TY - GEN
T1 - Impact of ultrasonication on carbon nanotube demixing and damage in polymer nanocomposites
AU - Ganapathi, Jayadurga Iyer
AU - Kalyon, Dilhan M.
AU - Fisher, Frank T.
N1 - Publisher Copyright:
© ASC 2020.
PY - 2020
Y1 - 2020
N2 - The processing technique can significantly impact how nanoparticles are distributed and dispersed within a polymeric matrix. Homogeneity in spatial distribution and effective nanoparticle dispersion are necessary to achieve optimal polymer nanocomposite properties and can be a processing challenge. Here in particular we study the impact of ultrasonication on the dispersion and distribution of carbon nanotubes (CNTs) in the polymer nanocomposite. Specifically, we seek to better understand the interplay between nanotube demixing and damage for excessive sonication times. Here polymer nanocomposite samples of poly(caprolactone) (PCL) were mixed with CNTs using a ultrasonication process where the samples are subjected to different durations of CNT/solvent sonication. In addition to common dispersion characterization techniques, an analysis of mixing indices and the shear-induced crystallization behavior of the nanocomposites were found to be particularly insightful when used to study the effects of sonication time on nanoparticle dispersion. Findings based on TEM evidence of CNT damage, optical image analysis, and the shear-induced crystallization behavior of the samples suggest that mechanisms of demixing and damage of the CNTs co-exist within the processed nanocomposite and that both contribute to the reduction in effective properties for excessive sonication times.
AB - The processing technique can significantly impact how nanoparticles are distributed and dispersed within a polymeric matrix. Homogeneity in spatial distribution and effective nanoparticle dispersion are necessary to achieve optimal polymer nanocomposite properties and can be a processing challenge. Here in particular we study the impact of ultrasonication on the dispersion and distribution of carbon nanotubes (CNTs) in the polymer nanocomposite. Specifically, we seek to better understand the interplay between nanotube demixing and damage for excessive sonication times. Here polymer nanocomposite samples of poly(caprolactone) (PCL) were mixed with CNTs using a ultrasonication process where the samples are subjected to different durations of CNT/solvent sonication. In addition to common dispersion characterization techniques, an analysis of mixing indices and the shear-induced crystallization behavior of the nanocomposites were found to be particularly insightful when used to study the effects of sonication time on nanoparticle dispersion. Findings based on TEM evidence of CNT damage, optical image analysis, and the shear-induced crystallization behavior of the samples suggest that mechanisms of demixing and damage of the CNTs co-exist within the processed nanocomposite and that both contribute to the reduction in effective properties for excessive sonication times.
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M3 - Conference contribution
AN - SCOPUS:85097307903
T3 - Proceedings of the American Society for Composites - 35th Technical Conference, ASC 2020
SP - 349
EP - 361
BT - Proceedings of the American Society for Composites - 35th Technical Conference, ASC 2020
A2 - Pochiraju, Kishore
A2 - Gupta, Nikhil
T2 - 35th Annual American Society for Composites Technical Conference, ASC 2020
Y2 - 14 September 2020 through 17 September 2020
ER -