架橋化ポリビニルアルコール繊維に対するアクリル酸エチルのグラフト重合

抄録

Grafting of ethyl acrylate (EA) onto the heat-treated polyvinyl alcohol fibers (PVA) crosslinked with glyoxal (GA) or formaldehyde (FA) was performed in aqueous Ce⁴⁺ System. Before the grafting, the fibers were swollen with a concentrated zinc chloride solution to raise the grafting rate. The graft-on of EA reaches up to about 4500%. The crystallinity of PVA fibers has the predominant influence on the grafting rate. The tensile strength and initial modulus of the grafted fibers shows a noticeable decrease, mostly corresponding with the increase in the cross-sectional area. The breaking elongation and elastic recovery show a considerable increase with the increase of graft-on. The grafted fibers with GA-crosslinks have higher elastic recovery compared with the uncrosslinked or FA-crosslinked fibers. This is considered to be due to the existence of the intermolecular GA-crosslinks. The grafted fibers with crosslinks show the great resistance for boiling water. For example, the GA-crosslinked (0.6 % by weight increase) and 2370% EA-grafted fiber give the tensile strength 0.2g/d, initial modulus 0.25g/d, elongation 88%, and elastic recovery 85 at 70% extension.