Ammonia adsorption behavior of polypropylene nonwoven fabric grafted with acrylic acid

Abstract

An attempt was made to synthesize an adsorbent by the photoinduced grafting of acrylic acid (AA) onto polypropylene nonwoven fabrics using benzophenone (BP) as a photosensitizer in a CH 3 OH/H 2 O medium. As the BP concentration was increased, the graft yield was increased up to a specific value and then decreased, and the effect of AA concentration showed the same tendency. It was also found that the graft yield increased with the reaction time and temperature. The amounts of ammonia adsorbed onto polypropylene nonwoven fabrics grafted with AA (PP-g-AA) were dependent on the graft yield, adsorption time, and ammonia gas pressure. The adsorption capacity of PP-g-AA was 5.86 mmol/g at the graft yield of 116.6%, which was much higher than that of active carbon or silica gel.

Study on the Graft Reaction of Poly(propylene) Fiber with Acrylic Acid

“…Therefore, chemical modification technologies have been used to modify or improve the surface properties of PP fiber. Among them, surface graft modification through free radical polymerization technique is one of the most commonly used methods,3–7 and methacrylic acid (MAA), methacrylamide (MAAm), acrylamide (AAm), and 2‐hydroxyethyl methacrylate (HEMA) are taken as grafting monomer for modification of PP 8–25. However, one major limitation for this method is that the grafting degree is rather low because a large quantity of homopolymers come into being as side products in the reaction.…”