Preparation and Characterization of Poly(trimethylene terephthalate)-Poly(ethylene oxide terephthalate) Segmented Copolymer/Multiwalled Carbon Nanotubes Composites by In Situ Polymerization

摘要

Poly(trimethylene terephthalate)-poly(ethylene oxide terephthalate) block copolymer (PTG)/multiwalled carbon nanotubes (MWCNTs) composites were prepared via in situ polymerization. To improve the dispersion of MWCNTs in the PTG matrix, the poly(ethylene glycol)-grafted multiwalled carbon nanotubes (MWCNT-PEG) were produced by the 'graft to' method. The transmission electron microscopy observation demonstrated that a homogeneous dispersion of MWCNT-PEG was obtained. As a consequence, the percolation threshold for the rheology was around 0.5 wt% and the conductivity was ～1 wt%, respectively. Differential scanning calorimetry and polarized optical microscopy results confirmed that MWCNT-PEG can act as an effective heterogeneous nucleating agent. Interestingly, the effects of MWCNT-PEG on crystallization and melting of the poly(ethylene oxide terephthalate) blocks were more pronounced than on those of the PTT blocks