Three different sources of cotton (Medical, Iraqi fluff, and Iraqi tail) have been treated with reductive reagent (sodium borohydride) in order to increase the surface area that’s could grafted by poly(N-isopropylacrylamide-co-Acrylamide) (PNI-co-AAm) and poly (N- isopropylacrylamide-co-Ethylene glycol) (PNI-co-EG) hydrogels to develop their ability for water absorption. The hydrogels were prepared by free radical polymerization, characterized by gel permeation chromatography (GPC) to measure their molar weights (Mp) as well as other related properties. The density of crosslinking (DC) of the prepared hydrogels has been calculated by means of Flory-Rehner equation which confirmed that the (PNI-co-EG) have a higher crosslinking density (12.92×10-4) more than (PNI-co-AAm) (3.44×10-4) and this result was agreed with the su−r𝟐face𝟐 area that’s evaluated via Brunauer-Emm−𝟐ett-𝟐 Teller (BET) technique whichmorphology of the handled cottons have been studied by scanning electron microscopy (SEM). Water swelling ratios (WSR) of all grafted cottons and for all treatment durations were determined at (35C) which pointed a changing in swelling and absorption ability between the grafted hydrogels over the treated cottons.
Volume 11 | 12-Special Issue