Electrospinning of Ultrahigh-Molecular-Weight Polyethylene Nanofibers

2008 ◽  
Vol 1083 ◽  
Author(s):  
Dmitry M. Rein ◽  
Yachin Cohen ◽  
Avner Ronen ◽  
Eyal Zussman ◽  
Kim Shuster
Keyword(s):  
Molecular Weight ◽  
Dielectric Constant ◽  
Elevated Temperature ◽  
High Molecular Weight ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Ultrahigh Molecular Weight ◽  
Electrospinning Method ◽  
Surface Modified ◽  
First Time ◽  
Ultra High Molecular Weight

ABSTRACTThe electrospinning method was employed to fabricate extremely fine nanofibers of ultra-high molecular weight polyethylene (UHMWPE) for the first time, using a mixture of solvents with different dielectric constant and conductivity. A novel experimental device for elevated temperature electrospinning of highly volatile and quickly crystallizing polymer solutions and melts was developed. The possibility to produce the highly oriented nanofibers from ultra-high molecular weight polymers suggests new ways for fabrication of ultra-strong, porous, surface modified fibers and single-component nanocomposite yarn with improved properties.

A Comparison of the Wear of Cross-Linked Polyethylene against Itself with the Wear of Ultra-High Molecular Weight Polyethylene against Itself

1996 ◽  
Vol 210 (4) ◽  
pp. 297-300 ◽  
Author(s):  
T J Joyce ◽  
A Unsworth
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Contact Stress ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Measurement Point ◽  
Wear Factor ◽  
Ultrahigh Molecular Weight ◽  
Ultra High Molecular Weight ◽  
Wear Tests

Wear tests were carried out on reciprocating pin-on-plate machines which had pins loaded at 10 N and 40 N. The materials tested were irradiated cross-linked polyethylene sliding against itself, irradiated ultra-high molecular weight polyethylene sliding against itself and non-irradiated ultra-high molecular weight polyethylene sliding against itself. After 153.5 km of sliding, the non-irradiated ultrahigh molecular weight polyethylene plates and pins showed mean wear factors under 10 N loads, or a nominal contact stress of 0.51 MPa, of 84.0 × 10−6 mm3/N m for the plates and 81.3 × 10−6 mm3/N m for the pins. Under 40 N loads, or a nominal contact stress of 2.04 MPa, the non-irradiated ultra-high molecular weight polyethylene pins sheared at 22.3 km. At the last measurement point prior to this failure, 19.1 km, wear factors of 158 × 10−6mm3/N m for the plates and 85.0 × 10−6 mm3/N m for the pins had been measured. After 152.8 km, the irradiated ultra-high molecular weight polyethylene plates and pins showed mean wear factors under 10 N loads of 59.8 × 10−6 mm3/N m for the plates and 31.1 × 10−6 mm3/N m for the pins. In contrast, after 150.2 km, a mean wear factor of 0.72 × 10−6 mm3/N m was found for the irradiated cross-linked polyethylene plates compared with 0.053 × 10−6 mm3/N m for the irradiated cross-linked polyethylene pins.

THERMOPHYSICAL AND DYNAMIC PROPERTIES OF BUTADIENE-NITRILE RUBBER FILLED WITH ULTRA HIGH-MOLECULAR WEIGHT POLYETHYLENE

2021 ◽  
Vol 0 (2) ◽  
pp. 36-43
Author(s):  
N.V. Shadrinov ◽  
◽  
A.A. Khristoforova ◽  
Keyword(s):  
Molecular Weight ◽  
Dynamic Properties ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Physicomechanical Properties ◽  
Butadiene Rubber ◽  
Rubber Compounds ◽  
Ultrahigh Molecular Weight ◽  
Before And After ◽  
Butadiene Nitrile Rubber ◽  
Ultra High Molecular Weight

The results of the study of the complex of properties of an elastomeric composite material based on nitrile butadiene rubber BNKS-18 and ultrahigh molecular weight polyethylene are presented. The effect of UHMWPE on the vulcanization characteristics of rubber compounds, the physicomechanical properties of vulcanizates before and after thermal aging in a hydrocarbon environment and air, and also on the dynamic properties before and after curing are investigated.

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.

scholarly journals A rugged, self-sterilizing antimicrobial copper coating on ultra-high molecular weight polyethylene: a preliminary study on the feasibility of an antimicrobial prosthetic joint material

2019 ◽  
Vol 7 (20) ◽  
pp. 3310-3318 ◽  
Author(s):  
Ke Wu ◽  
Samuel P. Douglas ◽  
Gaowei Wu ◽  
Alexander J. MacRobert ◽  
Elaine Allan ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Copper Coating ◽  
Prosthetic Joint ◽  
Preliminary Study ◽  
First Time ◽  
Ultra High Molecular Weight ◽  
Joint Material

We report here for the first time how a copper coating bond to ultra-high molecular weight polyethylene (UHMWPE) via low temperature aerosol assisted chemical vapour deposition.

scholarly journals Ultra-High-Molecular-Weight Polyethylene Rods as an Effective Design Solution for the Suspensions of a Cruiser-Class Solar Vehicle

