W/O형 Decamethylcyclopentasiloxane (cyclomethicone) 에멀젼의 유변학적 특성에 관한 연구

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은빈 담
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3 이論文을崔敏亨의碩士學位論文으로認定함 2004 年 2 月主審副審委員

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10 G *

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12 G * - ix -

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17 oil water water oil oil (a) (b) - 5 -

18 Nm/m 2-6 -

19 2πR γ cosθ = πr 2 h ρ g γ = Rh ρ g 2cosθ γ = 1 2 Rh ρ g - 7 -

20 γ = F 4πR ( a ) = 4b π 2 1 R 2 F 4πR (ρ 1 ρ 2 ) +( r/r ) ρ 1 ρ 2 sec 2 m - 8 -

21 γ = φmg 2πr = φvρg 2πr 2r θ h (a) (b) F 2r R (c) (d) - 9 -

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23 n l = ( 2N l 3 m )exp [ ( 2 3 )( l l m ) 3 ]l

24 l m l n l l

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29 γ γ γ γ γ γ γ

30 Bingham plastic Pseudo plastic Shear stress Newtonian Dilatant Shear rate

31 σ = G σ 0 J (t ) = γ (t ) σ

32 J (creep compliance) Jc B C D Jr A E 0 T = t creep Time (sec)

33 γ (t ) = γ 0 coswt σ (t ) = σ 0 cos (wt + )

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35 (16)

36 Decamethylcyclopentasiloxane(KF995, Shinetusu) 를사용하였다. 비이온실리콘계계면활성제로친유성계면활성제인 Cetyl PEG/PPG 10/1 Demethicone(Cetyl Demethicone Copolyol, ABIL EM90, Goldschmidt) 와친수성계면활성제인

37 O Si O Si Si O Si O Si O sio sio sio si (CH)

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39 Oil phase (Cyclomethicone, Surfactant) Aqueous phase 5.2 ml/min by micro tube pump Emulsification with Homogenazer (25,2000 RPM) Parents emulsion Dilution of parents emulsion

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43 Surface tention (mn/m) KF-6011 mass fr C.M.C Concentration of surfactant (wt %)

44 50 40 Interfacial tension(mn/m) Concentration of surfactant(wt%)

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46 (a) (b) (c) (d) (e) (f) (a) (b) (c) (d) (e) (f)

47 (a) (b) (c) (d) (e) (f)

48 Droplet mean size (um) water 80% water 70% water 60% Concentration of surfactant (wt%)

49 (a) (b) (c) (d) (e) (f)

50 Droplet mean size (um) water 80% water 70% water 60% Mass fraction of KF6011 in mixed surfactant

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52 Viscosity (Pa s) surf. wt% Shear stress (Pa)

53 Viscosity (Pa s) % water vol% 70% 60% 50% 30% 10% Shear stress (Ps)

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55 Viscosity (Pa s) surf. 1.0 wt%, water60% surf. 2.0 wt% surf. 3.0 wt% surf. 1.0 wt%, water70% surf. 2.0 wt% surf. 3.0 wt% surf. 1.0 wt%, water80% surf. 2.0 wt% surf. 3.0 wt% Shear stress (Pa)

56 surf. 1.0 wt% surf. 2.0 wt% surf. 3.0 wt% Viscosity (Pa s) Water volume fraction

57 Relative viscosity surf. 1.0 wt% surf. 2.0 wt% surf. 3.0 wt% - Choi & Schowalter model... taylor model Water volume fraction

58 G * G *

59 G * 100 G * (Pa) 10 1 surf. 3% surf. 2% surf. 1.5% surf. 0.5% Shear stress (Pa) G *

60 Compliance (1/Pa) water 80% water 70% water 60% E time (sec) G *

61 Viscosity (pa s) 10 1 I II III Shear stress (Pa)

62 0.10 Compliance (m1/pa) Pa 1.5Pa time (sec) [I] 4.0 Compliance (1/Pa) Pa 5Pa time (sec) [II] Pa 20 Pa Compliance (1/Pa) time (sec) [III]

