Morphology, electrical resistance, electromagnetic interference shielding and mechanical properties of functionalized MWNT and poly(urea urethane) nanocomposites

• Published in: Journal of polymer science. Part B, Polymer physics Vol. 44; no. 7; pp. 1096 - 1105
• Main Authors: Wu, Han-Lang, Ma, Chen-Chi M., Yang, Yu-Ting, Kuan, Hsu-Chiang, Yang, Cheng-Chien, Chiang, Chin-Lung
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.04.2006; Wiley
• Subjects: Applied sciences; carbon nanotubes; Composites; electrical resistance; EMI; Exact sciences and technology; Forms of application and semi-finished materials; nanocomposites; Polymer industry, paints, wood; polyurethanes; Technology of polymers; EMI; Electrical properties; Mechanical properties; Carbon nanotubes; Organic silane; electrical resistance; Absorptivity; Urea copolymer; Electromagnetic shielding; Experimental study; Urethane copolymer; Polyaddition; nanocomposites; polyurethanes; Surface electrical conductivity; Tensile strength; Microwave absorption; Multiwalled nanotube; Morphology; Preparation; Concentration effect; Nanocomposite; Dimethylsiloxane copolymer; Modified material
• ISSN: 0887-6266; 1099-0488
• DOI: 10.1002/polb.20766

The functionalized multi‐walled carbon nanotubes (MWNT) had been prepared by free radical reaction with vinyltriethoxysilane. Polydimethylsiloxane (PDMS)‐based poly(urea urethane) (PUU) was also synthesized. PUU was further end‐capped with aminopropyltriethoxysilane (A‐silane), or with phenyltrimethoxysilane (P‐silane). Fourier transform infrared (FTIR), Raman spectra and thermogravimetric analysis (TGA) confirmed the functionalization of MWNT. The Mn and Mw of PUU were 85,123 and 235,876 g/mol, respectively. Both A‐silane end‐capped PUU and P‐silane end‐capped PUU showed improved dispersion of MWNT compared with that of PUU and MWNT. Moreover, the reduced discrepancy of surface electrical resistance of the two sides of the MWNT/PUU nanocomposite film was found due to the homogeneous dispersion of MWNT. The microwave absorption and tensile strength of MWNT/PUU were also improved by the well dispersion of MWNT in PUU matrix. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 1096–1105, 2006