Studies on nonisothermal crystallization of ultra-high molecular weight polyethylene in liquid paraffin

2005 ◽  
Vol 99 (5) ◽  
pp. 2782-2788 ◽  
Author(s):  
Chunfang Zhang ◽  
Baoku Zhu ◽  
Genliang Ji ◽  
Youyi Xu
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Liquid Paraffin ◽  
Nonisothermal Crystallization ◽  
Ultra High Molecular Weight

scholarly journals Particle morphology, structure and properties of nascent ultra-high molecular weight polyethylene

2020 ◽  
Vol 7 (8) ◽  
pp. 200663
Author(s):  
Wenyang Zhang ◽  
Zhengwen Wu ◽  
Hanjun Mao ◽  
Xinwei Wang ◽  
Jianlong Li ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Particle Size ◽  
High Molecular Weight ◽  
Liquid Paraffin ◽  
Particle Morphology ◽  
Particle Growth ◽  
Structure And Properties ◽  
Uhmwpe Particle ◽  
Ultra High Molecular Weight ◽  
Polymerization Method

The effects of particle morphology on the structure and swelling/dissolution and rheological properties of nascent ultra-high molecular weight polyethylene (UHMWPE) in liquid paraffin (LP) were elaborately explored in this article. Nascent UHMWPE with different particle morphologies was prepared via pre-polymerization technique and direct polymerization. The melting temperature and crystallinity of UHMWPE resins with different particle morphologies were compared, and a schematic diagram was proposed to illustrate the mechanism of UHMWPE particle growth synthesized by pre-polymerization method and direct polymerization. The polymer globules in the nascent UHMWPE prepared by using pre-polymerization technique are densely packed and a positive correlation between the particle size and the viscosity-averaged molecular weight can be observed. The split phenomenon of particles and the fluctuation in the viscosity of UHMWPE/LP system prepared by direct polymerization can be observed at a low heating rate and there is no correlation between particle size and viscosity-averaged molecular weight.

Effect of Carbon Coating on the Properties of Gamma Irradiated Ultra-High-Molecular-Weight Polyethylene Specimens

2000 ◽  
Vol 28 (3-4) ◽  
pp. 445-449 ◽  
Author(s):  
Debi P. Mukherjee ◽  
Alan L. Ogden ◽  
R. H. Mayeux ◽  
U. Siriwardane ◽  
H. R. Patel
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Carbon Coating ◽  
Gamma Irradiated ◽  
Ultra High Molecular Weight
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