By combining poly(1,4-isoprene) (PI) with poly(ferrocenylmethyl methacrylate) (PFMMA) in a diblock copolymer structure by means of anionic polymerization we obtained narrowly dispersed PI-b-PFMMA copolymers with molecular weight ranging from 13000 to 62000 g/mol. The products were stable up to 228 °C, according to thermal gravimetry, which allowed us to further investigate their viscoelastic and X-ray scattering properties at elevated temperature by rheology and SAXS, respectively. For PI-b-PFMMA with total molecular weight 13400 g/mol a phase transition at 105 °C was identified leading to the segmental mixing at T > 105 °C and microphase separation at T <105 °C. The microphase separated morphology acquired hexahonally packed cylinder (HEX) microstructure in bulk. The explanation of the ordered HEX morphology was derived from a quantification of the thermodynamic immiscibility between PI and PFMMA segments via random phase approximation theory yielding generally accepted dependency of the Flory-Huggins interaction parameter (χ) on temperature.
- Ferrocenylmethyl methacrylate (FMMA)
- Flory-Huggins interaction parameter
- Order-disorder transition
- Diblock copolymers
- Order disorder transitions
Chernyy, S., Kirkensgaard, J. J. K., Bakke, A., Mortensen, K., & Almdal, K. (2017). On the properties of poly(isoprene-b-ferrocenylmethyl methacrylate) block copolymers. Polymer, 133, 129-136. https://doi.org/10.1016/j.polymer.2017.11.036