Scoured ply cotton yarn was slack mercerized and slack mercerized followed by restretching the yarn in the mercerizing solution to 90, 94, 96, 100, and 103% of the original length. The six substrates so obtained together with scoured cotton were grafted independently with methyl methacrylate and acrylonitrile using ceric ammonium nitrate as initiator. The extent and rate of grafting found with slack mercerized cotton were significantly higher than those of scoured cotton irrespective of monomer used.
The same holds, but lo lesser degree, good for slack mercerized cotton followed by restretching to 90% of original length. Different situation was encountered with slack mercerized cotton followed by restretching to 94 and 103%; these substrates showed lower extent and rate of grafting than scoured cotton. Moreover, the extent and rate of grafting decreased by increasing the magnitude of stretching. Similar trend was observed when all the said substrates were subjected to oxidation with ceric ions. It is believed that there must be differences in microstructural features between scoured cotton, slack mercerized cotton and slack mercerized-restretched cottons that account for this.
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