Laser-irradiation-induced surface graft polymerization method

Abstract

A laser‐induced surface graft polymerization method is reported in which surface radicals generated upon laser irradiation initiated radical polymerization. The radical concentrations generated upon excimer laser irradiation under vacuum on poly‐(ethylene terephthalate) film surfaces were measured using a radical scavenger, 1,1‐diphenyl‐2‐picrylhydrazyl. The density of surface radicals increased with laser fluence at low fluences but decreased at high fluences. Upon laser irradiation and subsequent treatment with gaseous N,N‐dimethylacrylamide, surface graft polymerization occurred. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 747–750, 1997

Surface modification of polyethylene terephthalate film by CO2 laser-induced graft copolymerization of acrylamide

“…Laser irradiation forms various radicals on the PET film surface 20. The formed radicals, when contacted with air, are rapidly modified into corresponding peroxides.…”

In vitro studies of platelet adhesion on laser-treated polyethylene terephthalate surface

“…Laser treatment of polymers introduces specific chemical groups onto the surface that not only increase the wettability of the surface8, 10 but also have a specific effect on the interaction of platelets with the surface 11. It is likely that oxygen‐containing groups are involved in making the surface optimal for platelet adhesion 2.…”

Cell behavior on laser surface-modified polyethylene terephthalatein vitro

“…Table II also shows that the water drop contact angle with KrF laser-treated PET decreased with an increase in laser pulses up to 5 and then gradually increased because of further pulses. 22,26 It seems likely that KrF laser irradiation up to five pulses produces the radicals on the PET surface that may be converted to hydrophilic groups on contact with air, and further irradiation leads to cleavage of chemical bonds and recombination of carbon radicals, producing a surface with regular ripples and hydrophobic properties. 26,27 These results indicated that cell spreading on the KrF laser-treated PET is correlated with the contact angle variations.…”