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ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE FRACTIONS HAVING NARROW MOLECULAR WEIGHT DISTRIBUTIONS AND METHODS OF MAKING AND USING THE SAME
ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE FRACTIONS HAVING NARROW MOLECULAR WEIGHT DISTRIBUTIONS AND METHODS OF MAKING AND USING THE SAME
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机译:具有窄分子量分布的超高分子量聚乙烯馏分及其制备和使用方法
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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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机译:可以生产PDT小于2.3且M,η为1的聚合物级分,例如聚乙烯级分。大于1,000,000 g / mol,3,000,000 g / mol或6,000,000 g / mol。通过首先将母体聚合物溶解在相对良好的溶剂中,将此类聚乙烯级分与UHMWPE母体聚合物分离。选择用于这种溶解的条件以减少母体聚合物的降解。将得到的母液运输到分馏塔中,在该分馏塔中放置了载体。此后,分馏塔在有效地在包含所需聚乙烯级分的载体上形成沉淀物的条件下操作。然后可以通过将溶剂/非溶剂混合物重复地置换到塔中以溶解聚乙烯级分而从分馏塔中回收聚乙烯级分。溶剂和非溶剂的相对浓度基于聚乙烯母体聚合物的溶剂梯度曲线。
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