In-situ grafting of hyperbranched poly(ether ketone)s onto multiwalled carbon nanotubes via the A(3)+B-2 approach
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- In-situ grafting of hyperbranched poly(ether ketone)s onto multiwalled carbon nanotubes via the A(3)+B-2 approach
- Choi, Ja-Young; Oh, Se-Jin; Lee, Hwa-Jeong; Wang, David H.; Tan, Loon-Seng; Baek, Jong-Beom
- Energy capacitance; Phenyl ether; Poly-(phosphoric acid); Trimesic acid
- Issue Date
- AMER CHEMICAL SOC
- MACROMOLECULES, v.40, no.13, pp.4474 - 4480
- Trimesic acid and phenyl ether were in-situ polymerized as A3 and B2 monomers, respectively, in the presence of a fixed amount (10 wt %) of multiwalled carbon nanotube (MWNT) to afford hyperbranched poly(ether ketone)s (PEK's)/MWNT nanocomposites. The feed ratios of A3 and B2 monomers vary from 3:2 to 1:2 in the A3 + B2 polycondensations. The polymerization was carried out in a mildly acidic medium, i.e., poly-(phosphoric acid) or PPA, with an optimized amount of phosphorus pentoxide (P2O5) added. The overall evidence based on the data of elemental analysis (EA), thermogravimetric analysis (TGA), Fourier-transform infrared (FT-IR) spectroscopy, and scanning electron microscopy (SEM) implicates that hyperbranched PEK's were attached to the surface of MWNT to form hyperbranched PEK-g-MWNT nanocomposites. Furthermore, MWNT remained structurally intact under the polymerization and workup conditions. Evidently driven by the molecular architecture of globular hyperbranched polymers, the morphology of the nanocomposites resembles "mushroom-like clusters on MWNT stalks". The hyperbranched PEK-g-MWNT nanocomposites were soluble in polar aprotic solvents stemming from numerous carboxylic acids on their surfaces. When some of samples were dispersed in 1 M LiOH aqueous solutions, they formed very stable suspensions. The resulting lithiated nanocomposites are being investigated in the applications such as ion conductivity and energy capacitance.
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