Natural rubber/nitrile butadiene rubber/hindered phenol composites with high-damping properties

Figures & data

Figure 1. AFM micrographs of NR/NBR/AO-80 composites with various mass ratios NR/NBR/AO-80: (a) 25/75/30, (b) 50/50/20, and (c) 75/25/10.

Figure 2. Temperature dependence of loss tangent (tanδ) for NR/NBR/AO-80 composites with various NR/NBR/AO-80 mass ratios.

Figure 3. FTIR spectrum of NR/NBR/AO-80 (75/25/10) composite.

Figure 4. FTIR polarization spectra of NR/NBR/AO-80 (75/25/10) composite under different uniaxial elongations at (a) 836 cm⁻¹ and (b) 2238 cm⁻¹.

Figure 5. Strain dependence of DF for absorption bands at 836 and 2238 cm⁻¹ of FTIR spectrum of NR/NBR/AO-80 (75/25/10) composite.

Figure 6. Stress–strain curves of NR/NBR/AO-80 composites with different mass ratios of NR/NBR/AO-80.

Figure 7. Schematic diagram of hysteresis loop of rubber composite.

Table 1. Relationship between HED and strain of NR/NBR/AO-80 composites.

Strain (%)	HED of NR/NBR/AO-80 composites (MPa)
	(0/100/40)	(25/75/30)	(50/50/20)	(75/25/10)	(100/0/0)
50	3.34	2.73	3.11	1.67	1.65
100	8.82	6.83	7.74	4.30	4.76
150	16.05	14.42	13.63	9.00	10.02
200	25.41	18.13	15.23	11.42	14.24

Table 2. Damping properties of NR/NBR/AO-80 composites with various mass ratios of NR/NBR/AO-80.

Properties^a	NR/NBR/AO-80 composites
	(0/100/40)	(25/75/30)	(50/50/20)	(75/25/10)	(100/0/0)
Tanδmax	2.5	2.2	1.7	1.2	–
Temperature of tanδmax (°C)	20.6	17.5	13.4	23.7	–
Temperature range in which tanδ > 0.3 (°C)	10.7–41.1	8.8–39.0	4.4–36.7	8.8–34.6	0
Temperature range in which tanδ > 0.1 (°C)	7.0–64.7	4.9–55.9	2.8–47.1	3.3–36.3	0
TA^b from −10 to 50°C (°C)	37.0	33.5	38.6	22.5	1.9

^aThe damping properties of the NBR/AO-80 phase.

^bTA denotes the area under the tanδ versus temperature curve.