scholarly journals Synthesis of Ultra-High-Molecular-Weight Aromatic Polyacetylenes with [Rh(norbornadiene)Cl]2-Triethylamine and Solvent-Induced Crystallization of the Obtained Amorphous Polyacetylenes

1991 ◽  
Vol 23 (9) ◽  
pp. 1135-1138 ◽  
Author(s):  
W Yang ◽  
M Tabata ◽  
S Kobayashi ◽  
K Yokota ◽  
A Shimizu
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ultra High Molecular Weight ◽  
Induced Crystallization

scholarly journals Effect of Ultra-High-Molecular-Weight Molecular Chains on the Morphology, Crystallization, and Mechanical Properties of Polypropylene

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4222
Author(s):  
Takumitsu Kida ◽  
Takeyoshi Kimura ◽  
Ayaka Eno ◽  
Khunanya Janchai ◽  
Masayuki Yamaguchi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Crystallization Process ◽  
Tensile Deformation ◽  
Measurement Techniques ◽  
Extruded Films ◽  
Melt Elasticity ◽  
Ultra High Molecular Weight ◽  
Induced Crystallization

The effects of the ultra-high-molecular-weight (UHMW) component of polypropylene (PP) on its rheological properties, crystallization behavior, and solid-state mechanical properties were investigated using various measurement techniques. The terminal relaxation time—determined by measuring the linear viscoelasticity—was increased by adding the UHMW component. The increase in the melt elasticity produced by adding the UHMW component was observed by measuring the steady-state shear flow, although the shear viscosity was not greatly affected. Owing to the long characteristic time of the Rouse relaxation of the UHMW component, PP with the UHMW component formed highly oriented structures through a shear-induced crystallization process. The addition of the UHMW component enhanced the orientation and regularity of crystalline structure for extruded films. Therefore, the Young’s modulus, yield stress, and strength were higher in the PP film containing the UHMW component than in one without the UHMW component, irrespective of the direction of tensile deformation.

Shear-induced crystallization in isotactic polypropylene containing ultra-high molecular weight polyethylene oriented precursor domains

Polymer ◽  
2005 ◽  
Vol 46 (9) ◽  
pp. 3096-3104 ◽  
Author(s):  
Daniel Dikovsky ◽  
Gad Marom ◽  
Carlos A. Avila-Orta ◽  
Rajesh H. Somani ◽  
Benjamin S. Hsiao
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Isotactic Polypropylene ◽  
Ultra High Molecular Weight ◽  
Induced Crystallization

Application of ultra-high molecular weight polyethylene in a hydraulic drive

2020 ◽  
pp. 77-78
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
High Molecular Weight ◽  
Hydraulic Drive ◽  
Control Valve ◽  
Hydraulic Control ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Hydraulic Oil ◽  
Ultra High Molecular Weight

The use of ultra-high molecular weight polyethylene (UHMW PE) for the manufacture of various parts, in particular cuffs for hydraulic drives, is proposed. The properties and advantages of UHMW PE in comparison with other polyethylene materials are considered. Keywords ultra-high molecular weight polyethylene, hydraulic pump, hydraulic motor, hydraulic control valve, hydraulic oil, low temperature. [email protected]

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