Influence of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymers on stereoselective catalysis in water
✍ Scribed by Kerstin Drexler; Roland Meisel; Ingrid Grassert; Eckhard Paetzold; Hans Fuhrmann; Günther Oehme
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 89 KB
- Volume
- 201
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Suzuki reaction under phase transfer conditions: 15 mmol phenylboronic acid, 13 mmol p-iodoanisole, 0.01 mmol PdCl 2 [Ph 2 P(CH 2 ) 4 SO 3 K] 2 , 45 mmol Na 2 CO 3 in toluene/ethanol/water = 15 : 15 : 15 ml with 400 mg of different block copolymers; at 78 8C
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A two-stage stable system of isotactic polypropylene-poly(ethylene oxide) blend, in which poly(ethylene oxide) can be permanent either in molten or in crystallized states in the temperature range from 280 to 327 K, was described. The behavior of that blend was explained in terms of fractionated crys
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Phase behavior of aqueous systems containing block copolymers of poly(ethylene oxide (PEO) and poly(propylene oxide) (PPO) was evaluated by building up temperature-concentration phase diagrams. We have studied bifunctional triblock copolymers (HO-PEO-PPO-PEO-OH) and monofunctional diblock copolymers