Abstract
With the aim of improving the anti-aging properties of nitrile-butadiene rubber (NBR), a functional organic filler, namely LDH–SAS, prepared by intercalating 4-amino-benzenesulfonic acid monosodium salt (SAS) into layered double hydroxides (LDHs) through anion exchange, was added to nitrile-butadiene rubber (NBR), giving the NBR/LDH–SAS composites. Successful preparation of LDH–SAS was confirmed by XRD, TGA and FTIR. LDH–SAS was well dispersed in the NBR matrix, owing to its strong interaction with the nitrile group of NBR. The obtained NBR/LDH–SAS composites exhibited excellent thermo-oxidative aging resistance as shown by TGA-DSC. Further investigation by ATR-FTIR indicated that SAS can capture the radical groups, even during the aging process, which largely accounts for the improved aging resistance.
Highlights
Nitrile-butadiene rubber (NBR) is a synthetic rubber widely used for various applications, such as seals in the aerospace, automotive and oil petroleum industries [1,2,3]
For nitrile-butadiene rubber (NBR)/layered double hydroxides (LDHs)–SAS composites with 5 phr of LDH–SAS, both the retention of tensile strength and elongation at failure were higher than those of the unmodified NBR and NBR/LDH–NO3 composites with 5 phr of LDH–NO
During processing, which improved the interactions between the filler and the NBR matrix
Summary
Nitrile-butadiene rubber (NBR) is a synthetic rubber widely used for various applications, such as seals in the aerospace, automotive and oil petroleum industries [1,2,3]. Like surface functionalization and hybrid and organic intercalation, can enhance these interactions [7,21,22,23,24,25,26,27] In this context, layered double hydroxides (LDHs), known as anionic clays, have received attention in recent years as a functional filler to improve mechanical, flame-retardant and thermal stability properties of polymers [28,29,30,31,32]. A drawback in this work is that the grafting reaction is hard to control and the LDHs are over grafted, which might lead to compromised anti-aging performance of the filler For this reason, a different method is desirable to provide a more controllable and stable route for LDHs to function to improve the anti-aging properties of NBR. This work sets the stage for future work on preparing rubber composites with high anti-aging ability and more environmentally friendly characteristics
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