Ja. Massey et al., Solution characterization of the novel organometallic polymer poly(ferrocenyldimethylsilane), J POL SC PP, 38(23), 2000, pp. 3032-3041
A series of four well-defined poly(ferrocenyldimethylsilane) (PFS) samples
spanning a molecular weight range of approximately 10,000-100,000 g mol(-1)
was synthesized by the living anionic polymerization of dimethyl[1]silafer
rocenophane initiated with n-BuLi. The polymers possessed narrow polydisper
sities and were used to characterize the solution behavior of PFS in tetrah
ydrofuran (THF). The weight-average molecular weights (M-w) of the polymers
were determined by low-angle laser light scattering (LALLS), conventional
gel permeation chromatography (GPC), and GPC equipped with a triple detecto
r (refractive index, light scattering, and viscosity). The molecular weight
calculated by conventional GPC, with polystyrene standards, underestimated
the true value in comparison with LALLS and GPC with the triple detection
system. The Mark-Houwink parameter a for PFS in THF was 0.62 (k - 2.5 x 10(
-4)), which is indicative of fairly marginal polymer-solvent interactions.
The scaling exponent between the radius of gyration and M-w was 0.54, also
consistent with marginal polymer-solvent interactions for PFS in THF. (C) 2
000 John Wiley & Sons, Inc.