writer：Gai Jinggang, Li Huilin, Schrauwen Cornelius, Hu Guohua
keywords：Dissipative particle dynamics， ultrahigh molecular weight polyethylene
source：期刊
specific source：Polymer, 2009, 50(1): 336-346
Issue time：2009年

The dissipative particle dynamics (DPD) simulation method has

been used to study mesophase formation of the binary UHMWPE/PP and ternary

UHMWPE/PP/PEG blends. The effects of shear rates and volume fractions of each

of the blend components on end-to-end distances of UHMWPE, diffusivities and mesoscale

morphologies of the blends have been investigated in detail. As compositions of

the UHMWPE/PP and UHMWPE/PP/PEG blends vary, the mesoscale simulations have

predicted the ordered structures with defined morphologies of lamellas,

perforated lamellas, hexagonal spheres, and bodycentered- cubic spheres.

Micelle-like melted structures between totally disordered and the ordered phases

have also been found in the UHMWPE/PP (10/90) blends. Immiscibility property of

UHMWPE, PP and PEG induces the phase separation and exhibits different

mesoscpic morphologies at different shear rates and volume fractions. Taking

the shear rates dependence of mesophase into account, the change in morphology

of the UHMWPE/PP/PEG blends with shear rate is also well studied in this work.

As a function of PP concentration, the end-to-end distances of UHMWPE are found

to decrease with the increase of PP concentration. This effect is more prominent

for a high amount of PP.