Effects of cooling process on the solid–liquid phase separation process in ultra-high-molecular-weight polyethylene/liquid paraffin blends

2019 ◽  
Vol 77 (1) ◽  
pp. 165-181 ◽  
Author(s):  
Lei Sheng ◽  
Yanqiu Du ◽  
Hui Zhang ◽  
Zhihui Chen ◽  
Junjie Pan ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Liquid Phase ◽  
High Molecular Weight ◽  
Liquid Paraffin ◽  
Separation Process ◽  
Cooling Process ◽  
Phase Separation Process ◽  
Solid Liquid ◽  
Ultra High Molecular Weight

Stereo-chemical contributions to the glass transition and liquid–liquid phase separation in high molecular weight poly(N-vinyl carbazole)

RSC Advances ◽  
2016 ◽  
Vol 6 (35) ◽  
pp. 29326-29333 ◽  
Author(s):  
Abdul G. Al Lafi ◽  
James N. Hay
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Phase Separation ◽  
Liquid Phase ◽  
High Molecular Weight ◽  
Structural Properties ◽  
Thermal History ◽  
Liquid Phase Separation ◽  
High Molecular Weight Poly ◽  
Liquid Liquid Phase Separation

Thermal history and purification effects on the structural properties of PVK were investigated. Liquid–liquid phase separation is suggested to occur by separation of isotactic rich segments from a matrix which is predominantly atactic.

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.

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