The thermal oxidative degradation and ageing performance of silicone rubber filled with attapulgite
- Accepted Date: 2020-07-02
Abstract: The natural attapulgite (NAPT) was disaggregated by high-pressure homogenization technology combined with extrusion process to prepare the APT with disaggregated rod crystal bundles (DAPT) and larger specific surface area 133.7 m2?g-1. NAPT and DAPT were incorporated into the silicone rubber to obtain the composite NAPT-SR and DAPT-SR by mechanical blending method. After thermal oxidative ageing at 300 oC for 0.5 h, the 5% weight loss temperature of the rubber composites increased greatly from 385 oC of the neat silicone rubber to 396-399 oC with addition of NAPT and DAPT. NAPT and DAPT enhanced the interaction between the silica nanoparticles and rubber matrix thus inhibited the nanoparticle agglomeration. The conservation rate of the side methyl group in NAPT-SR and DAPT-SR was greatly improved after ageing. Therefore, the thermal oxidative degradation and ageing performance of the silicone rubber composites was significantly reinforced. Moreover, DAPT could greatly restrain the growth of nanoparticles after ageing, therefore, show the better retention of tensile strength (40.6%), elongation at break (34.9%) and tear strength (30.1%) compared with the corresponding mechanical properties of the neat silicone rubber (10.6%, 7.4% and 5.0%) after ageing.
|Citation:||lingjun Chou. The thermal oxidative degradation and ageing performance of silicone rubber filled with attapulgite[J]. Chinese Journal of Chemical Physics .|