Effect of precured degrees on morphology, thermal, and mechanical properties of BR/SBR/NR foams

Wang, Xu; Feng, Na; Chang, Shiyan

doi:10.1002/pc.22489

Cited by 29 publications

(23 citation statements)

References 40 publications

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“…It means the cross-linking density of SBR foams could be increased. Moreover, the physical properties, shrinkage, compression set and other mechanical properties may be enhanced30.…”

Section: Resultsmentioning

confidence: 99%

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Shao

et al. 2016

Sci Rep

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Sulfur (S) cross-linking styrene butadiene rubber (SBR) foams show high shrinkage due to the cure reversion, leading to reduced yield and increased processing cost. In this paper, double cross-linking system by S and dicumyl peroxide (DCP) was used to decrease the shrinkage of SBR foams. Most importantly, the synergy of double cross-linking agents was reported for the first time to our knowledge. The cell size and its distribution of SBR foams were investigated by FESEM images, which show the effect of DCP content on the cell structure of the SBR foams. The relationships between shrinkage and crystalline of SBR foams were analyzed by the synergy of double cross-linking agents, which were demonstrated by FTIR, Raman spectra, XRD, DSC and TGA. When the DCP content was 0.6 phr, the SBR foams exhibit excellent physical and mechanical properties such as low density (0.223 g/cm3), reduced shrinkage (2.25%) and compression set (10.96%), as well as elevated elongation at break (1.78 × 103%) and tear strength (54.63 N/mm). The results show that these properties are related to the double cross-linking system of SBR foams. Moreover, the double cross-linking SBR foams present high electromagnetic interference (EMI) shielding properties compared with the S cross-linking SBR foams.

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“…It means the cross-linking density of SBR foams could be increased. Moreover, the physical properties, shrinkage, compression set and other mechanical properties may be enhanced30.…”

Section: Resultsmentioning

confidence: 99%

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Shao

et al. 2016

Sci Rep

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“…Compared to SBR/50lignin, the crosslink density of SBR/50lignin/F51 shows an increasing trend with the increase of F51, owing to the crosslink reaction between F51 and lignin. As the integrity of crosslink network was improved, A(M c ) increased and A(T 2 ) decreased [38]. This result shows that the formation of lignin-F51 networks can bring on more crosslinking points, fewer activity units, and lower activity ability.…”

Section: Crosslink Density Analysismentioning

confidence: 65%

“…A(T 2 ) represents the percentage of high-mobile fractions while A(M c ) represents percentage of crosslinking fractions [40]. A less Crosslink Density value usually corresponds to a bigger M c value [38,41] and a less A(T 2 ) value usually corresponds to a bigger A(M c ) value [38].…”

Section: Crosslink Density Analysismentioning

confidence: 99%

“…Recently, many researchers use Magnetic Resonance Crosslink Density Measurements to the determinate the crosslink densities in rubber materials [36][37][38][39], and not only this method simple to use and time-saving but also this method can provide several more parameters characterizing the molecular dynamics of the network. Such as the average molecular weight of chains between two adjacent crosslinks (M c ), the motion of dangling chain ends and free chain (A(T 2 )), and the percentage of inter crosslink chain A(M c ), etc.…”

Section: Crosslink Density Analysismentioning

confidence: 99%

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Reinforcing styrene butadiene rubber with lignin-novolac epoxy resin networks

Yu¹,

He²,

Jiang³

et al. 2015

Express Polym. Lett.

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Abstract. In this study, lignin-novolac epoxy resin networks were fabricated in the styrene butadiene rubber (SBR) matrix by combination of latex compounding and melt mixing. Firstly, SBR/lignin compounds were co-coagulated by SBR latex and lignin aqueous solution. Then the novolac epoxy resin (F51) was added in the SBR/lignin compounds by melt compounding method. F51 was directly cured by lignin via the ring-opening reaction of epoxy groups of F51 and OH groups (or COOH groups) of lignin during the curing process of rubber compounds, as was particularly evident from Fourier transform infrared spectroscopy (FTIR) studies and maximum torque of the curing analysis. The existence of lignin-F51 networks were also detected by scanning electron microscope (SEM) and dynamic mechanical analysis (DMA). The structure of the SBR/lignin/F51 was also characterized by rubber process analyzer (RPA), thermogravimetric analysis (TGA) and determination of crosslinking density. Due to rigid lignin-F51 networks achieved in SBR/lignin/F51 composites, it was found that the hardness, modulus, tear strength, crosslinking density, the temperature of 5 and 10% weight-loss were significantly enhanced with the loading of F51.

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“…For all samples, the co‐vulcanization process is obtained and overlap of the peaks can be observed (Fig. b) .…”

Section: Resultsmentioning

confidence: 97%

The properties of elastomeric composites based on three network precursors

Jovanović¹,

Jovanović²,

Marković³

et al. 2018

Polymer Composites

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The powder recycled rubber (PRR) can be used as a filler and a modifier for elastomeric materials and asphalt. Composites based on elastomers and recycled rubber powders are a serious challenge for the environment. The main goal of this paper was to study the effect of rubber powder on the mechanical properties of elastomeric composites based on three precursors of the network. Triple blends were prepared using non‐polar natural rubber (NR), polyisoprene rubber (BR), and styrene‐butadiene rubber (SBR) (mass ratio 40/40/20). In all rubber compounds, the carbon black (CB)/PRR mass ratio is constant (60). Samples were prepared using two roll mill. The characteristics of hardening (optimum cure time, scorch time, minimum and maximum torque) of rubber mixtures were tested. Tensile strength, modulus at 100% elongation and elongation at break are decreasing with PRR ratio is increasing. It is due to poor adhesion of PRR into NR/BR/SBR/CB matrix. The thermal degradation temperature shifts to a higher temperature up to 5 phr of PRR in NR/BR/SBR/CB rubber blends. Fourier‐transform infrared spectra of NR/BR/SBR/CB/PRR samples show that the absorption bands shifted 7–15 cm−1 to higher wavenumbers and confirmed rubber–filler interaction. Morphology was assessed by scanning electron microscopy. POLYM. COMPOS., 40:1307–1314, 2019. © 2018 Society of Plastics Engineers

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Effect of precured degrees on morphology, thermal, and mechanical properties of BR/SBR/NR foams

Cited by 29 publications

References 40 publications

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Reinforcing styrene butadiene rubber with lignin-novolac epoxy resin networks

The properties of elastomeric composites based on three network precursors

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