Effects of oxidation on mechanical and physical properties of ultra-high-modulus and ultra-high-molecular-weight polyethylene fibres

Polymer ◽  
1992 ◽  
Vol 33 (3) ◽  
pp. 536-545 ◽  
Author(s):  
You-Lo Hsieh ◽  
Geoff Barrall ◽  
Shanqing Xu
Keyword(s):  
Molecular Weight ◽  
Physical Properties ◽  
High Molecular Weight ◽  
High Modulus ◽  
Mechanical And Physical Properties ◽  
Ultra High Molecular Weight

scholarly journals The nanostructuring of ultra-high-molecular-weight polyethylene in thermal and mechanical fields as revealed by DSC

2021 ◽  
Vol 2103 (1) ◽  
pp. 012095
Author(s):  
L P Myasnikova ◽  
A K Borisov ◽  
Yu M Boiko ◽  
A P Borsenko ◽  
V F Drobot’ko ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Melting Temperature ◽  
Mechanical Characteristics ◽  
Thickness Distribution ◽  
High Strength ◽  
High Modulus ◽  
Know How ◽  
First Time ◽  
Ultra High Molecular Weight

Abstract The ultra-high-molecular-weight polyethylene reactor powders are widely used for the actively developing solvent-free method for producing high-strength high-modulus PE filaments, which includes the compaction and sintering of a powder followed by orientational hardening. To find an appropriate regime of the technological process, it is important to know how the nanostructure changes when transforming from a powder to a precursor for hardening. Nanocrystalline lamellae are characteristics of the powder structure. For the first time, the DSC technique was used to follow changes in the thickness distribution of lamellae in ultra-high-molecular-weight polyethylene reactor powder on its way to a precursor for orientation hardening. It was found that the percentage of thick (>15 nm) and thin (10 nm) lamellae in compacted samples and those sintered at temperatures lower than the melting temperature of PE (140°C) remains nearly the same. However, significant changes in the content of lamellae of different thicknesses were observed in the samples sintered at 145°C with subsequent cooling under different conditions. The influence of the lamellae thickness distribution in precursors on the mechanical characteristics of oriented filaments was discussed.

THEORETICAL MODEL OF INCREASED RESOURCE UPGRADED DOUBLE DISC COULTERS GRAIN DRILL

2020 ◽  
Author(s):  
A.T. Lebedev ◽  
◽  
R.A. Notov ◽  
R.R. Iskenderov ◽  
◽  
...  
Keyword(s):  
Molecular Weight ◽  
Theoretical Model ◽  
Physical Properties ◽  
High Molecular Weight ◽  
Time Interval ◽  
Agricultural Enterprises ◽  
Ultra High Molecular Weight ◽  
Technical Terms

Existing agro-technical terms put agricultural enterprises in a situation where they are forced to wait for the necessary physical properties of soils before starting sowing work. The use of ultra-high molecular weight UHMWPE polyethylene for the modernization of the design of disc coulters can extend the time interval in which the sowing process will take place without disrupting its performance.

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