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Ultra-high molecular weight poly ethylene fractions with a narrow molecular weight distribution and method for the production and use thereof
Ultra-high molecular weight poly ethylene fractions with a narrow molecular weight distribution and method for the production and use thereof
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机译:分子量分布窄的超高分子量聚乙烯馏分及其生产和使用方法
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摘要
Polymer fractions such as polyethylene fractions can be produced that have a PDT less than 2.3 and a M,„ greater than 1,000,000 g/mol, 3,000,000 g/mol, or 6,000,000 g/mol. Such polyethylene fractions are separated from a UHMWPE parent polymer by first dissolving the parent polymer in a relatively good solvent. The conditions employed for such dissolution are selected to reduce the degradation of the parent polymer. The resulting parent solution is transported into a fractionation column in which a support is disposed. The fractionation column is thereafter operated at conditions effective to form a precipitate on the support comprising the desired polyethylene fraction. The polyethylene fraction may then be recovered from the fractionation column by repeatedly displacing a solvent/non-solvent mixture into the column to dissolve the polyethylene fraction. The relative concentrations of the solvent and the non-solvent are based on a solvent gradient profile of the polyethylene parent polymer.
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