The Technological Compatibilization of Natural Rubber/Polystyrene Blends by the Addition of Natural Rubber-graft-Polystyrene

Asaletha, R.; Thomas, Sabu; Kumaran, M. G.

doi:10.5254/1.3538766

Cited by 50 publications

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“…The same conclusion was drawn by Asaletha et al 25 for the NR/PS blend system using NR-g-PS as the compatibilizer. Two-step mixing was carried out by blending the dispersed phase with the compatibilizer first and then blending it with the matrix polymer.…”

Section: Effect Of Mode Of Addition On Phase Separationsupporting

confidence: 70%

Compatibility studies on solution of polymer blends by viscometric and phase-separation technique

Chattopadhyay

2000

J. Appl. Polym. Sci.

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Solution blending of polystyrene (PS) and natural rubber (NR) was carried out in toluene and chloroform to determine the compatibility. Experimental evidence for the compatibility of these blends was derived from viscometric and phase-separation studies. The viscometric method was based on the intrinsic viscosities of transfer of polymer in pure and "mixed" solvents. The compatibility of these blends based on the heat of mixing was also examined theoretically. All the experimental and theoretical evidence show that the blends are incompatible at the compositions studied.

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Section: Effect Of Mode Of Addition On Phase Separationsupporting

confidence: 70%

Compatibility studies on solution of polymer blends by viscometric and phase-separation technique

Chattopadhyay

2000

J. Appl. Polym. Sci.

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“…The grafting efficiency and percentage of PS grafted were 49 and 20%, respectively. 1,19 The FTIR spectrum of the graft copolymer ( Fig. 1 …”

Section: Preparation Of the Compatibilizermentioning

confidence: 99%

“…1,18 The irradiated product was coagulated with 2% formic acid, washed with water, and dried in the oven. Homopolymers NR and PS were removed from the crude sample by soxhlet extraction with petroleum ether and methyl ethyl ketone, respectively.…”

Section: Preparation Of the Compatibilizermentioning

confidence: 99%

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Melt rheology and morphology of physically compatibilized natural rubber-polystyrene blends by the addition of natural rubber-g-polystyrene

Asaletha

Groeninckx

Kumaran

et al. 1998

J. Appl. Polym. Sci.

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Blends of natural rubber (NR) and polystyrene (PS) were prepared by melt mixing in a Brabender plasticorder and by solution casting using chloroform as the casting solvent. Earlier studies have indicated that these blends are incompatible and immiscible, and their compatibility can be improved by the addition of a graft copolymer of NR and PS (NR-g-PS). The rheological behavior of these blends has been carried out in the presence and absence of the compatibilizer using a capillary rheometer and a melt flow indexer. The effects of blend ratio, processing techniques (melt mixing versus solution casting), shear stress, and temperature on the rheological behavior have been studied in detail. Both in the presence and absence of the copolymer, the blends showed a decrease in viscosity with an increase of shear stress, indicating pseudoplastic nature. Solution-cast blends showed a higher viscosity as compared to melt-mixed blends. The viscosity versus composition curve of both melt-mixed and solution-cast blends showed negative deviation from the additivity at a higher shear rate region. This is associated with the interlayer slip between the highly incompatible NR and PS phases. The effects of graft copolymer loading and temperature on solution-cast blends were studied, and it was found that as the copolymer loading increases, the shear viscosity increases. This is due to the high interfacial interaction between the two components in the presence of the copolymer. The copolymer, in fact, locates at the interface and makes the interface more broad. However, at higher loading of the copolymer, the viscosity of the blends decreases. This may be associated with the formation of micelles, which have a plasticizing action on the viscosity of the blends. Melt elasticity parameters like principal normal stress difference, recoverable elastic shear strain, and die swell were evaluated. Master curves have been generated using modified viscosity and shear rate functions that contain the melt flow index as a parameter. The extrudate morphology of the blends was studied using a scanning electron microscope. Addition of the copolymer reduces the domain size of the dispersed phase, followed by a leveling off at a higher concentration. The leveling off is an indication of interfacial saturation. The interparticle distance also decreased followed by a leveling off at a higher loading of the copolymer.

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“…These include the addition of a compatibilizing agent such as a third polymer graft or block copolymer, which improves the interaction between the constituent polymer [1,2,[7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Compatibility of NR-EPDM Blends Using Electrical and Mechanical Techniques

Abou-Helal

El‐Sabbagh

2005

Journal of Elastomers & Plastics

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Systematic electrical and physicomechanical studies have been carried out on natural rubber (NR) blended with synthetic rubber ethylenepropylene diene monomer (EPDM) as non-polar rubber. The permittivity (" 0 ) and dielectric loss (" 00 ) of this blend have been measured over a wide range of frequencies (42 Hz-5 MHz) at room temperature (%25 C). Compatibility of NR-EPDM can be enhanced by the addition of compatibilizers, such as polybutadiene (BR), chlorinated rubber, chloro-sulfonated polyethylene (SPE), polyvinyl chloride (PVC), and graft copolymerization of EPDM with metallic anhydride [EPDM-g-MAH]. The compatibility results obtained from the dielectric measurements are comparable with those obtained from the calculation of the strain energy, fatigue, mechanical failure tests, differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The results

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The Technological Compatibilization of Natural Rubber/Polystyrene Blends by the Addition of Natural Rubber-graft-Polystyrene

Cited by 50 publications

References 0 publications

Compatibility studies on solution of polymer blends by viscometric and phase-separation technique

Compatibility studies on solution of polymer blends by viscometric and phase-separation technique

Melt rheology and morphology of physically compatibilized natural rubber-polystyrene blends by the addition of natural rubber-g-polystyrene

A Study on the Compatibility of NR-EPDM Blends Using Electrical and Mechanical Techniques

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