The composition of polyethylene, a reference standard for polyethylene, method for production of a fraction of polyethylene, polyolefin composition, method of production of a fraction of a polyolefin.Method of use of a fraction of a polyolefin, polyethylene fraction and the use of a fraction of polyethylene

摘要

The composition of polyethylene, padu00e3o reference polyethylene, method for production of a fraction of polyethylene, polyolefin composition, method of production of a fraction of a polyolefin.Method of use of a fraction of a polyolefin, polyethylene fraction and the use of a fraction of a polyethylene polymeric fractions, such as fractions of polyethylene.Can be produced which have a PDI less than 2.3 and a MW greater than 1000000 g / mol, 3000000 g / mol or 6000000 g / mol.Such fractions of polyethylene are separated from an original polymer UHMWPE first dissolving the polymer in a solvent for the original good.The conditions employed for such dissolution are selected to reduce the degradation of the original polymer.The original solution produced is transported to a fractionating column in which a carrier is prepared.The fractionating column is after which operated under conditions effective to form a precipitate on the surface including the fraction of polyethylene which is desired.The fraction of polyethylene, then, can be recovered from the fractionating column moving repeatedly to the mixture of solvent / non solvent in the column for sissolver the fraction of polyethylene.The relative concentrations of solvent and non solvent are based on a profile of the gradient of solvent of the original polymer polyethylene.