Disclosed is a polyvinylidene fluoride/ultra-high molecular weight polyethylene blend microporous membrane and preparation method thereof, which belongs to the field of microporous membrane. The blend microporous membrane has good hydrophobicity, mechanical properties and permeability. The preparation method includes: preparing a suspension by polyvinylidene fluoride, ultra-high molecular weight polyethylene, antioxidant and diluent; then feeding the obtained suspension into a twin-screw extruder, and the cast membrane gel extruded from the outlet is directly injected into a metal mold for injection molding; the mold temperature and the outlet temperature of the extruder are the same, and the cavity surface of the mold has micro-prism array structure; then cooling the mold in aqueous medium to obtain a nascent gel membrane; drying the obtained nascent gel membrane in a freeze dryer after removal of the diluents by extraction. The prepared membrane can be used in the membrane separation technology such as membrane distillation.

A method for producing a microporous material comprising the steps of: providing an ultrahigh molecular weight polyethylene (UHMWPE); providing a filler; providing a processing plasticizer; adding the filler to the UHMWPE in a mixture being in the range of from about 1:9 to about 15:1 filler to UHMWPE by weight; adding the processing plasticizer to the mixture; extruding the mixture to form a sheet from the mixture; calendering the sheet; extracting the processing plasticizer from the sheet to produce a matrix comprising UHMWPE and the filler distributed throughout the matrix; stretching the microporous material in at least one direction to a stretch ratio of at least about 1.5 to produce a stretched microporous matrix; and subsequently calendering the stretched microporous matrix to produce a microporous material which exhibits improved physical and dimensional stability properties over the stretched microporous matrix.

A membrane is a microporous sheet made of a blend of a first ultra high molecular weight polyolefin and a second ultra high molecular weight polyolefin. Each polyolefin has a molecular weight, both of those molecular weights are greater than 1 million, and one molecular weight is greater than the other. Additionally, the intrinsic viscosity (IV) of the membrane may be greater than or equal to 6.3.

A semipermeable asymmetric hollow fiber membrane is provided, based on a hydrophobic polymer, such as polyethersulfone or polysulfone, and on a hydrophilic polymer, such as PVP. The PVP polymer comprises a high molecular weight component and a low molecular weight component. The membrane has a significantly improved permeability and selectivity, based on its structure, composition, and the method of manufacture of the membrane A process for manufacturing such a membrane by a solvent phase inversion spinning process is also provided.

A preparation method of sodium hyaluronate with a full molecular weight distribution (MWD) is provided, including: step 1): spraying hydrogen peroxide on a sodium hyaluronate solid raw material, and conducting an ultraviolet (UV) irradiation treatment; step 2): dissolving a sodium hyaluronate degradation material in water, and adjusting a pH to higher than 7.0; step 3): subjecting a sodium hyaluronate alkaline solution to an ultrasonic treatment; step 4): preparing the sodium hyaluronate solid raw material into a sodium hyaluronate solution with a concentration of 0.1% to 1% (w/v), and thoroughly mixing the sodium hyaluronate solution in an addition proportion of 20% to 60% (v/v) with the sodium hyaluronate alkaline solution obtained after the ultrasonic treatment; and step 5): subjecting a resulting mixed solution to an adsorption treatment with diatomaceous earth and activated carbon, filtering for concentration, and drying a resulting concentrate to obtain the sodium hyaluronate with a full MWD.

There is provided a composite hollow fiber membrane for gas and vapour separation comprising: a porous membrane substrate; and a selective layer of cross-linked polydimethylsiloxane (PDMS) provided on a surface of the porous membrane substrate, wherein the molecular weight of the cross-linked PDMS is 100 kg/mol. There is also provided a method of forming the composite hollow fiber membrane, and a method of forming the cross-linked polydimethylsiloxane (PDMS) having a molecular weight 100 kg/mol.

A molecular filtration device and method of use capable of filtering and purifying molecules of a particular characteristic, wherein the amount of molecule to be filtered may be in the nanogram range and may be dispersed in a relatively large volume of solution. The resultant elution may include a substantially pure solution comprising the desired molecule.

A porous polytetrafluoroethylene membrane (20) of the present disclosure has an average pore diameter of 0.03 to 0.2 m and a porosity of more than 25% and not more than 90%. The number of pores present in a region having a width of 23 m and a thickness of 1 m in a cross-section parallel to the thickness direction is in the range from 40 to 120. The porous polytetrafluoroethylene membrane (20) is made of polytetrafluoroethylene having a number-average molecular weight in the range from 2,000,000 to 12,000,000, and a puncture strength per unit thickness is in the range from 5.0 to 15 gf/m.

A membrane is a microporous sheet made of a blend of a first ultra high molecular weight polyolefin and a second ultra high molecular weight polyolefin. Each polyolefin has a molecular weight, both of those molecular weights are greater than 1 million, and one molecular weight is greater than the other. Additionally, the intrinsic viscosity (IV) of the membrane may be greater than or equal to 6.3.

The present disclosure provides devices and methods for obtaining protein-enriched fractions from human milk. As provided herein, the present disclosure encompasses a device, comprising a delipidation unit for reducing lipid content in the human or animal milk to obtain delipidated milk and a protein-enrichment unit for increasing a protein concentration of the delipidated milk to obtain the protein-enriched fraction.