Sensitized photoinitiated grafting ofN‐vinyl‐2‐prrolidone (NVP) to woolen substrates

摘要

AbstractThe photoinitiated copolymerization ofN‐vinyl pyrrolidone onto woolen substrates from aqueous solutions has been studied. A novel water‐soluble photosensitizer, 4‐(sulpomethyl) benzil sodium salt (Quantacure SKS—patent pending), has been developed and its efficiency assessed with and without an amine synergist. The initiator is nonmutagenic within the terms of the Ames testing procedure. Induction periods were not observed. The action of the so‐called synergist, dimethylaminoethanol, was to reduce or stop the grafting reaction. The significance of the pH of the aqueous medium is shown by a maximum in grafting being observed at pH = 4.0 for otherwise standard conditions. Aspects of impregnation procedure were examined, marked improvements in the grafting level being achieved by use of preliminary evacuation—freeze/