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Sol-Gel법에 의해 제조된 실리카 졸의 방사성과 유변학적 특성 (I)물량 및 촉매효과
Spinnability and Rheological Properties of Silica Sols Prepared by the Sol-Gel Method (I) Effects of H2O Content and Catalysts
HWAHAK KONGHAK, June 1996, 34(3), 389-394(6), NONE
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Abstract
Sol-Gel법에 의해 제조된 실리카 졸의 유변학적 특성을 출발용액의 물량 및 촉매 종류의 함수써 조사하였다. 염산 촉매하에서 적은 양의 물[H2O/Si(OC2H5)4=2]로 제조된 실리카 졸은 10P이상의 고점도 상태에서 뉴튼유체거동을 보였고 섬유의 인출이 가능하였다. 반면에 많은 양의 물[H2O/Si(OC2H5)4=15]이나 수산화암모늄 촉매하에서 제조된 실리카 졸은 10P이상의 고점도 상태에서 Thixotropic거동을 보였으며 방사성을 보여주지 못했다.
The rheological properties of silica sols prepared from the Sol-Gel method have been investigated as a function of H2O content and the types of catalysts of the starting solution. The silica sol with a small water content[H2O/Si(OC2H5)4=2] under HCI catalyst shows a Newtonian behavior and a spinnability above the viscosity of 10P. On the other hand, the silica sol hydrolyzed with a large water content [H2O/Si(OC2H5)4=15] or catalyzed by NH4OH exhibits a thixotropic behavior and no spinnability even though the viscosity is high enough (above 10p).
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