Thermal-oxidative Aging Performance of TBIR Modified NR/BR Vulcanizates in Aircraft Tire Sidewall †

doi:10.7503/cjcu20190540

Abstract

Abstract:

The thermal-oxidative aging performance of a new generation synthetic rubber trans-1,4-butadiene-isoprene copolymer rubber(TBIR) in NR/BR vulcanizates was studied. Compared with the NR/BR vulcanizates, the crosslinking density of NR/BR/TBIR vulcanizates with 10 to 20 per hundreds of rubber(phr) TBIR improved significantly as while as the tensile properties changed little. The heat build-up reduced by 2.2—3.4 ℃ and the flexural fatigue resis-tance increased about 100%. The filler dispersion improved and the average aggregate size of the filler reduced. With the increasing of thermal-oxidative aging time, the crosslinking density of vulcanizates increased and then decreased. The crosslinking density of NR/BR/TBIR vulcanizates remained unchanged after 48 h. With the increasing of aging time, the heat build-up first decreased and then increased and NR/BR/TBIR vulcanizates has the lowest heat build-up value. The flexural fatigue lifetime of NR/BR/TBIR was better than NR/BR vulcanizates.

Key words: Natural rubber, Butadiene rubber, trans-1, 4-Butadiene-isoprene copolymer rubber, Thermal-oxidative aging, Sidewall

CLC Number:

O631

TrendMD:

GUO Qinrui, SHAO Huafeng, HE Aihua. Thermal-oxidative Aging Performance of TBIR Modified NR/BR Vulcanizates in Aircraft Tire Sidewall ^†[J]. Chem. J. Chinese Universities, 2020, 41(4): 789.

Figures/Tables 8

References 48

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m(NR)/m(BR)/m(TBIR)	M_L/(dN·m^-1)	M_H/(dN·m^-1)	M_H-M_L/(dN·m^-1)	t₁₀/min	t₉₀/min	v_r/min^-1
80∶20∶0	2.35	22.65	20.30	15.45	47.40	3.12
80∶10∶10	2.39	23.55	21.16	15.19	60.99	2.18
80∶0∶20	2.73	25.83	23.10	14.58	70.72	1.78

m(NR)/m(BR)/m(TBIR)	M_L/(dN·m^-1)	M_H/(dN·m^-1)	M_H-M_L/(dN·m^-1)	t₁₀/min	t₉₀/min	v_r/min^-1
80∶20∶0	2.35	22.65	20.30	15.45	47.40	3.12
80∶10∶10	2.39	23.55	21.16	15.19	60.99	2.18
80∶0∶20	2.73	25.83	23.10	14.58	70.72	1.78

Sample	NR/BR/TBIR(80∶20∶0)				NR/BR/TBIR(80∶10∶10)				NR/BR/TBIR(80∶0∶20)
Aging time/h	0	24	48	72	0	24	48	72	0	24	48	72
Tensile strength/MPa	21.6	23.3	19.2	19.9	22.6	21.9	21.2	19.6	21.9	22.7	20.3	18.8
Modulus at 100%/MPa	2.63	3.83	4.72	5.14	2.36	3.37	4.72	4.69	3.37	4.51	5.49	5.89
Modulus at 300%/MPa	12.2	15.6	17.0	18.5	11.0	13.4	17.5		14.3	16.8	18.8	17.2
Elongation at break(%)	491	518	350	324	553	487	372	294	468	427	330	334
Rebound(%)	47.7	50.3	48.6	48.3	46.2	48.8	48.7	47.2	46.1	48.3	48.2	47.3
Shore A hardness/(°)	71	75	77	77	73	75	77	78	73	76	77	80

Sample	NR/BR/TBIR(80∶20∶0)				NR/BR/TBIR(80∶10∶10)				NR/BR/TBIR(80∶0∶20)
Aging time/h	0	24	48	72	0	24	48	72	0	24	48	72
Tensile strength/MPa	21.6	23.3	19.2	19.9	22.6	21.9	21.2	19.6	21.9	22.7	20.3	18.8
Modulus at 100%/MPa	2.63	3.83	4.72	5.14	2.36	3.37	4.72	4.69	3.37	4.51	5.49	5.89
Modulus at 300%/MPa	12.2	15.6	17.0	18.5	11.0	13.4	17.5		14.3	16.8	18.8	17.2
Elongation at break(%)	491	518	350	324	553	487	372	294	468	427	330	334
Rebound(%)	47.7	50.3	48.6	48.3	46.2	48.8	48.7	47.2	46.1	48.3	48.2	47.3
Shore A hardness/(°)	71	75	77	77	73	75	77	78	73	76	77	80