63 Viscosity (Pa s) I II III Shear stress (Pa)

64 Pa 2Pa Compliance (m1/pa) time (sec) Pa 5Pa Compliance (1/Pa) time (sec) Compliance (1/Pa) Pa 20Pa time (sec)

65 Viscosity (Pa s) Shear stress (Pa) 0.0 KF-6011 mass fr

66 Viscosity (KPa s) E-3 1E KF-6011 mass fr Shear stress (Pa)

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68 water 80% water 70% water 60% Viscosity (Pa s) Shear stress (Pa)

69 complex modulus (Pa) [Ⅰ] [Ⅱ] [Ⅲ] Mass fr. of KF-6011 in mixed surfactant is 0.3 Mass fr. of KF-6011 in mixed surfactant is Shear stress (Pa) G * G * G *

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71 Viscosity (KPa S) E-3 1E-4 [Ⅰ] [Ⅱ] [Ⅲ] Mass fr. of KF-6011 in mixed surfactant is 0.0 Mass fr. of KF-6011 in mixed surfactant is Shear stress (Pa)

72 1000 Compliance (1/Pa) water 60% water 60% (mixed surfactant) water 70% water 70% (mixed surfactant) water 80% water 80% (mixed surfactant) Time (sec)

73 0.0 KF-6011 mass fr. 0.3 Compliance (1/Pa) Time (sec) 0.0 KF-6011 mass fr Compliance (1/Pa) Time (sec) 0.0 KF-6011 mass fr Compliance (1/Pa) Time (sec)

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75 1. 계면활성제의농도가증가할수록연속상인오일 solution의표면장력과분산상인물과의계면장력이감소하는것을알수있었다. 이때계면활성제의농도가 0.25 wt% 일때 critical함을알수있었다. 2. 계면활성제의농도가증가할수록 droplet mean size는작아지는것을볼수있었다. 또한 droplet mean size의점도에대한영향은분산상인물의농도가상대적으로작을때줄어든다는것을알수있었다. 3. 상대적으로분산상의농도가높을때강한 shear thinning 현상 을관찰할수있었다. 또한 droplet mean size 가감소할수록에멀

76 젼의점도는증가하게되고 shear thinning 되는정도또한증가한다는것을알수있었다. 혼합유화제를사용한경우에멀젼의점도는그렇지않은경우보다더증가하게되고 shear thinning 되는정도또한증가한다는것을알수있었다. 4. 에멀젼의상대점도는 Choi and Schowalter model 에의해상 당히잘예측된다는것을알수있었다

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81 감사의글 길고도짧았던 2년동안의석사과정기간동안부족하지만논문을쓸수있게도움을주신많은분들께진심으로감사의말씀을전합니다. 먼저학부 4학년때부터대학원졸업시까지저를성심성의껏지도해주시고조언을아끼지않으신지도교수님인장윤호교수님께깊은감사의마음을전합니다. 그리고부족한논문을잘봐주신최순자교수님과노경호교수님께도감사드립니다. 또한석사과정동안조언을해주신인하대학교화학공학과교수님들께도감사의마음을전합니다. 학부 4학년때부터석사과정동안인하대학교화학공학과표면및계면공학연구실에서같이연구를하고많은도움을주신선배님과동기그리고후배에게감사드립니다. 대학원생활의전반적인도움과사회생활을위한조언을아끼지않으신강현섭선배, 이한철선배, 남상인선배, 이훈선배와같은대학원동기인준식이그리고동기로서 1년늦게입학했지만실험실업무에너무열심인동권, 지금신입생으로들어와앞으로실험실을이끌정수에게감사합니다. 95년인하대학교화학공학과에입학했을때부터같이지내며도움과조언을주었던화학공학과 95학번친구들에게감사드립니다. 너무도편안하게고민을털어놓으며술을마셨던동준이, 송기, 영수, 정식이, 싫은소리를해도화를내지않는명석이, 같이생활했던진구, 성일, 동권, 순구, 정환, 원중, 윤호에게감사드립니다. 마지막으로저를믿고지금의제모습을있게해주신저의부모님께감사의마음을전합니다. 항상지금처럼건강하시고받은만큼보답하지는못하겠지만여느자식못지않게효도하면서아끼면서부모님즐겁게해드리겠습니다. 부족하지만저의대학 4년과석사과정 2년의결과물인이논문을사랑스러운부모님과지형이에게바치면서감사의글을마치겠습니다. 작성자 : 최민형

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