Biofunctionalized Multiwalled Carbon Nanotube: A Reactive Component for the in Situ Polymerization of Hyperbranched Poly(ester amide) and its Biophysico Interfacial Properties

• Published in: Journal of physical chemistry. C 2013-11, Vol.117 (47), p.25097-25107
• Main Authors: Pramanik, Sujata, Barua, Nilakshi, Buragohain, Alak K, Hazarika, Jayanta, Kumar, Ashok, Karak, Niranjan
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Nanotubes; Physics; Thermal properties of condensed matter; Thermal properties of small particles, nanocrystals, nanotubes
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp407944j

A facile method of ultrasound-assisted noncovalent functionalization of multiwalled carbon nanotubes (MWCNT) with fatty amide of castor oil and use of the same as a reactive component in the in situ polymerization of hyperbranched poly(ester amide) (HBPEA) via an A2 + B2 + A′A2 approach is reported. The reaction entails anchoring of the amide groups to MWCNT to maximize the reaction with the diacids, resulting in formation of the nanocomposite. Fourier transform infrared analyses validated the anchorage of ester-amide groups to the nanotubes. Intercalation and formation of dense polymer layers on the isotropically dispersed nanotubes (with mean coherency coefficient of 0.229) were evident from transmission electron microscopy. The changes in biophysico attributes were reflected in their selective efficacy against the Gram-positive bacteria with an enhanced cytotoxicity (death rate increase of Staphylococcus aureus by 137.5% and Bacillus subtilis by 107.6%) and significant decrease in the sheet resistance by 3 orders of magnitude (from 107 to 104 Ω sq–1) as compared to the pristine HBPEA at low loading of 1 wt % MWCNT. The multifunctional nanocomposites maintained the acceptable mechanical performance, and kinetics evaluation of activation energy revealed enhanced thermal stability over pristine HBPEA; the nanocomposites can be envisaged for MWCNT-based bionano applications, particularly in the field of advanced textiles.