Blended block copolymer composition
A technology of block copolymer and diblock copolymer, applied in the field of self-assembled block copolymer, can solve the problems of orientation control of block copolymer and difficulty of long-range ordering, etc.
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Embodiment 1
[0056] Example 1: Preparation of hydroxyl-terminated polyethylene brushes
[0057]Cyclohexane (1500 g) was added in a 2 liter glass reactor under nitrogen atmosphere. Styrene (50.34 g) was then added to the reactor via cannula. The contents of the reactor were then heated to 40°C. A solution of sec-butyllithium (19.18 g) diluted at 0.32M in cyclohexane was then rapidly added to the reactor via cannula, causing the contents of the reactor to turn yellow. The contents of the reactor were stirred for 30 minutes. The contents of the reactor were then cooled to 30°C. Ethylene oxide (0.73 g) was then transferred to the reactor. The contents of the reactor were stirred for 15 minutes. Then 20 mL of a 1.4 M solution of HCl in methanol was added to the reactor. The polymer in the reactor was then isolated by precipitation in isopropanol at a ratio of 500 mL polymer solution / 1250 mL isopropanol. The resulting precipitate was then filtered and dried overnight in a vacuum oven at...
Embodiment 2
[0058] Embodiment 2: prepare PMMA-b-PTMSMMA diblock copolymer
[0059] Tetrahydrofuran ("THF") (226 g) was added in a 500 mL 3-neck round bottom reactor under an argon atmosphere. THF was then cooled to -78°C in the reactor. A 0.36M solution of sec-butyllithium in cyclohexane was then titrated into the reactor contents until the reactor contents exhibited a solid pale yellow color. The contents of the reactor were then warmed and held at 30° C. until the color of the contents had completely disappeared (approximately 10-15 minutes). 1,1-Diphenylethylene (0.110 g) diluted in cyclohexane (14.308 g) was then transferred to the reactor via cannula. The contents of the reactor were then cooled to -78°C. Sec-butyl lithium (0.62 g) diluted at 0.60 M in cyclohexane (0.62 g) was then rapidly added to the reactor via cannula, causing the contents of the reactor to turn a deep ruby red. The contents of the reactor were stirred for 15 minutes. Methyl methacrylate (11.8 g) in cycl...
Embodiment 3
[0060] Embodiment 3: prepare PMMA-b-PTMSMMA diblock copolymer
[0061] Tetrahydrofuran ("THF") (198 g) was added in a 500 mL 3-neck round bottom reactor under an argon atmosphere. THF was then cooled to -78°C in the reactor. A 0.36M solution of sec-butyllithium in cyclohexane was then titrated into the reactor contents until the reactor contents exhibited a solid pale yellow color. The contents of the reactor were then warmed and held at 30° C. until the color of the contents had completely disappeared (approximately 10-15 minutes). 1,1-Diphenylethylene (0.135 g) diluted in cyclohexane (5.099 g) was then transferred to the reactor via cannula. The contents of the reactor were then cooled to -78°C. Sec-butyl lithium (0.92 g) diluted at 0.60 M in cyclohexane (0.92 g) was then rapidly added to the reactor via cannula, causing the contents of the reactor to turn a deep ruby red. The contents of the reactor were stirred for 10 minutes. Methyl methacrylate (11.85 g) in cycl...
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