SURFACE MODIFICATION OF ETHYLENE-ACRYLIC ACID COPOLYMER (EAA) FILMS USING VARIOUS LINKER LAYERS

摘要

Two reaction systems were developed to covalently graft polyethylene glycol (PEG) chains on ethylene acrylic acid copolymer (EAA) surfaces without significant penetration of reactants. The scheme involved surface grafting of link molecular l-lysine or link layer poly(glycidyl methacrylate) (PGMA), followed by covalent bonding of PEG chains. For the PGMA method, AFM images showed that large, isolated surface domains on the micron scale existed on the EAA surface because of phase separation during dip coating and drying of the PGMA. For the l-lysine method, NHS and EDC were used to activate the carboxylic acid groups of the EAA. After activation, l-lysine was grafted onto the EAA surface, followed by PEG grafting. Each step of the surface modification was followed by ATR-FTIR spectroscopy, XPS, and AFM.