테트라에톡실란의 졸-겔 전이중 구조생성

노재철; 이철호

Korean Journal of Rheology, Vol.2, No.1, 53-59, June, 1990

Export Citation

테트라에톡실란의 졸-겔 전이중 구조생성

Structural Evolution during the Sol-Gel Transition of Tetraethoxysilane

노재철, 이철호

초록

물량 및 촉매를 변화시키며 TEOS 용액에 대하여 점도를 측정하였다. 염기성 촉매를 사용한 TEOS 용액은 구형 입자를 갖는 것으로 나타났다. 적은 초기 물량과 산성 촉매를 사용한 TEOS 용액은 환원 점도의 실험결과로 미루어 선형의 고분자를 갖고 있는 것으로 보인다. 반면 많은 물량과 산성 촉매를 사용한 TEOS 용액은 많은 가지 사슬을 갖는 비선형 입자를 형성하는 것으로 사료된다. 적은 물량의 산성 촉매에서 생성하는 선형 고분자 구조는 삼중 규소 연쇄의 리본 형태로 생각된다.

The viscosity was measured for a tetraethoxysilane (TEOS) solution with different water content and catalyst. A base catalyzed TEOS solution was shown to have spherical particles. An acid catalyzed TEOS solution with a low water content has been judged to form linear polymers from the analysis of reduced viscosity. However, the TEOS solution with a high water content is supposed to form highly branched polymers because the reduced viscosity is almost independent of the SiO₂ concentration. It is suggested that the formation of silicon oxides is based on a ribbon of three joined siloxane chains.

Keywords:TEOS/ Reduced viscosity/ Sol-gel/ Three chain ribbon

[References]

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[1] Sakka S, Kamiya K, Makita K, Yamamoto Y, J. Non-Cryst. Solids, 63, 223 (1984)

[2] Brinker CJ, Keefer KD, Schaefer DW, Assink RA, Kay BD, Ashley CS, J. Non-Cryst. Solids, 63, 45 (1984)

[3] Brinker CJ, Scherer GW, J. Non-Cryst. Solids, 70, 301 (1985)

[4] Sakka S, Kamiya K, J. Non-Cryst. Solids, 42, 403 (1980)

[5] Yoldas BE, J. Mater. Sci., 12, 1203 (1977)

[6] Flory PJ, "Principle of Polymer Chemistry," Cornell Univ. Press, Ithaca, NY, p. 310 (1953)

[7] Einstein A, Ann. Phys., 19, 289 (1906)

[8] Lentz CW, Inorg. Chem., 3, 574 (1964)

[9] Nogami M, Moriya Y, J. Non-Cryst. Solids, 37, 191 (1980)

[10] Stober W, Fink A, Bohn E, J. Colloid Interface Sci., 26, 62 (1968)

[11] Hirai N, Nippon Kagaku Zasshi, 76, 531 (1955)