The effect of temperature and deformation rate on the hot-drawing behavior of porous high-molecular-weight polyethylene fibers

1982 ◽  
Vol 27 (6) ◽  
pp. 2209-2228 ◽  
Author(s):  
J. Smook ◽  
A. J. Pennings
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Deformation Rate ◽  
Effect Of Temperature ◽  
Hot Drawing ◽  
Polyethylene Fibers

Comparison between self-reinforced composites based on ultra-high molecular weight polyethylene fibers and isotropic UHMWPE

2020 ◽  
Vol 30 (1) ◽  
pp. 49-51 ◽  
Author(s):  
Dilyus I. Chukov ◽  
Dmitrii D. Zherebtsov ◽  
Leonid K. Olifirov ◽  
Valerii G. Torokhov ◽  
Aleksey V. Maksimkin
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Reinforced Composites ◽  
Ultra High Molecular Weight ◽  
Polyethylene Fibers

scholarly journals A theory relating the action of salts on bacterial respiration to their influence on the solubility of proteins

1947 ◽  
Vol 134 (875) ◽  
pp. 181-201 ◽  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Dehydrogenase Activity ◽  
Halophilic Bacteria ◽  
Convincing Evidence ◽  
Effect Of Temperature ◽  
Bacterial Respiration ◽  
Concentrated Solutions ◽  
Salting Out ◽  
Intact Cells

Evidence has been presented indicating that the action of concentrated solutions of salts on bacterial respiration may be partly explained in terms of salting-out. It has been suggested that the material upon which this action is exerted is probably one of the proteins concerned in respiration, perhaps a dehydrogenating enzyme. This theory provides satisfactory explanations for: ( a ) the relation between salt con­centration and rate of respiration or dehydrogenase activity; ( b ) the effect of temperature on this relation; and ( c ) the effect of pH on this relation, if it is further supposed that only the zwitterionic fraction of the protein is involved. The relative actions of various salts are in fair agreement with this suggestion, but provide no very convincing evidence either for or against it. The chief point of difficulty lies in the range of concentration over which the action is manifest. With halophilic bacteria, the evidence is consonant with the above view if the protein involved is one of high molecular weight. With normal organisms the salt concentra­tions are much lower than those causing salting-out. There is a little evidence that in normal organisms the dehydrogenating enzymes are less sensitive to salts than the intact cells, which may be the source of the discrepancy. No reason for this can yet be suggested, but the property must be absent from the enzymes of halophilic organisms, and whatever it is, its absence must be the foundation of the halophilic character.

Ultradrawing novel ultra-high molecular weight polyethylene fibers filled with bacterial cellulose nanofibers

2014 ◽  
Vol 101 ◽  
pp. 1-10 ◽  
Author(s):  
Jen-taut Yeh ◽  
Chih-Chen Tsai ◽  
Chuen-Kai Wang ◽  
Jhih-Wun Shao ◽  
Ming-Zheng Xiao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Bacterial Cellulose ◽  
High Molecular Weight ◽  
Cellulose Nanofibers ◽  
Ultra High Molecular Weight ◽  
Polyethylene Fibers

Effects of electron beam irradiation on structure and properties of ultra-high molecular weight polyethylene fiber

2017 ◽  
Vol 47 (6) ◽  
pp. 1357-1377 ◽  
Author(s):  
Dongliang Dai ◽  
Meiwu Shi
Keyword(s):  
Molecular Weight ◽  
Electron Beam ◽  
High Molecular Weight ◽  
Electron Beam Irradiation ◽  
Breaking Strength ◽  
Beam Irradiation ◽  
Elongation At Break ◽  
Gel Content ◽  
Ultra High Molecular Weight ◽  
Polyethylene Fibers

This study introduced trimethylolpropane trimethacrylate into ultra-high molecular weight polyethylene fibers through supercritical CO2 pretreatment before the fibers were irradiated under an electron beam. Significant differences, emerging in the ultra-high molecular weight polyethylene fibers’ gel content, mechanical properties, and creep property according to their different irradiation doses, were studied through one-way analysis of variance. Regression equations were established between the irradiation dose and the gel content, breaking strength, elongation at break, and creep rate by regression analysis. A reasonable irradiation dosage range was determined after a verification experiment and the impact trends were analyzed; additionally, the sensitized irradiation crosslinking mechanism of ultra-high molecular weight polyethylene fibers was preliminarily examined. Then the surface morphology, chemical structures, thermal properties, and crystal properties of treated ultra-high molecular weight polyethylene fibers were measured. The results showed that as the irradiation dose increased, the gel content first rose and then declined; the breaking strength decreased continuously; the elongation at break increased at first and then decreased; and the creep rate originally fell and then rose before finally declining slowly. Electron beam irradiation had a significant etching effect on the fibers’ surface, and both the melting point and crystallinity decreased slightly.

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