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Anionic Ring-Opening Polymerization of a Germanium-Bridged [1]Ferrocenophane: Synthesis and Morphology of Well-Defined Polyferrocenylgermane Homopolymers and Block Copolymers

✍ Scribed by Nga Sze Ieong; Ian Manners

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
420 KB
Volume
210
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Well‐defined poly(ferrocenyldimethylgermane) homopolymers PFDMG [$\overline M _{\rm n} $ = 18 800–33 700, degree of polymerization ($\overline {DP} _{\rm n} $) = 66–117, polydispersity index (PDI) = 1.02–1.05] and polyisoprene‐block‐poly(ferrocenyldimethylgermane) diblock copolymers (PI~x~‐b‐PFDMG~y~, for 6, x/y = 359:23, volume fraction, ϕ~PFDMG~ = 0.14, PDI = 1.04; for 7, x/y = 337:56, ϕ~PFDMG~ = 0.29, PDI = 1.04) have been prepared by anionic ring‐opening polymerization. The polymer morphology and thermal transition behaviour of PFDMG 5 ($\overline M _{\rm n} $ = 18 800, $\overline {DP} _{\rm n} $ = 66, PDI = 1.02) have been investigated by wide‐angle X‐ray scattering (WAXS) and differential scanning calorimetry (DSC), respectively. Both studies suggest that PFDMG 5 possesses similar crystallization behaviour to its Group 14 analogue, poly(ferrocenyldimethylsilane). Transmission electron microscopy (TEM) images of the solid state thin films of the diblock copolymers 6 (ϕ~PFDMG~ = 0.14) and 7 (ϕ~PFDMG~ = 0.29) show microphase separated structures of spherical or cylindrical PFDMG domains in a PI matrix respectively. Furthermore, these morphologies can be preserved after selective plasma etching of the PI block.

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