In Situ Grafting of Hyperbranched Poly(Etherketone)s onto Multiwalled Carbon Nanotubes Via A3 + B2 Approach (Preprint)
Abstract
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 multi-walled carbon nanotube (MWNT) to afford hyperbranched poly(etherketone)s (PEKs)/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 as well as scanning electron microscopy (SEM) implicates that hyperbranched PEKs were attached to the surface of MWNT to form hyperbranched PEK-g-MWNT nanocomposites. Furthermore, MWNT remained structurally intact under the polymerization and work-up 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 the samples were dispersed in 1 molar 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2007
- Accession Number
- ADA473530
Entities
People
- David H Wang
- Hwa-jeong Lee
- Ja-young Choi
- Jong-Beom Baek
- Loon-Seng Tan
- Se-jin Oh
Organizations
- Air Force Research Laboratory