Temperature dependence of the degree of compatibility in SBR–NBR blends by ultrasonic attenuation measurements: influence of unsaturated polyester additive

Polymer blends lead to producing a new class of plastics, which may have better properties than being individual. In this study, the ternary blends of natural rubber (NR)/styrene-butadiene rubber (SBR)/nitrile rubber (NBR) were prepared via melt compounding, and then the physicomechanical properties of ternary NR/SBR/NBR blends were investigated. NR content was kept constant at 30 phr, while SBR and NBR fractions were varied simultaneously. The effect of the addition of 3 phr of ultrablend 4000 as compatibilizer on the compatibility of the rubber blends was studied. The results revealed that the use of the compatibilizer has significantly resulted in the clear stability of the scorch time and the optimum cure time of the blends. Tensile strength; stress at 100%, 200%, and 300% elongations; elongation at break %; compression strength; and compression set increase with the NBR content. There was a dramatic rise in the value of swelling ratio with the decrease of NBR. Moreover, the dynamic mechanical analysis showed some shifts in glass transition temperatures for blends to higher and lower temperatures as a function of the composition, which indicates the partial miscibility between the contributing components. Scanning electron microscopy of the tear fracture surfaces indicated that incorporation of NBR in the blends resulted in better adhesion of ternary blends and improved the tensile properties of ternary blends.

show abstract

“…However, a certain degree of mixing could produce a semi-compatible blend. 41,42 Figure 8 illustrates three evident features 42 :…”

Section: Resultsmentioning

confidence: 99%

A comparative study on mechanical and rheological properties of ternary rubber blends

Abdelsalam

Araby

El‐Sabbagh

et al. 2020

Polymers and Polymer Composites

View full text Add to dashboard Cite

show abstract

“…These methods include viscometric measurements, 9 dynamic mechanical analysis, electron microscopy, differential scanning calorimetry (DSC), [10][11][12] infrared (IR) spectroscopy, dielectric permittivity, 13,14 and ultrasonic measurements. 15,16 The aim of this investigation was to prepare a suitable polyester that could act as a compatibilizing agent for series of PMMA/PC, PMMA/PS, and PC/ PS blends. The degree of compatibility was studied through dielectric and viscosity techniques.…”

Section: Introductionmentioning

confidence: 99%

“…A variety of experimental methods have been used to study the blend compatibility. These methods include viscometric measurements,9 dynamic mechanical analysis, electron microscopy, differential scanning calorimetry (DSC),10–12 infrared (IR) spectroscopy, dielectric permittivity,13, 14 and ultrasonic measurements 15, 16…”

Section: Introductionmentioning

confidence: 99%

Polyester resin as a compatibilizing agent for some polymeric blends

Ward¹,

Mansour²,

Abd‐El‐Messieh³

2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

Dielectric and viscosity techniques were used to determine the degree of the compatibility of poly(methyl methacrylate)/polycarbonate, poly(methyl methacrylate)/ polystyrene, and polycarbonate/polystyrene blends in different ratios (25/75, 50/50, and 75/25 w/w). The effect of the addition of 5, 10, and 20% concentrations of the prepared polyester resin [poly(butylene terephthalate adipate)] on the compatibility of these blends was studied. The dielectric properties were measured over a frequency range (from 100 Hz to 100 kHz) at various temperatures covering the glass-transition temperatures of the polymers used (from 30 to 1708C). It was found from the dielectric and viscosity measurements that the addition of 10% polyester to poly(methyl methacrylate)/polycarbonate, 20% polyester to poly(methyl methacrylate)/polystyrene, and 5% polyester to polycarbonate/polystyrene blends enhanced the degree of compatibility of such blends.

show abstract

“…The ultrasonic technique was successfully used as a tool to investigate many polymeric properties 11–13…”

Section: Introductionmentioning

confidence: 99%

“…The ultrasonic technique was successfully used as a tool to investigate many polymeric properties. [11][12][13] However, in our previous work, 14 the crosslink density of various nitrile mixes was calculated using the kinetic theory of elasticity. In this study, we are trying to calculate the crosslink density of SBR vulcanizates, containing different vulcanizing system, by stressstrain measurements and ultrasonic technique.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic and mechanical measurements for the detection of crosslink density of SBR and NBR based on various curing systems

Lawandy

Halim

Afifi

2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

The stress-strain measurements of styrenebutadiene rubber (SBR) samples based on various curing systems were used to access the crosslink density of various rubber mixes. Same materials were subjected to various uniaxial compression strains. The thicknesses before compression and after recovery were recorded. After recovery, pulse echo method was used to measure the ultrasonic velocity for the dilatational wave and that of shear wave at a frequency of 2 MHz and at room temperature. Both of the ultrasonic velocities were used to determine the elastic moduli of the samples. The relation between the elastic moduli and the corresponding recovery values were used to determine the crosslink density of samples. The crosslink density values obtained from the two techniques were compared. Butadiene-acrylonitrile (NBR) rubber mix was used to show that the ultrasonic technique is applicable for other rubber compounds.

show abstract

Temperature dependence of the degree of compatibility in SBR–NBR blends by ultrasonic attenuation measurements: influence of unsaturated polyester additive

Cited by 15 publications

References 15 publications

A comparative study on mechanical and rheological properties of ternary rubber blends

A comparative study on mechanical and rheological properties of ternary rubber blends

Polyester resin as a compatibilizing agent for some polymeric blends

Ultrasonic and mechanical measurements for the detection of crosslink density of SBR and NBR based on various curing systems

Contact Info

Product

Resources

About