TY - JOUR
T1 - Effect of diazotization and magnetic assembly on CNT dispersion observed with hardness and modulus measurement of their epoxy composite of low CNT volume fraction
AU - Trivedi, Shreya
AU - Rudolph, Melissa
AU - Atescan, Yagmur
AU - Dai, Jingyao
AU - Cooley, Kayla
AU - Adair, James H.
AU - Mohney, Suzanne E.
AU - Yamamoto, Namiko
N1 - Funding Information:
This work was supported by the Office of Naval Research, Grant # N00014161217. The authors would like to thank Dr. Thomas Juska and Dr. Charles Bakis for helpful discussions on polymer processing, Mr. Tianyi Zhang and Dr. Mauricio Terrones for access to their lab, and Dr. Josh Stapleton and Dr. Katya Bazilevskaya for measurement assistance.
Publisher Copyright:
© 2019, Springer Nature B.V.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Polymer composites with small amount of CNTs (< 5 wt%) have been studied as a light-weight wear-resistant material with low friction, among other applications, but their modulus improvement often plateaus or diminishes with increasing CNT fraction due to agglomeration. Here, polymer nanocomposites were fabricated with randomly oriented or aligned CNTs across their volume (up to 5 mm length) by CNT surface diazotization and by static magnetic field application (400 G for 40 min). With the improved CNT dispersion and thus less agglomeration, the reduced moduli of PNCs stayed improved with addition of up to 1 vol% (or 1.3 wt%) of CNTs. In this work, the PNCs with randomly oriented CNTs exhibited higher stiffness than the PNCs with magnetically aligned and assembled CNTs, indicating again the negative effect of CNT agglomeration on stiffness. In future, other CNT structuring methods with controlled inter-CNT contacts will be conducted to dissociate alignment from local agglomeration of CNTs and thus to simultaneously improve hardness and modulus of PNCs with small CNT addition.
AB - Polymer composites with small amount of CNTs (< 5 wt%) have been studied as a light-weight wear-resistant material with low friction, among other applications, but their modulus improvement often plateaus or diminishes with increasing CNT fraction due to agglomeration. Here, polymer nanocomposites were fabricated with randomly oriented or aligned CNTs across their volume (up to 5 mm length) by CNT surface diazotization and by static magnetic field application (400 G for 40 min). With the improved CNT dispersion and thus less agglomeration, the reduced moduli of PNCs stayed improved with addition of up to 1 vol% (or 1.3 wt%) of CNTs. In this work, the PNCs with randomly oriented CNTs exhibited higher stiffness than the PNCs with magnetically aligned and assembled CNTs, indicating again the negative effect of CNT agglomeration on stiffness. In future, other CNT structuring methods with controlled inter-CNT contacts will be conducted to dissociate alignment from local agglomeration of CNTs and thus to simultaneously improve hardness and modulus of PNCs with small CNT addition.
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U2 - 10.1007/s11051-019-4697-9
DO - 10.1007/s11051-019-4697-9
M3 - Article
AN - SCOPUS:85076428614
SN - 1388-0764
VL - 21
JO - Journal of Nanoparticle Research
JF - Journal of Nanoparticle Research
IS - 12
M1 - 270
ER -