Structure and Properties of Sidewall Compounds for Aircraft Tyre Modified by TBIR

Trans-1, 4-poly (butadiene-co-isoprene) copolymer rubber (TBIR) was used to modify nature rubber(NR)/butadiene rubber (BR) blends for sidewall compounds in aircraft tyre, and the crystalline behavior, mechanical properties and vulcanization characteristics of the NR/BR/TBIR compounds, physical and mechanical properties, dynamic mechanical properties and filler dispersion of the NR/BR/TBIR vulcanizates were studied in details. The results indicate that the incorporation of crystalline TBIR endows the NR/BR/TBIR compounds higher green strength and Young' s modulus. Blending TBIR with NR/BR, the optimum curing time(t) and the crosslinking density of the compounds increased. The NR/BR/TBIR m (NR)/m(BR)/m(TBIR) = 80/10/10, 80/0/201 vulcanizates with TBIR incorporation showed 7% higher of 300% modulus, 35% 50% higher of flexural fatigue resistance and reduced rolling resistance compared with NR/BR vulcanizate. NR/BR/TBIR (80/10/10) vulcanizate presented better comprehensive properties with improved thermo-oxidative ageing resistance. With the extension of curing time, modulus at 100% of NR/BR/TBIR(80/10/10) vulcanizate was above 18% higher than NR/BR (80/20) vulcanizate. Flexural fatigue resistance of NR/BR vulcanizate was reduced by 60%, while only 50% of NR/BR/TBIR (80/10/10) vulcanizate. The NR/BR/TBIR vulcanizate showed reduced rolling resistance(8%-14% lower) and unchanged wet skid resistance. The filler dispersion improved with reduced filler aggregate size. NR/BR/TBIR (80/10/10) vulcanizate had good resistance to the longer curing time.