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Novel synthesis of triblock PDMS-PS-PDMS copolymers

✍ Scribed by Jonathan R. Sargent; William P. Weber

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
171 KB
Volume
38
Category
Article
ISSN
0887-624X

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✦ Synopsis

Benzyl 6-(2Ј-pentamethyldisiloxanyl ethyl)-ortho-tolyl ketone (I) was prepared by a ruthenium-catalyzed Murai reaction of benzyl ortho-tolyl ketone with vinyl pentamethyldisiloxane. The reaction of I with a mixture of styrene and a catalytic amount of picoline Cu(II) acetate yielded the telechelic polystyrene ␣,-bis(2-pentamethyl-disiloxanyl ethyl)polystyrene (III). The acid-catalyzed equilibration polymerization of octamethylcyclotetrasiloxane into the SiOOOSi bonds of telechelic III yielded the polydimethylsiloxane-polystyrene-polydimethylsiloxane triblock softhard-soft copolymer. The molecular weights of the copolymers were studied by 1 H NMR end-group analysis and gel permeation chromatography. The thermal properties and morphology of IV were examined by differential scanning calorimetry and transmission electron microscopy (TEM).

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