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Direct radiation grafting of acrylic acid to nylon‐6 fabric and the behaviour of the resulting graft copolymer
Author(s) -
ElNaggar A. M.,
ElSalmawi K.,
Ibraheim S. M.,
Zahran A. H.
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210380204
Subject(s) - grafting , copolymer , acrylic acid , materials science , yield (engineering) , polymer chemistry , absorption of water , nylon 6 , nuclear chemistry , chemical engineering , composite material , chemistry , polymer , engineering
The role of certain cations as homopolymer inhibitors in the direct radiation grafting of acrylic acid to nylon‐6 fabric was investigated. The grafting solution was methanol and water at a ratio of 30 : 70 vol%. The maximum graft yield was obtained at 0·08 wt% when using Fe 2+ and at 0.7% for Fe 3+ . In addition, the graft yield obtained with the latter ion was higher than that for the former. Moreover, the presence of Na + and K + salts in concentrations as low as 0·1 wt% caused an increase in the graft yield. The hydrophilic properties investigated indicated that the water absorption of nylon‐6 fabric after 9 days increased by 44 times after grafting with poly(acrylic acid) at 166% graft yield. This ratio became 123 times, when this graft copolymer was transformed to the sodium salt. These ratios became 105 and 490 times for the corresponding recrystallized forms, respectively. A study was made to gain a better understanding of the observed super water absorption using SEM and DSC analysis. SEM micrographs of the recrystallized copolymer indicated the formation of large pores with a dendritic structure. Moreover, DSC showed a decrease in both the heat of fusion and melting point. The grafted nylon‐6 fabric showed a noticeable affinity for different dyestuffs.