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.