抄録
This research has been done with the main object of improvement in wet crease resistance of the acetate fabric. Vinyl monomer i.e. methyl acrylate (MA), ethyl acrylate (EA), propyl acrylate (PA), butyl acrylate (BA), methyl methacrylate (MMA), styrene (ST), or acrylonitrile (AN) was graft-polymerized with Ce initiator onto an acetate fabric by the vapour phase method. The relation between dry or wet crease recovery and add-on or graft amount on the treated fabric has been investigated. Among those monomers only PA and BA are effective to increase dry or wet crease recovery of the acetate fabric. The mechanical properties of the BA-treated fabric i.e. crease recovery, tearing strength and stiffness were determined at different add-ons. Influence of the pretreating conditions (Ce conc., AcOH conc., temp., impregnation) and influence of the extraction of homopolymer upon those mechanical properties have been investigated.
The results obtained are as follows:
(1) The BA-treated fabric has the maximum dry and wet crease resistance at about 5% addon by 10_??_15% (dry) or by 15_??_20% (wet) higher crease recovery than the untreated. It has also 80% tearing strength, slightly higher stiffness, and its single fiber has an increase of tenacity, extension, and yield elongation compared with the untreated.
(2) In order to obtain the highest crease recovery of the BA-treated fabric, conditions of the pretreatment should be that the Ce concentration is 0.03_??_0.1mol/l, the AcOH concentration about 10%, the temperature about 40°C and the liquid retention of the pretreated fabric is about 30%.
(3) By extraction of the homopolymer with benzene from the BA-treated fabric, the dry crease recovery rises, and the wet lowers at the same add-on or grafting.
(4) The reasons why PA- or BA-treatment increase the crease recovery of the acetate fabric would be that they have little swelling or dissolving power for the acetate, that the glass transition points of their polymers are relatively low, and that the treated fabric or its single fiber has rubber-like elasticity and water-repellency.
