Provided herein are methods for forming nanofibers. The current disclosure provides ceramic nanofibers, morphology-controlled ceramic-polymer hybrid nanofibers, morphology-controlled ceramic nanofibers, core-sheath nanofibers and hollow core nanofibers using ceramic precursor materials and polymer materials which are combined and undergo electrospinning. The current disclosure provides for methods of forming these nanofibers at low temperatures such as room temperature and in the presence of oxygen and moisture wherein the ceramic precursor cures to a ceramic material during the electrospinning process. Also disclosed are the nanofibers prepared by the disclosed methods.

A system and methods for producing a structure including a plurality of fibers is provided. The system includes a polymer collector having a predefined pattern, wherein the collector is charged at a first polarity, and a spinneret configured to dispense a polymer, wherein the spinneret is charged at a second polarity substantially opposite the first polarity such that polymer dispensed from the spinneret forms a plurality of fibers on the predefined pattern of the fiber collector.

A bi-component continuous filament has a sheath-core arrangement including a first polymer component forming a sheath and including a polyamide, a polyolefin, or a polyester; a second polymer component forming a core and including a polyamide, a polyolefin, or a polyester; and a binding agent adhering the first polymer component to the second polymer component along a length of the filament such that the filament has a generally uniform cross-sectional shape along the length. The binding agent preferably includes a polyolefin modified by an acid anhydride. Articles made from such bi-component continuous filaments include, for example, bulk continuous filament (BCF) fibers and floor coverings, such as mats, rugs, and carpets.

A bi-component continuous filament has a sheath-core arrangement including a first polymer component forming a sheath and including a polyamide, a polyolefin, or a polyester; a second polymer component forming a core and including a polyamide, a polyolefin, or a polyester; and a binding agent adhering the first polymer component to the second polymer component along a length of the filament such that the filament has a generally uniform cross-sectional shape along the length. The binding agent preferably includes a polyolefin modified by an acid anhydride. Articles made from such bi-component continuous filaments include, for example, bulk continuous filament (BCF) fibers and floor coverings, such as mats, rugs, and carpets.

A vascular graft, comprising a biodegradable scaffold comprising: a biodegradable polyester electrospun tubular core; a biodegradable polyester outer sheath surrounding the biodegradable polyester tubular core; and a biodegradable poly(lactide) copolymer adhesive composition (i) disposed between the polyester electrospun tubular core and the polyester outer sheath, (ii) disposed between the polyester electrospun tubular core and the polyester outer sheath and on an outer surface of the polyester outer sheath, (iii) or disposed on an outer surface of the polyester outer sheath.

A water repellent elastic yarn which is spinned from a polyurethane polymer and is adhered with a water repellent agent to obtain a water repellent elastic yarn, adapted for making a stretchable apparel, sportswear or underwear having better stretch characteristics and water repellency, whereby upon wicking of a wearer's sweat through apertures among neighboring elastic yarns of a fabric, the sweat will be well diffused and released outwardly to keep the wearer comfortable, while keeping the apparel easily dry after being wetted such as by rain water.

A method for producing microfibers includes the steps of (a) providing a base material; (b) forming the base material in a ring; (c) gripping opposing ends of the ring; (d) flipping one of the opposing ends relative to the other of the opposing ends, forming an upper portion and a lower portion; (e) folding the upper portion onto the lower portion; (f) stretching the folded upper and lower portions; and repeating steps (d)-(f) as desired. Different apparatuses for performing the method are also provided.

A method for producing microfibers includes the steps of (a) providing a base material; (b) forming the base material in a ring; (c) gripping opposing ends of the ring; (d) flipping one of the opposing ends relative to the other of the opposing ends, forming an upper portion and a lower portion; (e) folding the upper portion onto the lower portion; (f) stretching the folded upper and lower portions; and repeating steps (d)-(f) as desired. Different apparatuses for performing the method are also provided.

Filtration membrane comprising polymeric nanofibers and/or microfibers attaching dendrimer component presenting reactive sites selective for chemicals to be filtered, and related nanofibers and microfibers, composite materials, compositions, methods and system.

Filtration membrane comprising polymeric nanofibers and/or microfibers attaching dendrimer component presenting reactive sites selective for chemicals to be filtered, and related nanofibers and microfibers, composite materials, compositions, methods and system.