Journal article
On the properties of poly(isoprene-b-ferrocenylmethyl methacrylate) block copolymers
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.
Language: | English |
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Year: | 2017 |
Pages: | 129-136 |
ISSN: | 18732291 and 00323861 |
Types: | Journal article |
DOI: | 10.1016/j.polymer.2017.11.036 |
ORCIDs: | Chernyy, Sergey , 0000-0001-6265-0314 , 0000-0002-8998-9390 and Almdal, Kristoffer |
Diblock copolymers Ferrocenylmethyl methacrylate (FMMA) Flory-Huggins interaction parameter Order disorder transitions Order-disorder transition Poly(1,4-isoprene) Rheology