Modification of SSBR/BR with Trans-1,4-Polyisoprene Alloy Rubber for High Performance Passenger Car Radical Tire Tread Stock†

doi:10.7503/cjcu20170152

Abstract

Abstract:

The crystalline characteristics, processing and mechanical properties of trans-1,4-polyisoprene alloy rubber(TPIR) were studied. Then TPIR incorporated with solution polymerized butadiene-styrene rubber(SSBR)/cis-1,4-polybutadiene rubber(BR) blends were further investigated as passenger car radical(PCR) tire tread stocks. Compared with amorphous SSBR and BR, TPIR raw rubber showed improved green strength due to its crystallizability at room temperature. The capillary extrusion behavior of TPIR indicated that TPIR presented good extrusion behavior with smooth extrusion appearance and low extrusion swelling ratio. SSBR/BR/TPIR compounds showed increased green strength and 100% modulus with the increase in TPIR, when compared with SSBR/BR blends. After vulcanization, SSBR/BR/TPIR vulcanizes showed excellent physical and mechanical properties, such as increased wet skid resistance, wear resistance, compressive strength, and outstanding tensile fatigue resistance(increased by more than 4 times). Carbon blacks and silica were proved to be dispersed much more uniformly in SSBR/BR/TPIR vulcanizates with much smaller aggregates than in SSBR/BR vulcanizates. So comprehensive speaking, TPIR as a novel synthetic rubber has the potentional application in PCR tire tread stock with superor performance.

Key words: Trans-1,4-polyisoprene alloy rubber, Butadiene-styrene rubber/cis-1,4-polybutadiene rubber blend, High performance tire, Tread stock, Wet skid resistance, Wear resistance, Butadiene-styrene rubber, cis-1,4-Polybutadiene rubber

CLC Number:

O631.1⁺1

TrendMD:

WANG Hao, ZHANG Jianping, MA Yunsheng, WANG Riguo, HE Aihua. Modification of SSBR/BR with Trans-1,4-Polyisoprene Alloy Rubber for High Performance Passenger Car Radical Tire Tread Stock^†[J]. Chem. J. Chinese Universities, 2017, 38(11): 2095.

Figures/Tables 11

Table 1 Rubber amount in SSBR/BR/TPIR(phr)

SSBR 4526	75	75	75	70	50
BR 9000	25	15	5	0	0
TPIR-04	0	10	20	30	50

Fig.1 Curves of DSC(A) and stress-strain(B) of TPIR-04(a), SSBR(b) and BR raw rubbers(c) Inset of (B): enlarged stress-strain curves of SSBR(b) and BR(c) raw rubber

Fig.2 Capillary extrusion behavior of TPIR(a), SSBR(b) and BR(c)(A) Shear viscosity(η) versus shear rate(γ); (B) die swell ratio versus γ. Insets images in (A): extrusion morphologies of SSBR and BR raw rubbers. Insets images in (B): extrusion morphologies of TPIR raw rubbers.

Fig.3 DSC curves(A) and stress-strain curves(B) of SSBR/BR/TPIR-04 compoundsm(SSBR):m(BR):m(TPIR-04): a. 75:25:0; b. 75:15:10; c. 75:5:20; d. 70:0:30; e. 50:0:50.

Table 2 Properties of SSBR/BR/TPIR vulcanizates

m(SSBR):m(BR):m(TPIR-04)	75:25:0	75:15:10	75:5:20	70:0:30	50:0:50
ML/(dN·m^-1)	2.58	2.25	2.15	2.05	2.15
MH/(dN·m^-1)	16.46	15.08	15.01	15.70	19.05
t₁₀/min	5.18	5.31	5.18	5.18	4.33
t₉₀/min	12.27	12.37	12.06	12.30	9.38
Vc/min^-1	14.10	14.16	14.53	14.05	19.80
10⁴Crosslink density/(mol·cm^-3)	1.21	1.23	1.28	1.35	1.49
Compressive strength/MPa	1.17	1.30	1.29	1.36	1.85
Tensile Strength/MPa	20.6	19.7	19.6	18.8	18.8
Modulus at 100%/MPa	2.42	2.38	2.58	2.55	3.39
Modulus at 300%/MPa	10.0	10.1	10.6	10.5	13.0
Elongation at break(%)	540	530	510	494	419
Tear strength/(kN·m^-1)	53.9	48.0	51.7	47.3	48.4
Hardness(Shore A)	64	64	65	67	73
Rebound(%)	24	20	16	15	21
DIN Abrasion/(cm³·40 m^-1)	0.175	0.160	0.164	0.170	0.145
Heat built-up/℃	22.5	23.2	22.8	23.4	25.0
10^-4Tensile fatigue life/times	150	810	860	690	720
Tensile strength/MPa	19.6	19.1	19.0	18.4	19.0
Elongation at break(%)	436	413	415	349	321
Ageing coefficient(%)	76.8	75.5	78.9	69.1	77.4

Fig.4 DSC curves of SSBR/BR/TPIR-04 vulcanizatesm(SSBR):m(BR):m(TPIR-04): a. 75:25:0; b. 75:15:10; c. 75:5:20; d. 70:0:30; e. 50:0:50.

Fig.5 Loss factor(tanδ) versus temperature of SSBR/BR/TPIR-04 vulcanizatesm(SSBR):m(BR):m(TPIR-04): a. 75:25:0;b. 75:15:10; c. 75:5:20; d. 70:0:30.

