Abstract:
Acrylonitrile-butadiene rubber (NBR) filled with Ferric (Ⅲ) Sulfate (Fe
2(SO
4)
3) particles were prepared by planetary ball-mill method and the average size of Fe
2(SO
4)
3 particles decreased from 10.23
μm to 1.13
μm. Electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS) indicated that the coordination reaction occurred between nitrile groups (-CN) of NBR and ferric ions (Fe
3+) of Fe
2(SO
4)
3. Scanning electron microscope (SEM) indicated that a layer of "creases" appeared around the Fe
2(SO
4)
3 and NBR after hot pressing, which was due to the coordination effect between Fe
2(SO
4)
3 particles and NBR matrix. This phenomenon resulted in the enhancement of compatibility of the interface. The glass transition temperature (
Tg) and crosslinking density of composites increased with the rise of Fe
2(SO
4)
3 content. The comprehensive mechanical properties of composite filled with 15 phr (parts per hundred of rubber) Fe
2(SO
4)
3 were the best. The tensile strength of composite filled with 15 phr Fe
2(SO
4)
3 increased by 12.8 times compared with that of pure NBR. Although the coordination ability of Fe
2(SO
4)
3 was limited, non-coordination Fe
2(SO
4)
3 particles had the effect of physical enhancement of NBR when the loading of Fe
2(SO
4)
3 rose to 30 phr. The tensile strength of composite filled with 30 phr Fe
2(SO
4)
3 was about 1.41 times larger than that of composite filled with 15 phr Fe
2(SO
4)
3 while elongation at break decreased only a little. The crosslinking density, tensile strength, hardness, rebound resilience, tension fatigue factor and ageing-resistant performance of composite filled with 15 phr Fe
2(SO
4)
3 prepared by planetary ball-mill method were better than those of composite prepared by dry method, which indicated that the solution ball-mill method was better than the traditional dry method. However, the energy consumption of planetary ball-mill method was higher than that of dry method. It is an important research direction in the future to reduce the energy consumption of planetary ball-mill method.