TY - GEN
T1 - Effects of surface conditions on rheological properties and phase orientation of sheared lcp melts in nanochannels by MD studies
AU - He, Lan
AU - Yung, Kai Leung
AU - Shen, Yun Wen
AU - Xu, Yan
PY - 2006/12/1
Y1 - 2006/12/1
N2 - The rheological properties and phase orientation of liquid crystalline polymer (LCP) melts flowing in a nanochannel with different surface roughness are investigated by molecular dynamics (MD) simulations. Simulation results show the surface roughness has great impact on the rheological properties and phase orientation of LCP melts in the nanochannel (cross section is 12nm). As the amplitude of serrations increases, the shear viscosity increases nonlinearly and the value of orientational order parameter decreases. When the serration amplitude is larger than 1 .lnm, a phase transition (from nematic to isotropic phase) of LCP melt happens, which makes flowing in nanochannels more difficult. On the other hand, the influence of serration period on the shear viscosity and orientational order parameter are found not so obvious. Findings in this study will be helpful for injection molding plastic products with nanofeatures.
AB - The rheological properties and phase orientation of liquid crystalline polymer (LCP) melts flowing in a nanochannel with different surface roughness are investigated by molecular dynamics (MD) simulations. Simulation results show the surface roughness has great impact on the rheological properties and phase orientation of LCP melts in the nanochannel (cross section is 12nm). As the amplitude of serrations increases, the shear viscosity increases nonlinearly and the value of orientational order parameter decreases. When the serration amplitude is larger than 1 .lnm, a phase transition (from nematic to isotropic phase) of LCP melt happens, which makes flowing in nanochannels more difficult. On the other hand, the influence of serration period on the shear viscosity and orientational order parameter are found not so obvious. Findings in this study will be helpful for injection molding plastic products with nanofeatures.
KW - GB-spring-bead model
KW - Liquid crystalline polymers
KW - Molecular dynamics simulations
KW - Shear viscosity
KW - The orientational order parameter
UR - http://www.scopus.com/inward/record.url?scp=38949129819&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
SN - 0878494219
SN - 9780878494217
T3 - Materials Science Forum
SP - 624
EP - 627
BT - Advances in Materials Manufacturing Science and Technology II - Selected Papers from the 12th International Manufacturing Conference in China
T2 - 12th International Manufacturing Conference in China, IMCC2006
Y2 - 21 September 2006 through 23 September 2006
ER -