화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.12, No.2, 93-100, June, 2000
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Interactions of methylated β-cyclodextrin and hydrophobically modified alkali-soluble emulsion (HASE) polymers: a rheological study
R.K. Gupta, K.C. Tam†, S.H. Ong, and R.D. Jenkins1
  • School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue,Republic of Singapore 639798
  • 1Technical center, Union Carbide Asia Pacific Inc., 16 Science Park Drive, # 04-01/02,The Pasteur, Republic of Singapore 118227.
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The interactions between methylated β-cyclodextrin (CD) and hydrophobically modified alkali-soluble associative polymers (HASE) were examined by a rheological technique. The effect of "capping" of hydrophobes by methylated β-cyclodextrin on the viscosity and modulus was evaluated. Model HASE polymers with C1 to C20 alkyl hydrophobic groups ethoxylated with ∼ 10 moles of ethylene-oxide (EO10) and at concentrations up to 3 wt% were examined. With the addition of methylated β-CD, the steady shear viscosity profiles shift from a Newtonian profile to one that display a shear-thinning characteristic. Significant "capping" of the hydrophobes occurs for HASE polymers with C(12), C(16) and C(20) hydrophobes as reflected by the large reduction in the viscosity. However, the steady shear viscosity remains constant when the concentration of β-CD exceeds 1 wt%, suggesting that β-CD is not able to fully encapsulate the hydrophobes of the HASE polymer. The temperature variation plots indicate that the activation energy of the HASEEO10-C(20) system and β-CD is dependent on the magnitude of the applied shear stress. These results further reinforce the hypothesis that β-CD is not able to completely remove all the hydrophobic associations.
Keywords:methylated β-cyclodextrin;associative polymers;rheology;hydrophobicity
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