Journal
POLYMER
Volume 185, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2019.121946
Keywords
Microwave synthesis; Hybrid polymer nanocomposite; Nanohybrid MWCNT-Polymer; In-situ polymerization
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Funding
- CONACYT [CB-2014-01, 241960, 299092]
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Covalent grafting of nylon-6 (Ny-6) and pristine multi-walled carbon nanotubes (MWCNT-P) was performed in-situ via microwave assist polymerization (MAP) of epsilon-caprolactam and 6-aminocaproic acid at different power and time conditions. The results showed that the microwave dielectric heating of the MWCNT-P activates the nanotube vacancies to react with the amine group of 6-aminocaproic acid at 175 degrees C. When the reaction temperature reaches 230 degrees C, Ny-6 polymerization ensues, simultaneously, with insertion of Ny-6 chains on the amine-activated MWCNT to obtain a nanohybrid, MWCNT-Ny, with a grafted Ny-6 coating of 14 nm. The hybridization reaction therein affects the entire polymerization process and the molecular weight and yield of both the hybrid and Ny-6. Raman, XPS and electrical conductivity data for the MWCNT-Ny films show that the nanotube structure remains intact in the films which display an electrical surface conductivity range of 0.47-0.06 S/m. The compatibility and dispersion of the MWCNT-Ny nanohybrid in Ny-6, as observed by crystallization and fusion of the so-formed hybrid polymer nanocomposite, HPNC, exceed those obtained by conventional methods of preparation using ultrasound and functionalized nanotubes.
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