TY - JOUR
T1 - Characterization of drawn monofilaments of liquid crystalline polymer/carbon nanoparticle composites correlated to nematic order
AU - Kalfon-Cohen, Estelle
AU - Marom, Gad
AU - Wachtel, Ellen
AU - Pegoretti, Alessandro
PY - 2009/3/20
Y1 - 2009/3/20
N2 - In this study a nanocomposite monofilament composed of a nematic thermotropic liquid crystalline polymer (TLCP) mixed with 1.5 wt.% of carbon nanoparticles (CNP) was prepared by melt extrusion. The nanoparticles had either a fibrous (VGCF) or layered (GNP) geometry. The tensile strength and modulus of the fibers increased with the draw down ratio of the filament; a positive effect on the tensile modulus is displayed by fibrous CNP, achieving values higher than those of high property organic fibers utilized as reinforcement for composite materials. Thermotropic transitions were characterized by DSC and in situ synchrotron WAXD. In particular, it was shown that the breadth of the temperature span of the crystalline-nematic transition correlated inversely with the draw down ratio. At high draw down ratio, addition of CNP also increased the relative amount of oriented polymer chains and contributed to sharpening of the mesomorphic transition.
AB - In this study a nanocomposite monofilament composed of a nematic thermotropic liquid crystalline polymer (TLCP) mixed with 1.5 wt.% of carbon nanoparticles (CNP) was prepared by melt extrusion. The nanoparticles had either a fibrous (VGCF) or layered (GNP) geometry. The tensile strength and modulus of the fibers increased with the draw down ratio of the filament; a positive effect on the tensile modulus is displayed by fibrous CNP, achieving values higher than those of high property organic fibers utilized as reinforcement for composite materials. Thermotropic transitions were characterized by DSC and in situ synchrotron WAXD. In particular, it was shown that the breadth of the temperature span of the crystalline-nematic transition correlated inversely with the draw down ratio. At high draw down ratio, addition of CNP also increased the relative amount of oriented polymer chains and contributed to sharpening of the mesomorphic transition.
KW - Carbon nanoparticles
KW - Drawn monofilament
KW - Nematic order
UR - http://www.scopus.com/inward/record.url?scp=61749095629&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2009.02.002
DO - 10.1016/j.polymer.2009.02.002
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AN - SCOPUS:61749095629
SN - 0032-3861
VL - 50
SP - 1797
EP - 1804
JO - Polymer
JF - Polymer
IS - 7
ER -