloric acid solution, a white polymer precipitated, filtered, and vacuum dried at 50°C for 24 hours to obtain 50 mg of polynorbornene. The obtained polymer is dissolved in solvents such as toluene and tetrahydrofuran. High temperature GPC test shows molecular weight Mn=51000, PDI=1.68.
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