| Effect of Silica Modified by Organic Wet Process on Properties of NR Composites |
| Received:April 29, 2020 Revised:April 29, 2020 |
| DOI：10.12136/j.issn.1000-890X.2020.11.0803 |
| Key Words: silica；modification；coupling agent；ionic liquid；NR；composite；dispersion；dynamic mechanical property |
| Author Name | Affiliation | | WANG Binghui | Guizhou University | | WANG Kuiye | Guizhou University | | XIONG Yuzhu* | Guizhou University； Guizhou Province Engineering Laboratory for Rubber Composites |
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| Abstract: |
| Modified silica/natural rubber（NR） composite materials were prepared by using the silica modified by bis-[3-（triethoxysilyl） propyl]-tetrasulfide（coupling agent Si69），ionic liquid 1-butyl-3-methylimidazole hexafluorophosphate（BMI） and ionic liquid 1-allyl-3-methylimidazole chloride（AMI）， respectively．The effects of modifier on the microstructure，vulcanization properties，physical properties and dynamic mechanical properties of the modified silica/NR composite were investigated．The results showed that the particle size of the modified silica decreased significantly，the dispersion of the modified silica in the rubber matrix was improved，and the interaction between the modified silica and rubber matrix was enhanced．The curing rate of the modified silica/NR composite was accelerated，and the physical properties were significantly improved．Compared with the coupling agent Si69，the two ionic liquids significantly improved the curing efficiency and physical properties of the modified silica/NR composite．Under the same strain or high frequency，the energy storage modulus of the composite decreased in the following order of fillers：AMI modified silica，BMI modified silica，coupling agent Si69 modified silica，and unmodified silica． AMI modified silica/NR composite had the best overall performance． |
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