Semimetallic Transport In Nanocomposites Derived from Grafting of Linear and Hyperbranched Poly(phenylene sulfide)s onto the Surface of Functionalized Multi-Walled Carbon Nanotubes
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- Semimetallic Transport In Nanocomposites Derived from Grafting of Linear and Hyperbranched Poly(phenylene sulfide)s onto the Surface of Functionalized Multi-Walled Carbon Nanotubes
- Jeon, In-Yup; Lee, Hwa-Jeong; Choi, Yeong Suk; Tan, Loon-Seng; Baek, Jong-Beom
- Chemical doping; Chlorobenzoic acids; Conductive nanocomposites; Covalent attachments; Dispersability; Friedel-Crafts acylation; Functionalized; Hyperbranched; Hyperbranched polies; Model studies; Nucleophilic substitution reactions; Phenylene sulfides; Processability; Reaction sequences; Semimetallic; Sodium carbonates; Surface conductivities
- Issue Date
- AMER CHEMICAL SOC
- MACROMOLECULES, v.41, no.20, pp.7423 - 7432
- The semimetallic conductive nanocomposites, linear or hyperbranched poly(phenylene sulfide) (PPS) grafted multiwalled carbon nanotubes (MWNT), were successfully prepared by two-step reaction sequences. MWNT were first functionalized with 4-chlorobenzoic acid in poly(phosphoric acid) (PPA)/phosphorus phentoxide (P2O5) medium in a "direct" Friedel-Crafts acylation reaction to afford 4-chlorobenzoyl-functionalized MWNT (CB-MWNT). A subsequent nucleophilic substitution reaction between CB-MWNT) and 4-chlorobenzenthiol as an AB monomer or 3,5-dichlorobenzenthiol as an AB(2) monomer was conducted to graft the linear PPS (LPPS) or hyperbranched PPS (HPPS) in NMF/toluene in the presence of sodium carbonate to afford LPPS grafted MWNT (LPPS-g-MWNT) or HPPS grated MWNT (HPPS-g-MWNT), respectively. The covalent attachment of corresponding polymers onto the surface of MWNT was indirectly confirmed by a model study. The structures of polymer-grafted nanocomposites were clearly discernible from those of the samples prepared by solution-blending of LPPS and CB-MWNT. The dispersability and melt-processability of nanocomposites were enhanced by the grafting of PPS polymers. Thus, the nanocomposite specimens could be easily compression molded. Without chemical doping, the measured surface conductivities of as-prepared LPPS-g-MWNT and HPPS-g-MWNT molded samples were in the semimetallic transport region at 11.76 and 3.56 S/cm, respectively.
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