Ugi反应海藻酸衍生物协同疏水改性高岭土稳定Pickering乳液的制备

doi:10.13218/j.cnki.csdc.2015.04.002

Abstract

Abstract: Amphiphilic alginate derivative (Ugi-Alg) was prepared via Ugi reaction of hydrophobically modified sodium alginate (Alg).The kaolin (KL) particle's surface was hydrophobically modified with dry ball milling method,using poly (methyl hydrosiloxane) (PMHS) as hydrophobic modifying agent.Then the properties of the modified products were characterized by FTIR,¹HNMR,contact angle measurement,laser particle size measurement and Zeta potential analyzer.The stable Pickering emulsions were prepared by the modified kaolin (MKL) in cooperation with Ugi-Alg and effects of pH of the water phase on the morphological characteristics and the emulsions' droplet size of the Pickering emulsions were investigated.Experimental results showed that the hydrophobic modification of Alg by Ugi reaction is successful.PMHS is adsorbed on the surface of KL under the mechanical action of the ball milling,making MKL become the active particle with high hydrophobic property.Ugi-Alg is coordinately adsorbed on the particle's surface of MKL under action of ultrasonic wave,changing the wettability of MKL particles' surface,which could effectively improve the stability of the Pickering emulsions.As the raising of pH of the water phase,droplet size of the MKL/Ugi-Alg Pickering emulsions is gradually declined.When the pH achieves 10.32,the emulsions' droplet size reaches 7.4 μm.

Key words: Pickering emulsions, Ugi reaction, alginate derivative, modified kaolin

CLC Number:

O648.2+3

CHEN Xiu-qiong, YAN Hui-qiong, LI Jia-cheng, FENG Yu-hong, SHI Zai-feng, WANG Xiang-hui, LIN Qiang. Preparation of stable Pickering emulsions by alginate derivative prepared via Ugi reaction in cooperation with hydrophobically modified kaolin[J].China Surfactant Detergent & Cosmetics, 2015, 45(4): 185-190.

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Preparation of stable Pickering emulsions by alginate derivative prepared via Ugi reaction in cooperation with hydrophobically modified kaolin

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