酸化鉄粒子汚れに対するアニオン性ポリビニルアルコールの汚染防止作用
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On cellulose and polyester films , the effect of addition of anionic poly(vinyl alcohol) (copolymer of vinyl acetate and sodium allyl sulfonate, designated as S-PVA) on the deposition of α-Fe_2O_3 particles was examined in suspended solution of α-Fe_2O_3. The results obtained were as follows. (1) According to observation by scanning electron microscope, the particle size of α-Fe_2O_3 deposited on polyester fabrics varied with the amount of addition of S-PVA. (2) The degree of deposition of α-Fe_2O_3 particles on the films decreased as the addition of S-PVA increased. This was also observed on the fabrics. However, at a small amount of addition (10^<-4>-10^<-3> g/100 ml), the degree of deposition of α-Fe_2O_3 became extremely low in the case of films, but such extreme lowering was not observed in the case of fabrics. (3) The coagulation of α-Fe_2O_3 particles was examined in S-PVA solutions. At concentrations between 10^<-4>-10^<-3> g/100 ml, α-Fe_2O_3 particles remarkably coagulated. This concentration region was accordance with the concentration region in which the deposition of α-Fe_2O_3 on films extremely decreased. (4) Thus, the extreme lowering in the deposition at a small amount of addition of S-PVA is supposed to be due to the mechanical disconnection which is caused by the coagulation of α-Fe_2O_3 particles. The coagulation may be caused by the formation of cross-linkage between S-PVA and α-Fe_2O_3 particles.(Received November 17, 1990)
- 1991-12-15
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