Abstract
Research into the mechanism of the inifer process led to perfectly end functionalized (telechelic) linear or three-arm star polyisobutylenes (PIB)s. Recently a semicontinuous technique has been developed and is now routinely employed for the synthesis of these materials. The ingredients are fed into a stirred reactor and by controlling their input rates PIB telechelics with virtually theoretical Mn and Mw/Mn are harvested. The first intermediates that form are t-chlorine telechelic PIBs which can then be quantitatively converted to other well-defined telechelics, e.g., PIBs carrying olefin, alcohol, phenol, etc. end groups. PIB diols and triols are now available on a semicommercial scale in various molecular weights. Telechelic PIBs have been used for the preparation of new block copolymers and/or networks by a variety of techniques. For example, a combination of polymerization and coupling techniques have been employed for the synthesis of a new class of di- and triblock copolymers consisting of PIB and polyethylene glycol sequences. Thus phenol-ended PIBs were reacted with a slight stoichiometric excess of diisocyanates, and the resulting isocyanate-capped prepolymers were then reacted with commercially available polyethylene glycols. These hydrophobic/hydrophilic (amphiphilic) materials exhibit some unusual dilute solution properties.
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Kennedy, J. New Sequential Copolymers and Networks by a Combination of Techniques. Polym J 17, 29–35 (1985). https://doi.org/10.1295/polymj.17.29
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DOI: https://doi.org/10.1295/polymj.17.29
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