Dissipative Particle Dynamics and Flory-Huggins Theories for Predicting the Rheological Behavior of Ultrahigh Molecular Weight Polyethylene Blends
writer：Gai Jing-Gang, Hu Guo-Hua, Li Hui-Lin, Zhu Shi-Peng, Hoppe Sandrine
keywords：Dissipative Particle Dynamics， Flory-Huggins Theories， Ultrahigh Molecular Weight Polyethylene
source：期刊
specific source：Ind. Eng. Chem. Res., 2010, 49(22): 11369-11379
Issue time：2010年
This
work aims to experimentally and theoretically study the effects of normal
molecular weight polymers (NMWP) such as high-density polyethylene, low-density
polyethylene, and polypropylene as processing aids on the morphology and
rheological behavior of ultrahigh molecular weight polyethylene (UHMWPE). As is
shown by scanning electron microscope observations, rheological measurements,
and dissipative particle dynamics simulations, formation of a lubricating phase
between the UHMWPE particles is responsible for the viscosity reduction of the
UHMWPE. Besides, phase diagram studies on the UHMWPE/NMWP blend suggest that
the optimum composition ratio of the blends lies in their composition-sensitive
region when the parameter _ and molecular weight
of each component are fixed at low shear rates. Meanwhile, the optimum range of
parameter _ is above but close to
the corresponding binodal curve at high shear rates.