Ultrahigh-Molecular-Weight Polyethylene by Using a Titanium Calix[4]arene Complex with High Thermal Stability under Polymerization Conditions
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چکیده
منابع مشابه
Synthesis of high molecular weight polyethylene using FI catalyst
A FI Zr-based catalyst of bis[N-(3,5-dicumylsalicylidene)-2′,6′diisopropylanilinato]zirconium(IV) dichloride was prepared and used for polymerization of ethylene. The effects of reaction conditions on the polymerization were examined in detail. The increase in ethylene pressure and rise in polymerization temperature up to 35 oC were favorable for catalyst/MAO to raise the catalytic activity as...
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When subjected to a monotonically increasing deformation state, the mechanical behavior of UHMWPE is characterized by a linear elastic response followed by distributed yielding and strain hardening at large deformations. During the unloading phases of an applied cyclic deformation process, the response is characterized by nonlinear recovery driven by the release of stored internal energy. A num...
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Semicrystalline microparticles of high molecular mass polyethylene can be prepared as aqueous dispersions by catalytic emulsion polymerization of ethylene with a mini-emulsified catalyst precursor (D$\rm{\frown}$D=salicylaldimine, L=pyridine). Stable polymer latexes are formed.
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Ultrahigh molecular weight polyethylene (UHMWPE) is a unique polymer with outstanding physical and mechanical properties that makes it particularly attractive to fabricate the bearing surface for artificial joints. The growing demand for UHMWPE as a bearing material for joint replacement has lead to active research in the development and understanding of its properties in addition to nanocompos...
متن کاملsynthesis of high molecular weight polyethylene using fi catalyst
a fi zr-based catalyst of bis[n-(3,5-dicumylsalicylidene)-2′,6′diisopropylanilinato]zirconium(iv) dichloride was prepared and used for polymerization of ethylene. the effects of reaction conditions on the polymerization were examined in detail. the increase in ethylene pressure and rise in polymerization temperature up to 35 oc were favorable for catalyst/mao to raise the catalytic activity as...
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ژورنال
عنوان ژورنال: Macromolecular Chemistry and Physics
سال: 2007
ISSN: 1022-1352,1521-3935
DOI: 10.1002/macp.200700075