Open AccessPreparation of SiO2 particles with silicone-methoxy groups on surface and its co-curing hydroxyl silicone oil
Author(s) -
Ran Zhou,
Haihong Ma,
Zhengfa Zhou,
Weibing Xu,
Fengmei Ren,
Chunhui Li
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab9bc6
Subject(s) - silicone oil , materials science , silane , composite material , silicone rubber , x ray photoelectron spectroscopy , curing (chemistry) , silicone , dielectric , silicone resin , thermogravimetric analysis , dielectric loss , polymer chemistry , chemical engineering , optoelectronics , engineering , coating
SiO 2 particles were modified by γ -aminopropyltriethoxy silane (KH550) and γ -(2,3-epoxypropoxy)propyltrimethoxy silane (KH560) in sequence to prepare SiO 2 particles with silicone-methoxy groups on surface (SiO 2 -s-Si(OCH 3 ) 3 ). X-ray photoelectron spectroscopy (XPS) and thermal gravimetric analysis (TGA) were used to characterize the modified SiO 2 particles. The SiO 2 -s-Si(OCH 3 ) 3 particles and tetramethoxysilane were used to co-cure hydroxyl silicone oil. The strong interfacial interactions between silicone rubber and fillers, which came from hydrolyzed SiO 2 -s-Si(OCH 3 ) 3 particles in situ reacting with hydroxyl silicone oil, had a great effect on the properties of composites. The mechanical properties, thermal conductivity, dielectric strength and volume resistivity of SiO 2 -s-Si(OCH 3 ) 3 /silicone rubber composites were considerably higher than that of pristine SiO 2 /silicone rubber composites at the same content of SiO 2 , while the dielectric constant and dielectric loss tangent of SiO 2 -s-Si(OCH 3 ) 3 /silicone rubber composites was lower than that of pristine SiO 2 /silicone rubber composites at the same content of SiO 2 .