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Öğe Fractionation of partially stereoregular poly(propylene oxide) from acetonitrile solution(Vch Publishers Inc, 1996) Çolak, Nureddin; Akgün, Abuzer; 0000-0002-3966-4483Partially stereoregular poly(propylene oxide) (PPO) samples synthesized using Pruitt-Bagett catalysts (PBC) were fractionated at 40 degrees C and 70 degrees C from acetonitrile solution by adding small portions of water. The formed polymer-rich phases were clear liquids except the first three fractions obtained at 40 degrees C; those were solids. The fractions were characterized with their viscosity average molecular masses and melting points. Results showed that the procedure described in the present report fractionates partially stereoregular PPO on the basis of molecular weight, independent of their tacticity.
