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Structure and properties Structure of UHMWPE, with n greater than 100,000. UHMWPE is a type of polyolefin. It is made up of extremely long chains of polyethylene, which all align in the same direction. It derives its strength largely from the length of each individual molecule (chain).
Oct 1, 2020 · Therefore, an analysis of polymer chain ends can shed light on the nature of transfer processes. As seen in Table 4, a zirconium complex catalyzed polymerization of ethylene produces polyethylene with 96–71% vinyl chain-ends (Table 4, entries 1–3) and lower M w [128]. On the contrary, the corresponding titanium complex shows little or no ...
- Ketan Patel, Ketan Patel, Samir H. Chikkali, Samir H. Chikkali, Swaminathan Sivaram, Swaminathan Siv...
- 2020
Polyethylene or polythene (abbreviated PE; IUPAC name polyethene or poly (methylene)) is the most commonly produced plastic. [7] It is a polymer, primarily used for packaging ( plastic bags, plastic films, geomembranes and containers including bottles, etc.).
Ultra-high-molecular-weight polyethylene (UHMWPE) plays an important role in many important fields as engineering plastics. In this contribution, a precipitation polymerization strategy is developed by combination of highly active phosphino-phenolate nickel catalysts with polymer-insoluble solvent (heptane) to access UHMWPE (Mn up to 8.3 × 106 g mol–1) with good product morphology, free ...
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Oct 1, 2020 · The resulting ultra-high molecular weight polyethylene (M v to 2.56•10 6 Da) can be processed by a solventless method into high-strength (up to 2.45 GPa) and high-modulus (up to 144 GPa) oriented tapes. Most polyethylene samples have a linear structure, with the exception of polymers obtained on Ni/Ti complexes, which have 2–3 branches per ...
Dec 12, 2017 · Owing to a number of unique properties including wear resistance, resistance to stress cracking, notched impact strength, and ultralow embrittlement temperature, ultrahigh molecular weight polyethylene (UHMWPE), an intractable linear polyethylene resin with a molecular weight greater than 1 million g/mol [], has been recognized as a key engineering thermoplastic, demonstrating a variety of ...
Feb 4, 2020 · The effects of gamma radiation sterilization and ageing on the structure and morphology of medical grade ultra high molecular weight polyethylene. Polymer (Guildf.) 1996; 37 :2909–2913. doi: 10.1016/0032-3861(96)89386-4.
