Tensile yield behavior of PP/SEBS blends

Gupta, A. K.; Purwar, S. N.

doi:10.1002/app.1984.070291126

Cited by 95 publications

(83 citation statements)

References 1 publication

(1 reference statement)

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“…(3), the Nicolais-Narkis model, the values of K are less than unity with an average of K ¼ 0.26, which indicates a high degree of phase interaction and a lesser extent of defects in the blend structure. Similar results were observed by Gupta and Purwar 31,41 and Maiti and Das. 26 The porosity model, eq.…”

Section: Tensile Strengthsupporting

confidence: 93%

Effect of flexibility of ethylene vinyl acetate and crystallization of polypropylene on the mechanical properties of i‐PP/EVA blends

Kakkar¹,

Maiti²

2011

J of Applied Polymer Sci

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Polymer blend technology has been widely used for the past several years for the modification or enhancement of mechanical properties of polymers to obtain an overall balance of properties over those of the constituents. Despite its interesting mechanical and thermal properties, the impact strength of polypropylene leaves wide scope for improvement. A series of blends of ethylene vinyl acetate (EVA) copolymer with an impact grade of isotactic polypropylene (i-PP) were prepared by single screw extrusion at 0-0.32 volume fraction of the dispersed phase. The mechanical properties such as tensile behavior, elongation-at-break, and impact strength of these blends systems as well as crystallinity were evaluated. Crystallinity data have been used in greater depth to support the mechanical properties. Differential scanning calorimetry studies conducted to study the modification in crystallinity of the crystalline component, i-PP, of the blend revealed that the rubber component of the blend enhanced the crystallinity of i-PP phase by providing sites for nucleation. Tensile modulus and strength decreased while the impact strength and breaking elongation enhanced with blending elastomer concentration. The improved properties of these PP/EVA blends are encouraging for carrying out further work on this system (composites) and suggest potential high impact strength applications for PP.

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Section: Tensile Strengthsupporting

confidence: 93%

Effect of flexibility of ethylene vinyl acetate and crystallization of polypropylene on the mechanical properties of i‐PP/EVA blends

Kakkar¹,

Maiti²

2011

J of Applied Polymer Sci

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“…Addition of 10 wt % SEBS reduces the tendency for extrudate distortion in PP as well as the PP/PS and PP/HDPE blends. 3. HDPE is more effective in reducing tendency for extrudate distortion than PS, as apparent from a comparison of APcfi, values for PP/HDPE and PP/PS blends.…”

Section: Extrudate Distortionmentioning

confidence: 94%

Studies on binary and ternary blends of polypropylene with SEBS, PS, and HDPE. I. Melt rheological behavior

Gupta

Purwar

1985

J. Appl. Polym. Sci.

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synopsisStudies are reported on melt rheological behavior of some binary and ternary blends of polypropylene (PP) with one or two of the following polymers: styrene-bethylene butyleneb-styrene triblock copolymer (SEBS), polystyrene (PS), and highdensity polyethylene (HDPE).Blend composition of the binary blends PP/X or ternary blends PP/X/ Y were 90 chosen that the former represent addition of 10 wt % Xto PP while the latter represent 10 wt % addition of X or Y to the PP/ Y or PP/X blend of constant composition W 1 0 by weight, X/ Y being SEBS, PS, or HDPE. Measurements were made on a capillary rheometer using both temperature elevation and constant temperature methods to study the behaviors prior to flow and in the flow region. Flow behavior, measured at a constant temperature (200°C) and varying shear stress (from 1.0 to 5.0 x 106 dyn/cm2) to evaluate melt viscosity and melt elasticity parameters, is discussed for its dependence on the nature of the blend. Extrudate distortion, studied as a function of shear stress to evaluate the critical shear stress for the onset of extrudate distortion, showed differences in the tendency for extrudate distortion or melt fracture of these different blends. Also discussed is theeffect of melt viscosity and melt elasticity on extrudate distortion behavior at the critical condition, which showed a unique critical value of the ratio (melt elasticity parameter)lW(melt viscosity) for all these blends. Blend morphologies before and after the flow through the capillary are investigated through scanning electron microscopy, and their correlations with rheological parameters of the melt are discussed.

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“…In most cases, a blend of polymers without a compatibilizer cannot allow to improve the final product properties [1] . PP has been a widely studied polymer in blends with elastomeric materials [2][3][4] and the most evaluated variables like crystallinity and processability conditions.…”

Section: Introductionmentioning

confidence: 99%

Thermal & morphological evaluation of linear and radial SEBS- polypropylene blends

et al. 2013

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Blending of two or even more immiscible polymers is a very useful method to obtain new polymeric materials with ordered and tailored properties. Thermoplastic elastomers (TPE's) are interesting materials for various applications, including the automotive industry, due to their excellent balance between processability and physical properties, especially using hydrogenated styrene-butadiene copolymer. In the present work, two structures of styreneethylene/buthylene-styrene (SEBS) triblock copolymer (linear and radial) were blended with polypropylene (PP) using a process aid oil. Three different SEBS-PP ratios were evaluated. Phase behavior was studied by means of differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and Scanning electron microscopy (SEM), which confirmed the formation of a single phase material. PP crystallinity was affected by SEBS structure causing a lamellar thinning of crystals. The SEM analysis shows that radial and linear structures of SEBS have different morphology.

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Tensile yield behavior of PP/SEBS blends

Cited by 95 publications

References 1 publication

Effect of flexibility of ethylene vinyl acetate and crystallization of polypropylene on the mechanical properties of i‐PP/EVA blends

Effect of flexibility of ethylene vinyl acetate and crystallization of polypropylene on the mechanical properties of i‐PP/EVA blends

Studies on binary and ternary blends of polypropylene with SEBS, PS, and HDPE. I. Melt rheological behavior

Thermal & morphological evaluation of linear and radial SEBS- polypropylene blends

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