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Giangiacomo Minak ◽  
Tommaso M. Brugo ◽  
Cristiano Fragassa
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Design Solution ◽  
Design And Optimization ◽  
Suspension Systems ◽  
Proper Design ◽  
Material Solution ◽  
First Time ◽  
Ultra High Molecular Weight

Ultra-high-molecular-weight polyethylene (UHMWPE) is a subgroup of the thermoplastic polyethylene characterized by extremely long chains and, as result, in a very tough and resistant material. Due to remarkable specific mechanical properties, its use is gradually being extended to multiple fields of application. This study describes, perhaps for the first time, how the UHMWPE can represent a valid material solution in the design and optimization of suspensions for automotive use, especially in the case of extremely lightweight vehicles, such as solar cars. In particular, in this design study, UHMWPE rods permitted to assure specific kinematic trajectories, functionalities, and overall performance in an exceptionally light suspension systems, developed for an innovative multioccupant solar vehicle. These rods reduced the weight by 88% with respect to the classic design solutions with similar functions, offering, at the same time, high stiffness and accuracy in the movements. An experimental campaign was conducted to evaluate the ratcheting behaviour and other mechanical properties needed for a proper design and use.

Synthesis of ultrahigh molecular weight polymers by homopolymerisation of higher α-olefins catalysed by aryloxo-modified half-titanocenes

RSC Advances ◽  
2016 ◽  
Vol 6 (20) ◽  
pp. 16203-16207 ◽  
Author(s):  
Kotohiro Nomura ◽  
Sarntamon Pengoubol ◽  
Wannida Apisuk
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Molecular Weight Distributions ◽  
High Molecular Weight Polymers ◽  
Ultrahigh Molecular Weight ◽  
Weight Distributions ◽  
Ultra High Molecular Weight

Polymerisations of 1-dodecene, 1-hexadecene, 1-octadecene by Cp*TiX2(O-2,6-iPr2C6H3) – cocatalysts afforded (ultra)high molecular weight polymers with unimodal molecular weight distributions.

Nanoscale Surface Modification of UltraHigh Molecular Weight Polyethylene (UHMWPE) Samples with the W + C Ion Implantation

2007 ◽  
Vol 1020 ◽  
Author(s):  
E. Sokullu Urkac ◽  
A. Oztarhan ◽  
F. Tihminlioglu ◽  
N. Kaya ◽  
S. Budak ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ion Implantation ◽  
Rutherford Backscattering Spectrometry ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Vacuum Arc ◽  
Implantation Technique ◽  
Metal Vapour ◽  
Ultrahigh Molecular Weight ◽  
Poly Ethylene ◽  
Ultra High Molecular Weight

AbstractIn this work, Ultra High Molecular Weight Poly Ethylene (UHMWPE) samples were implanted with W + C ion by using Metal-Vapour Vacuum Arc (MEVVA) ion implantation technique. Samples were implanted with W and C atoms with a fluence of 1017ion/cm2 and extraction voltage of 30 kV. Mechanism underlies this modification characterized with ATR-FTIR, UV-VIS-NIR Spectrum and Rutherford Backscattering Spectrometry (RBS). Surface morphology of implanted and unimplanted samples were examined in nanoscale with AFM.

scholarly journals Study on Preparation of Ultra-High-Molecular-Weight Polyethylene Pipe of Good Thermal-Mechanical Properties Modified with Organo-Montmorillonite by Screw Extrusion

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3342
Author(s):  
Zhouchao Guo ◽  
Rui Xu ◽  
Ping Xue
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Coupling Agent ◽  
Bending Strength ◽  
Engineering Application ◽  
Screw Extrusion ◽  
Thermal Mechanical Properties ◽  
First Time ◽  
Ultra High Molecular Weight

The study of processing characteristic and property optimization of ultra-high-molecular-weight polyethylene (UHMWPE) pipe is increasingly performed, mainly focusing on difficulties in the melting process and poor thermal-mechanical properties after forming, which have limited the wider engineering application of UHMWPE pipe. In this study, organo-montmorillonite (OMMT)-modified UHMWPE pipe with good thermal-mechanical properties was prepared by screw extrusion molding. First, high-density polyethylene was subjected to fluidity modification so that the screw extrusion molding of UHMWPE pipe was feasible. Then, OMMT-modified UHMWPE pipes under different addition amounts of OMMT were innovatively prepared by extrusion. Furthermore, the effects of the addition amounts of the compatibilizer HDPE-g-MAH and the silane coupling agent γ-(2,3-epoxy propoxy) propyl trimethoxy silane (KH560) on the thermal properties of OMMT-modified UHMWPE pipe were investigated for the first time. Compared with those of pure UHMWPE pipe, the Vicat softening temperature (from 128 to 135.2 °C), thermal deformation temperature (from 84.4 to 133.1 °C), bending strength (from 27.3 to 39.8 MPa), and tensile strength (from 20.8 to 25.1 MPa) of OMMT-modified UHMWPE pipe were greatly increased. OMMT-modified UHMWPE pipe with good thermal-mechanical properties was able to be prepared by extrusion for the first time. The compatibilizer method of HDPE-g-MAH was slightly more effective than the coupling agent method of KH560.

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