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纳米SiO2水体系

POLYMER INTERNATIONAL · 2018 ·Vol. 68 ·期 4 ·675-683 · IF 2.352

Photopolymerization synthesis of polyacrylic acid dispersant with methoxysilicon end groups and its application in a nano-SiO2 aqueous system

Bing Yang,Yu Zhou,Wenjie Yu,Song Zhang,Hongxiang Chen,Ju Ye

In order to improve the dispersity and stability of the nano-SiO 2 aqueous system with high solid content, a kind of polyacrylic acid dispersant with methoxysilicon end groups (KH590-PAA) was synthesized by photopolymerization of acrylic acid (AA) initiated with (3-mercaptopropyl)trimethoxysilane (KH590). After adding KH590-PAA into the nano-SiO 2 aqueous dispersion system (20 wt% solid content), the viscosity and the curing time of the system were measured with a rotational viscometer and the inverted bottle method. Moreover, the dispersion mechanism of KH590-PAA for the nano-SiO 2 aqueous system was researched by measuring the adsorption capacity, the particle size and the zeta potential of the nanoparticles with a conductivity meter, dynamic light scattering, SEM and TEM, respectively. The results showed that the methoxysilicon groups in KH590-PAA could react with hydroxyl groups on the surface of nano-SiO 2 in the process of stirring, which enhanced the adsorption capacity of the dispersant and then increased the surface charge of the particles. Therefore, electrostatic repulsion and steric hindrance effects between the SiO 2 nanoparticles could be further enhanced by adding the KH590-PAA dispersant, and then the nano-SiO 2 aqueous system exhibited better dispersity and stability. Besides, the dispersion properties of SiO 2 nanoparticles in water were closely related to the addition amount and the molecular weight of the KH590-PAA dispersant. © 2018 Society of Chemical Industry

CAS / MDL: 4420-74-0 7631-86-9 107-03-9

研究领域: 材料科学 · 化学工程

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JOURNAL OF APPLIED POLYMER SCIENCE · 2019 ·Vol. 137 ·期 17 ·48617 · IF 2.188

Acrylic acid/allyloxy polyethylene glycol copolymer with methoxysilicon end groups as a highly effective dispersant for nano-SiO2 aqueous system

Bing Yang,Yu Zhou,Hongxiang Chen,Song Zhang,Jingyi Liu

In order to improve the dispersity and stability of nano-SiO 2 aqueous system with high solid content, acrylic acid/allyloxy polyethylene glycol copolymer dispersants with methoxysilicon end groups (KH590-AA x -APEG y ) were synthesized by photopolymerization. After adding KH590-AA x -APEG y into the nano-SiO 2 aqueous system, the viscosity, the curing time, the particle size, and the zeta potential of these systems were respectively measured. The results showed that introducing polyethylene glycol chain into the dispersant was beneficial to better exerting its electrostatic repulsion and steric hindrance effects and further improving the dispersibility of the nano-SiO 2 aqueous system. Moreover, the dispersion stability of SiO 2 nanoparticles in water was closely related to the composition, the molecular weight, and the addition amount of KH590-AA x -APEG y and the solid content. When the molecular weight of KH590-AA x -APEG y was 3200 g mol −1 and its addition amount was 0.1 wt %, the nano-SiO 2 aqueous system with 20 wt % solid content showed the best dispersity and stability. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48617.

研究领域: 材料科学 · 化学工程

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