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- Title
硅烷偶联剂改性超细 SiO<sub>2</sub> 的制备与表征.
- Authors
沈 伟; 李 进; 袁 健
- Abstract
γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropyltrimethoxysilane and γ-mercaptopropyltriethoxysilane were used to respectively modify the surface of ultrafine SiO 2• The effects of the types and content of the coupling agent on the degree of lipophilicity, water absorption, static water contact angle and surface hydroxyl number of ultrafine SiO 2 were investigated. The chemical structure and dispersion of ultrafine SiO 2 before and after modification were analyzed by infrared spectrometer and scanning electron microscope, and the modification mechanism was discussed. The results showed that after surface modification of ultrafine SiO 2 with silane coupling agent, the lipophilicity and static water contact angle of ultrafine SiO 2 increased, the water absorption rate decreased, and the number of surface hydroxyl groups decreased. γ-mercaptopropylmethyldimethoxysilane is a good silane coupling agent, and the preferred dosage was 1.5 times of the calculated theoretical mass. At this condition, the modified ultrafine SiO 2 performance was better, the degree of lipophilicity was 62%, and the water absorption rate was 29%, the static water contact angle was 143. 9°, and the number of surface hydroxyl groups was 0. 48/ nm², which was expected to improve the dispersion and compatibility of ultrafine SiO 2 in organic systems. The coupling agent coated ultrafine SiO 2 had a chemical bond with surface hydroxyl group of ultrafine SiO 2• The scanning electron microscope analysis indicated that the unmodified ultrafine SiO 2 particles showed serious agglomeration, which was effectively suppressed after modification.
- Subjects
SILANE coupling agents; CONTACT angle; CHEMICAL bonds; CHEMICAL structure; SCANNING electron microscopes; LIPOPHILICITY
- Publication
Silicone Material, 2023, Vol 37, Issue 1, p38
- ISSN
1009-4369
- Publication type
Article
- DOI
10.11941/j.issn.1009-4369.2023.01.007