Abstract

Pre-irradiation grafting, mainly with an ethyl acrylate emulsion system, has been used to produce wool and cellulosic fibers having elastomeric properties. Comparative studies using selected chemically-initiated systems were also carried out. The pre-irradiation grafting-time curves were found to be auto-accelerative and grafting levels in excess of 3000 per cent could be achieved. Circa 1000 per cent graft was required to obtain fibers with high “rubber-like” elasticity. Grafting rates were found to increase substantially with temperature reducing the grafting times necessary to achieve high elasticity to the order of minutes at 35°C compared to 20 hr at ambient temperatures. Reduction of the level of grafting required to obtain elastomeric properties is clearly of interest, and it was found that when rayon fibers containing low levels of graft (below 100 per cent) were subjected to post-treatments with reagents capable of decrystallizing cellulose, the fibers, which heretofore exhibited no significant elastomeric properties, became highly elastic.

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