Fig.6 Filler dispersion images of SSBR/BR/TPIR-04 vulcanizatesScan size: 2.2 mm×1.6 mm. m(SSBR):m(BR):m(TPIR-04): (A) 75:25:0; (B) 75:15:10; (C) 75:5:20;(D) 70:0:30; (E) 50:0:50.

Table 3 Filler dispersion and mean aggregate size of SSBR/BR/TPIR-04 vulcanizates

m(SSBR):m(BR):m(TPIR-04)	75:25:0	75:15:10	75:5:20	70:0:30	50:0:50
Dispersion(%)	77.4	89.0	86.3	86.8	89.5
Mean aggregate size/μm	13.8	12.0	11.9	11.6	11.7

Fig.7 TEM images of SSBR/BR/TPIR-04 vulcanizatesm(SSBR):m(BR):m(TPIR-04): (A) 75:25:0; (B) 75:15:10; (C) 75:5:20.

Fig.8 Properties radar map of SSBR/BR/TPIR-04 vulcanizates

References 25

[1]	Castellano M., Conzatti L., Costa G., Falqui L., Turturro A., Varbara V., Negroni F., Polymer,2005, 46(3), 695-703
[2]	Wang M. J., Lu S. X., Mahmud K., J. Polym. Sci. Polm. Phys., 2015, 38(9), 1240-1249
[3]	Liu X., Zhao S. H., J. Appl. Polym. Sci., 2010, 108(5), 3038-3045
[4]	Thaptong P., Sae-Oui P., Sirisinha C., J. Appl. Polym. Sci., 2016, 133(17), 1-8
[5]	Wang Y. X., Wu Y. P., Li W. J., Zhang L. Q., Appl. Surf. Sci., 2011, 257(6), 2058-2065
[6]	Liu X., Zhao S. H., Yang Y., Zhang X. Y., Wu Y. P., Polym. Advan. Technol., 2009, 20(11), 818-825
[7]	Liu X., Zhao S. H., Zhang X. Y., Li X. L., BaiY., Polymer,2014, 55(8), 1964-1976
[8]	Bai Y., Zhao S. H., Tong Y. Y., Zhang X. Y., Liu X., Tian M., J. Appl. Polym. Sci., 2013, 128(4), 2516-2524
[9]	Zhang S., Zhao S. H., Zhang X., Zhang X. Y., Zhang L. Q., Wu Y. P., J. Appl. Polym. Sci., 2014, 131(6), 596-602
[10]	Wang L., Zhao S. H., Li A., Zhang X. Y., Polymer,2010, 51(9), 2084-2090
[11]	Raghu P., Nere C. K., Jagtap R. N., J. Appl. Polym. Sci., 2010, 88(2), 266-277
[12]	Wang Z. S., Wang Y. R., Li Y., Xu H. D., Ren Y., Zhang C. Q., J. Appl. Polym. Sci., 2010, 102(6), 5848-5853
[13]	Odar J., Von H. W., Tire Tread Compounds Based on Vinyl Polybutadiene, US 4721749A,1988-01-26
[14]	Song J. S., Huang B. C., Yu D. S., J. Appl. Polym. Sci., 2001, 82(1), 81-89
[15]	Du A. H., Zhao Y. X., Huang B. C., Yao W., Chem. J. Chinese Universities,2010, 31(2), 358-367
[16]	Sandstrom P. H., Tire with Sidewall Comprised of Low Viscosity Trans-1,4-polybutadiene, cis-1,4-Polyisoprene Rubber and cis-1,4-Polybutadiene Rubber, US 20080216934A, 2008-09-11
[17]	Niu Q. T., Jiang X. B., He A. H., Polymer,2014, 55(9), 2146-2152
[18]	Mandelkern L., Quinn F. A., Roberts D. E., J. Am. Chem. Soc., 1956, 78(5), 926-932
[19]	Yao K. C., Nie H. Y., Liang Y. R., Qiu D., He A. H., Polymer,2015, 80, 259-264
[20]	Yao K. C., Nie H. Y., Ma Y. S., Wang R. G., Wang X. J., He A. H., Chem. J. Chinese Universities,2010, 31(12), 2315-2322
	(姚坤承, 聂华荣, 马韵升, 王日国, 王晓建, 贺爱华. 高等学校化学学报, 2016, 37(12), 2315-2322)
[21]	He A. H., Yao W., Huang B. C., Hu Y. L., Jiao S. K., J. Appl. Polym. Sci., 2004, 92(5), 2941-2948
[22]	Wang H., Zou C., He A.H.,Acta. Polym. Sin., 2015, (12), 1387-1395
	(王浩, 邹陈, 贺爱华. 高分子学报, 2015, (12), 1387-1395)
[23]	Zhang Z. Q., Cui L., Yao W., J. Qingdao Unin. Sci. Technol., 2012, 33(4), 396-404
	(张志强, 崔磊, 姚微. 青岛科技大学学报, 2012, 33(4), 396-404)
[24]	Wang H., Cui H. H., Wang R. G., Xu X. J., He A. H., Chin. Synth. Rubb. Ind., 2017, 40(1), 12-17
	(王浩, 崔虹虹, 王日国, 徐新建, 贺爱华. 合成橡胶工业, 2017, 40(1), 12-17)
[25]	Huneau B., Masquelier I., Marco Y., Saux V. L., Noizet S., Schiel C., Charrierp., Rubber Chem. Technol., 2016, 89(1), 126-141