硅烷偶联剂改性超细SiO_(2)的制备与表征  

Preparation and Characterization of Ultrafine SiO_(2) Modified by Silane Coupling Agent

作　　者：沈伟 李进 袁健 SHEN Wei;LI Jin;YUAN Jian(Eterkon Semiconductor Materials Co.,Ltd.,Kunshan 215301,Jiangsu)

机构地区：[1]昆山兴凯半导体材料有限公司,江苏昆山215301

出　　处：《有机硅材料》2023年第1期38-43,共6页Silicone Material

摘　　要：分别采用γ-巯丙基甲基二甲氧基硅烷、γ-巯丙基三甲氧基硅烷和γ-巯丙基三乙氧基硅烷对超细SiO_(2)进行表面改性,研究了硅烷偶联剂种类和用量对超细SiO_(2)亲油化度、吸水率、静态水接触角和表面羟基数的影响,采用红外光谱仪和扫描电镜分析了改性前后超细SiO_(2)的化学结构和分散性,并探讨了改性机理。结果表明,采用硅烷偶联剂对超细SiO_(2)进行表面改性后,超细SiO_(2)的亲油化度和静态水接触角升高,吸水率降低,表面羟基数减少;硅烷偶联剂选择γ-巯丙基甲基二甲氧基硅烷较佳,较佳用量为计算所得理论质量的1.5倍,此时得到的改性超细SiO_(2)性能较佳,亲油化度为62%,吸水率为29%,静态水接触角为143.9°,表面羟基数为0.48个/nm^(2),有望提高超细SiO_(2)在有机体系中的分散性及其与基体的相容性;红外光谱分析表明,改性后硅烷偶联剂包覆超细SiO_(2)并与其表面羟基发生了化学键合作用;扫描电镜分析表明未改性的超细SiO_(2)颗粒呈现出较严重的团聚情况,改性后团聚得到有效抑制。γ-mercaptopropyl methyl dimethoxysilane, γ-mercaptopropyl trimethoxysilane and γ-mercaptopropyl triethoxysilane 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-mercaptopropylme thyldimethoxysilane 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/nm^(2), 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.

关 键 词：超细二氧化硅 硅烷偶联剂 表面改性 接触角 疏水 

分 类 号：TQ127.2[化学工程—无机化工]