Preparation of monodisperse polymer samples by solubility difference method

✍ Scribed by Kamide, Kenji ;Miyazaki, Yukio ;Abe, Tatsuyuki

• Book ID: 104527147
• Publisher: Wiley (John Wiley & Sons)
• Year: 1981
• Tongue: English
• Weight: 631 KB
• Volume: 13
• Category: Article
• ISSN: 0007-1641
• DOI: 10.1002/pi.4980130408

✦ Synopsis

Abstract

An attempt was made to prepare the polymer fractions having extremely sharp molecular weight distribution (MWD), by using a successive solutional fractionation (SSF) method, in which a polymer‐lean phase was separated as a fraction from a polymer‐rich phase. For this purpose a large‐scale preparative SSF apparatus was constructed. Atactic polystyrene (PS) high‐density polyethylene (PE), and cellulose di‐ and tri‐acetates (CDA and CTA) were fractionated by SSF. The fractions isolated from a quasi‐binary mixture (polymer/solvent system) have the same MWD as that predicted by the computer simulation technique. Even under the conventional fractionation conditions (initial polymer volume fraction v^o^~p~ = ∼ 0.01, total number of fractions n~t~ = 10 ∼ 20) the fractions with the ratio of the weight to number‐average molecular weight M~w~/M~n~ less than 1.1 for PS, 1.2 for PE, 1.3 for CDA and 1.4 for CTA were obtained, with exception of a few initial fractions. The advantage of the SSF method was clarified over the conventional preparative methods such as gel permeation chromatography and the column fractionation method.