768 HWAHAK KONGHAK Vol. 41, No. 6, December, 2003, pp. 768-772 Sol-Gel - * † 320-711 26 * 302-070 88-1 (2003 7 30 , 2003 9 6 ) Preparation of Hydrophilic Inorganic-Organic Hybrid Coating Solutions by Sol-Gel Method Dong-Il Lee, Sang-Hong Jang* and Ki-Chang Song † Department of Chemical Engineering, Konyang University, 26, Nae-dong, Nonsan, Chungnam 320-711, Korea *Uri-Tech, 88-1, Pyungchon-dong, Seo-gu, Daejeon 302-070, Korea (Received 30 July 2003; accepted 6 September 2003) - Sol-Gel !"# $ %&. ’ () *#+ ,-. (Ludox)/ 0 1 2$() APS(3-aminopropyl triethoxysilane) 3 45 60%&. ,7 89:6) APS *#+ ,-.; <= >?@A) (PET) / BB C D$ E F G H# &I (J CK LD D$6 MN &. OP Q) 0R/H(pH 2, 7) APS 5 45ST 60U V/ WX"# ’ Y ST / N Z[&. \] ^ 0R /H(pH 9, 11) _‘Ta "# / V/ b] c de Z fg h03 i, j’ klB mno[&. Abstract - In order to improve the anti-fogging property of hydrophobic polymer films, inorganic-organic hybrid coating solutions with a good hydrophilic property were synthesized by the sol-gel method. The coating solutions were prepared by adding 3-aminopropyl triethoxysilane (APS) to a colloidal silica solution(Ludox). APS as a silane coupling agent forms strong bonds to the colloidal silica and surrounding polymer matrix (PET), and links two different materials together. Solutions pre- pared by the addition of APS at acidic and neutral conditions (pH 2, 7) resulted in gels which can not be used as coating solu- tions. On the other hand, those at basic conditions (pH 9, 11) resulted in coatings that were less prone to cracking and showed a good hydrophilic property. Key words: Aminopropyl Triethoxysilane, Hydrophilic, Sol-Gel Method, Inorganic-Organic, Silane Coupling Agent, Coating Solution, Silica 1. PMMA, PET PC ! "#$ % & ’( )$ *+,% -. / 0 123 45 67. $8 ! " # 9 :) ;< +=, :) >?9 +@ AB, CDE F G H IJKL M N= O 7. "P QR :)9 S@+D G T UVW$ -., 7. E 1 XYZ UV QR :) [ )N3 M\+ .]9 ^_ K‘+ UV[1] a QR Nb c : ) [ )N3 J de+@ f UV[2] g$ h.i,% 7. j UV k) QR :) [)N3 K‘+@ :)9 S@+ l $ UV ^Dm :) n%Jo [)N p K‘E %q, [)NE rUs +@ \t,D uv :)$ wxyz J{,J |+ } ~$ 7. a UV QR Nb / :) [) N3 J M de+ UV, de6 [)NE QR Ut :)$ , $ UV QR S [)N Ut$ :)$ w J{,J |7 ^~$ 7. † To whom correspondence should be addressed. E-mail: [email protected]
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HWAHAK KONGHAK Vol. 41, No. 6, December, 2003, pp. 768-772
Sol-Gel�� �� ��� �- �� � ��� ��
�������*��†
����� �����320-711 �� �� 26
*����302-070 �� �� ��� 88-1
(2003� 7� 30� ��, 2003� 9� 6� ��)
Preparation of Hydrophilic Inorganic-Organic Hybrid Coating Solutions by Sol-Gel Method
Dong-Il Lee, Sang-Hong Jang* and Ki-Chang Song†
Department of Chemical Engineering, Konyang University, 26, Nae-dong, Nonsan, Chungnam 320-711, Korea*Uri-Tech, 88-1, Pyungchon-dong, Seo-gu, Daejeon 302-070, Korea
(Received 30 July 2003; accepted 6 September 2003)
Abstract − In order to improve the anti-fogging property of hydrophobic polymer films, inorganic-organic hybrid coating
solutions with a good hydrophilic property were synthesized by the sol-gel method. The coating solutions were prepared byadding 3-aminopropyl triethoxysilane (APS) to a colloidal silica solution(Ludox). APS as a silane coupling agent forms strong
bonds to the colloidal silica and surrounding polymer matrix (PET), and links two different materials together. Solutions pre-
pared by the addition of APS at acidic and neutral conditions (pH 2, 7) resulted in gels which can not be used as coating solu-tions. On the other hand, those at basic conditions (pH 9, 11) resulted in coatings that were less prone to cracking and showed a
Fig. 1. An illustration of the structure of hydrolyzed APS when it cou-ples a PET film to a silica surface. Fig. 2. Flow chart for preparation of hybrid coating film.
Fig. 4. SEM photomicrographs of the surfaces of coating films preparedwith APS(R=0.15) added at different pH; (a) pH 9 and (b) pH 11.
Fig. 3. Photographs of contact angles with water for coating films pre-pared with APS(R=0.15) added at different pH; (a) pH 9 and (b)pH 11.
Fig. 5. Photographs of contact angles with water of the coating filmsprepared with different amounts of APS at pH 11; (a) R=0, (b)R=0.05, (c) R=0.1 and (d) R=0.15.
Table 1. The state of coating solutions prepared from different conditions.R is the weight ratio of APS to silica.
R=0 R=0.05 R=0.1 R=0.15 R=0.2
pH2 Sol Gel Gel Gel GelpH7 Sol Gel Gel Gel GelpH9 Sol Sol Sol Sol GelpH11 Sol Sol Sol Sol Gel
1. Lim, J. U., “Coating Method and the Equipment of Anti-fogging Age
Fig. 6. SEM photomicrographs of the surfaces of coating films preparedwith different amounts of APS at pH 11; (a) R=0, (b) R=0.05, (c)R=0.1 and (d) R=0.15.
Fig. 7. TEM photomicrographs of colloidal silica suspensions withoutAPS (R=0) and with APS (R=0.15).
Fig. 8. SEM photomicrograph of the cross section of coating film pre-pared from APS (R=0.15) added at pH 11.
HWAHAK KONGHAK Vol. 41, No. 6, December, 2003
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