scholarly journals A Novel Ziegler–Natta-Type Catalytic System—TiCl4/2,2′-Dimethoxy-1,1′-Binaphthalene/Et3Al2Cl3/Bu2Mg for Production of Ultrahigh Molecular Weight Polyethylene Nascent Reactor Powders, Suitable for Solvent-Free Processing

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1281 ◽  
Author(s):  
Olga Serenko ◽  
Mikhail Buzin ◽  
Vladislav Tuskaev ◽  
Svetlana Gagieva ◽  
Nikolay Kolosov ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Catalytic System ◽  
High Strength ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Melting Behavior ◽  
Solvent Free ◽  
X Ray Diffraction ◽  
Molecular Weights ◽  
Ultrahigh Molecular Weight ◽  
Different Temperatures

A series of ultrahigh molecular weight polyethylenes with viscosity-average molecular weights in the range of 1.6–5.6 × 106 have been prepared by using a novel Ziegler–Natta-type catalytic system—TiCl4/2,2′-dimethoxy-1,1′-binaphthalene/Et3Al2Cl3/Bu2Mg at different temperatures (Tpoly) in the range between 10 and 70 °C in toluene. The morphology of the nascent reactor powders has been studied by scanning electron microscopy, wide-angle X-ray diffraction, and the DSC melting behavior. Polymers are suitable for the modern processing methods—the solvent-free solid-state formation of super high-strength (tensile strength over 1.8–2.5 GPa) and high-modulus (elastic modulus up to 136 GPa) oriented film tapes. With decrease of Tpoly, the drawability of the reactor powders increased significantly.

scholarly journals Unprecedented High-Modulus High-Strength Tapes and Films of Ultrahigh Molecular Weight Polyethylene via Solvent-Free Route

2011 ◽  
Vol 44 (14) ◽  
pp. 5558-5568 ◽  
Author(s):  
Sanjay Rastogi ◽  
Yefeng Yao ◽  
Sara Ronca ◽  
Johan Bos ◽  
Joris van der Eem
Keyword(s):  
Molecular Weight ◽  
High Strength ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Solvent Free ◽  
High Modulus ◽  
Ultrahigh Molecular Weight

Preparation and thermal property of ultrahigh molecular weight polyethylene composites filled by calcium carbonate modified with long chain

2018 ◽  
Vol 33 (4) ◽  
pp. 464-476 ◽  
Author(s):  
Zexiong Wu ◽  
Zishou Zhang ◽  
Kancheng Mai
Keyword(s):  
Molecular Weight ◽  
Calcium Carbonate ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Melting Behavior ◽  
Scanning Calorimetry ◽  
Ultrahigh Molecular Weight ◽  
Novel Method ◽  
Uhmwpe Composites ◽  
Crystallization And Melting Behavior ◽  
Excellent Property

Ultrahigh molecular weight polyethylene (UHMWPE) is an excellent property polymer, but its poor processability due to high melt viscosity limits the more wide-ranging application. To improve the processability of UHMWPE composites filled by calcium carbonate (CaCO3), a novel method is reported to modify CaCO3. PE wax coated on the surface of CaCO3 (PEW@CaCO3) can be prepared by acrylic acid–modified CaCO3 (AA-CaCO3) and PE wax. The crystallization and melting behavior of UHMWPE and its composites filled by CaCO3, AA-CaCO3, and PEW@CaCO3 was compared by differential scanning calorimetry. The processability of UHMWPE composites was characterized by torque rheometer. The effect of CaCO3, AA-CaCO3, and PEW@CaCO3 on the crystallization and processability of UHMWPE was discussed.

scholarly journals Тепловой эффект перехода моноклинной фазы в орторомбическую в сверхвысокомолекулярном полиэтилене

2019 ◽  
Vol 61 (10) ◽  
pp. 1965 ◽  
Author(s):  
В.М. Егоров ◽  
В.А. Марихин ◽  
Л.П. Мясникова ◽  
А.К. Борисов ◽  
Е.М. Иванькова ◽  
...  
Keyword(s):  
Phase Transition ◽  
Molecular Weight ◽  
Solid State ◽  
Monoclinic Phase ◽  
Orthorhombic Phase ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Effects ◽  
Ultrahigh Molecular Weight

AbstractWe analyze heat effects associated with the solid-state phase transition in ultrahigh molecular weight polyethylene from the unstable monoclinic phase into thermodynamically stable orthorhombic phase. The model proposed here for the structure of supramolecular formations of monoclinic phase does not contradict to earlier X-ray diffraction data for this polymer.

Fabrication of high-strength fibers from ultrahigh-molecular-weight polyethylene

2017 ◽  
Vol 87 (6) ◽  
pp. 1337-1350 ◽  
Author(s):  
P. M. Pakhomov ◽  
S. D. Khizhnyak ◽  
I. N. Mezheumov ◽  
V. P. Galitsyn
Keyword(s):  
Molecular Weight ◽  
High Strength ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Ultrahigh Molecular Weight

scholarly journals Gamma Rays Induced Modification in Ultrahigh Molecular Weight Polyethylene (UHMWPE)

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Suveda Aarya ◽  
Pawan Kumar ◽  
Mamta Bhatia ◽  
Sanjeev Kumar ◽  
Jyotsna Sharma ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Gamma Ray ◽  
Polymeric Materials ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Oscillatory Behavior ◽  
Morphological Properties ◽  
Polymeric Chain ◽  
X Ray Diffraction ◽  
Ultrahigh Molecular Weight ◽  
Radiation Induced

Modifications taking place in ultrahigh molecular weight polyethylene (UHMWPE) films due to gamma ray radiation-induced and investigated in correlation with the applied doses. Films were irradiated in a vacuum at room temperature by a 1.25 MeV Co60 a source with doses ranging from 0 to 300 kGg. The optical, chemical, structural, and surface morphological properties of the irradiated and unirradiated UHMWPE films were investigated by UV-Visible, FTIR, XRD, and SEM, respectively. The band gap E g decreases with increasing radiation dose and coloration effects have been seen at higher doses. FTIR spectra show an oscillatory behavior in the transmittance intensities without affecting in their peak positions. Number of small absorption peaks can be seen clearly which may be due to the cross-linking of the polymeric chain. No significant change in crystalline peak has been found in the X-ray diffraction pattern indicating the structural stability of the polymer. The morphology of the smooth topography of the polymer samples to change rougher one polymeric sample shows the formation of microvoids on the surface of the polymeric materials with the increase of the doses from 0 to 300 kGy.

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