Type

Journal Article

Authors

Jonathan N Coleman
Robert J Young
Libo Deng
Ian A Kinloch
Alan H Windle
Juan J Vilatela
Fiona M Blighe
Karen Young

Subjects

Engineering

Topics
composite dependence failure analysis nanotube orientation polymer mechanical properties v v fibers

Strong dependence of mechanical properties on fiber diameter for polymer-nanotube composite fibers: differentiating defect from orientation effects. (2010)

Abstract We have prepared polyvinylalcohol-SWNT fibers with diameters from ∼1 to 15 μm by coagulation spinning. When normalized to nanotube volume fraction, V(f), both fiber modulus, Y, and strength, σ(B), scale strongly with fiber diameter, D: Y/V(f) ∝ D(-1.55) and σ(B)/V(f) ∝ D(-1.75). We show that much of this dependence is attributable to correlation between V(f) and D due to details of the spinning process: V(f) ��� D(0.93). However, by carrying out Weibull failure analysis and measuring the orientation distribution of the nanotubes, we show that the rest of the diameter dependence is due to a combination of defect and orientation effects. For a given nanotube volume fraction, the fiber strength scales as σ(B) ∝ D(-0.29)D(-0.64), with the first and second terms representing the defect and orientation contributions, respectively. The orientation term is present and dominates for fibers of diameter between 4 and 50 μm. By preparing fibers with low diameter (1-2 μm), we have obtained mean mechanical properties as high as Y = 244 GPa and σ(B) = 2.9 GPa.
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Jonathan N Coleman, Robert J Young, Libo Deng, Ian A Kinloch, Alan H Windle, Juan J Vilatela, Fiona M Blighe, Karen Young

Experts in our system

1
Jonathan Coleman
Trinity College Dublin
Total Publications: 217