Non-woven fibers-in-fibers from melt-blown polymer blends

摘要

Methods for preparing composite non-woven fibers-in-fibers, otherwise referred to as composite polymeric fibers having an island-in-sea morphology, are described. The composite polymeric fibers may be prepared by a method that includes melt-blowing a blend of a first polymer and an immiscible second polymer to form the composite polymer fibers. The first polymer forms a matrix that surrounds the second polymer. Typically, the second polymer forms nanofibers within the matrix of the first polymer. The composite polymeric fiber may be treated with a solvent that selectively dissolves the matrix of the composite polymeric fiber and that does not dissolve the nanofibers of the composite polymeric fiber, and the nanofibers then may be collected for further treatment or use.

主权项

1. A method comprising melt-blowing a blend of a first polymer and an immiscible second polymer to form a composite polymeric fiber having an island-in-sea morphology, wherein the first polymer forms a matrix that surrounds the second polymer and the second polymer forms nanofibers within the matrix, the nanofibers having an average diameter of less than about 500 nm, and wherein the second polymer comprises poly(ethylene-co-chlorotrifluoroethylene (PECTFE).