Abstract
The self-healing composites were prepared from the combination of bromobutyl rubber (BIIR) and natural rubber (NR) blends filled with carbon nanotubes (CNT) and carbon black (CB). To reach the optimized self-healing propagation, the BIIR was modified with ionic liquid (IL) and butylimidazole (IM), and blended with NR using the ratios of 70:30 and 80:20 BIIR:NR. Physical and chemical modifications were confirmed from the mixing torque and attenuated total reflection-fourier transform infrared spectroscopy (ATR-FTIR). It was found that the BIIR/NR-CNTCB with IL and IM effectively improved the cure properties with enhanced tensile properties relative to pure BIIR/NR blends. For the healed composites, BIIR/NR-CNTCB-IM exhibited superior mechanical and electrical properties due to the existing ionic linkages in rubber matrix. For the abrasion resistances, puncture stress and electrical recyclability were examined to know the possibility of inner liner applications and Taber abrasion with dynamic mechanical properties were elucidated for tire tread applications. Based on the obtained Tg and Tan δ values, the composites are proposed for tire applications in the future with a simplified preparation procedure.
Highlights
Investigations on elastomers for tire application have been attractive in the field of materials research over the past several decades
Physical and chemical interactions among ionic liquid (IL) and IM molecules and the BIIR/natural rubber (NR) molecular chains are clarified from the mixing torque and ATR-FTIR of the compounds and vulcanizates
The self-healing composites based on modified-BIIR and NR-CNTCB composites are successfully prepared using three steps of mixing through an internal mixer and a two-roll mill
Summary
Investigations on elastomers for tire application have been attractive in the field of materials research over the past several decades. Many types of natural rubber (NR) [1] and synthetic rubber (SR) have been investigated such as styrene-butadiene rubber (SBR) [2], butadiene rubber (BR) [3] and their blends including NR/SBR, SBR/BR and NR/BR/SBR [4,5,6]. This is attributed to the superior elasticity and flexibility of NR and BR [7,8] along with the SBR which has well rolling properties and wet fraction due to π–π interaction of existing benzene ring in the molecular structure [9]. The combination of CB/CNT with rubber exhibits superior mechanical, dynamical and electrical properties due to the three-dimensional networks of both fillers in the rubber matrix [23]
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