Plasma Modified Nonwovens for Leukocyte Depletion

Melt blown nonwovens are good filtration media for leukocyte depletion in view of their excellent structures. And the critical wetting surface tension (CWST) of nonwovens media affects the adhesion to leukocytes. The surface modification of polybutylene terephthalate (PBT) melt blown nonwovens is realized by plasma induced and grafted process. Main parameters affecting low temperature plasma Inducement and graft modification of acrylic acid onto PBT melt blown nonwovens are studied. The surface tension and filtration performances of grafted media are analyzed. CWST of PBT nonwovens is significantly improved by plasma inducement and graft modification. And modified PBT melt blown nonwovens have good filtration efficiency for leukocyte filtration.