The Effect of Metallic Oxides on the Formation Rates and Rigidities of the Elastic Sodium Alginate-$CaSO_4{\cdot}1/2H_2O$ Gel.

Sodium Alginate-$CaSO_4{\cdot}1/2H_2O$ 彈性體의 生成速度 및 彈性에 미치는 金屬酸化物의 影響

  • Shin, Hong-Dae (Department of Chemistry, Pusan National University) ;
  • Huh, Yeonn (Department of Chemistry, Pusan National University) ;
  • Kim, Uun-Sik (Department of Chemistry, Pusan National University)
  • 신홍대 (釜山大學校 文理科大學 化學科) ;
  • 허연 (釜山大學校 文理科大學 化學科) ;
  • 김은식 (釜山大學校 文理科大學 化學科)
  • Published : 19650300


The time-lag-effect of alkali salts on the gelation of sodium alginate-$CaSO_4{\cdot}$1/2 $H_2O$ is compared with Miyake's data, and then the formation rate of the elastics measured by the continuous method (an improved Schwedoff's method) and the change of rigidity with metallic oxides are studied as follows: (1) The gelation processes of sodium alginate and $CaSO_4{\cdot}$1/2 $H_2O$-aqueous sol are studied by measuring, continuously the increases of tensions ofsamples. (2) The time-lag-effect of $Na_3PO_4$ on the formation rate of the elastic gel is larger than that of $Na_2CO_3$, but the difference between the effects of the two alkali salts on the rate is found not so greater than predicted in Miyake's data. (3) Any regularities of the effect on the rate by metallic oxides are not observed. The increasing effects of the rates of $SiO_2$ and MgO are relatively large, and that of ZnO is relatively small. However, $Al_2O_3$, $Sb_2O_3$ and $TiO_2$show some decreasing effects. As a result it is noted that the regularities do not depend on the effect of oxide species and their amounts. (4) It is not found proportionality between the rigidity and the gelation rate. However, the increasing effect of the rigidity with the addition of metallic oxides can be observed. The rigidity increasing rate of MgO is the largest of them.



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