Studies on the dynamically vulcanized polypropylene (PP)/butadiene styrene block copolymer (SBS) blends: Mechanical properties

Saroop, Madhumita; Mathur, G. N.

doi:10.1002/(sici)1097-4628(19970926)65:13<2691::aid-app10>3.0.co;2-0

Cited by 28 publications

(21 citation statements)

References 4 publications

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“…The cracks occur as a result of the exerted strain, the HDPE particles that are in a dispersed phase bridge each crack to prevent the cracks from distending. Meanwhile, these HDPE particles also absorb a great deal of energy caused by an external force, and thereby augmenting the impact strength of the polyblends [24,26]. These results are consistent with that shown in Figure 1c.…”

Section: Resultssupporting

confidence: 85%

Preparation and Compatibility Evaluation of Polypropylene/High Density Polyethylene Polyblends

et al. 2015

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This study proposes melt-blending polypropylene (PP) and high density polyethylene (HDPE) that have a similar melt flow index (MFI) to form PP/HDPE polyblends. The influence of the content of HDPE on the properties and compatibility of polyblends is examined by using a tensile test, flexural test, Izod impact test, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), polarized light microscopy (PLM), and X-ray diffraction (XRD). The SEM results show that PP and HDPE are incompatible polymers with PP being a continuous phase and HDPE being a dispersed phase. The FTIR results show that the combination of HDPE does not influence the chemical structure of PP, indicating that the polyblends are made of a physical blending. The DSC and XRD results show that PP and HDPE are not compatible, and the combination of HDPE is not correlated with the crystalline structure and stability of PP. The PLM results show that the combination of HDPE causes stacking and incompatibility between HDPE and PP spherulites, and PP thus has incomplete spherulite morphology and a smaller spherulite size. However, according to mechanical property test results, the combination of HDPE improves the impact strength of PP.

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Section: Resultssupporting

confidence: 85%

Preparation and Compatibility Evaluation of Polypropylene/High Density Polyethylene Polyblends

et al. 2015

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“…The long period ( L B ) that defines the statistical average of the distance between two lamellae is determined by the position of the first intensity maximum ( s m ) in 1D‐SAXS profiles by L B = 1/ s m . The thickness of crystalline lamella ( L c ) can be estimated by L c = X c(WAXD) × L B , and the thickness of the confined amorphous phase L a = L B − L c .…”

Section: Methodsmentioning

confidence: 99%

Greatly improved toughness of isotactic polypropylene blends with traces of carbon nanotubes

Chen

Fan

Song

et al. 2018

Polymer Engineering & Sci

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In this work, the β‐nucleated isotactic polypropylene (iPP)/ ethylene‐octene copolymer (POE) blends demonstrated greatly enhanced impact toughness by adding traces of carbon nanotubes (CNTs) (only 0.05 wt%). When the POE content was 30 wt%, the impact strength of β‐nucleated iPP/POE blends with CNTs was as high as 51.7 kJ/m2, about 5.6 kJ/m2 higher than β‐nucleated iPP/POE blends, 15.2 kJ/m2 higher than CNTs‐filled iPP/POE blends, and almost 19 times of pure iPP sample. This significantly improved impact toughness was considered to be attributed to the shear yielding and multiple‐crazing, originating from the presence of abundant β‐crystals in the iPP matrix, the enhanced mobility of the molecular chains in the confined amorphous region of iPP lamellae and the homogenous distribution of POE dispersed phase with a small size, indicating the synergistic effect of CNTs, β‐nucleating agent and POE on the toughness of iPP. POLYM. ENG. SCI., 59:757–764, 2019. © 2018 Society of Plastics Engineers

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“…Hern andez et al 11 had prepared dynamically vulcanized PP/SBS blends, and Deeply Double Edged Notched Tension specimens were cut from injection molded plaques for fracture testing. Madhumita Saroop et al 12 had prepared unvulcanized and dynamically vulcanized blends of isotactic PP and SBS by a modified phenolic resole resin in an internal mixer. They found that the dynamic vulcanization method can impair fracture resistance to PP/SBS blends.…”

Section: Introductionmentioning

confidence: 99%

Influences of dicumyl peroxide on morphology and mechanical properties of polypropylene/poly(styrene‐b‐butadiene‐b‐styrene) blends via vane‐extruder

Yang

Huang

et al. 2014

J of Applied Polymer Sci

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Polypropylene (PP) and poly(styrene-b-butadiene-b-styrene) block copolymer (SBS) were melt-blended in the presence of initiator system. Dicumyl peroxide (DCP)/Triallyl isocyanurate (TAIC) via self-deigned VE, aiming at in situ reactive compatibilization of toughed PP/SBS blend. The reactivity, morphology and mechanical properties of PP/SBS/DCP/TAIC blends were studied. Online torque detection was conducted to monitor changes in viscosities of reactive compatibilized blends, which could give proof of the interfacial grafted reaction induced by DCP/TAIC system. The effect of reactive compatibilization on the dispersed particles sizes and interfacial adhesion was studied by scanning electron microscopy. Analysis on mechanical performance revealed the impact strength improved after treated by initiator system, moreover, the impact-fractured surface observation showed, the failure mode changed from debonding mechanism of neat 50PP/50SBS blend to plastic deformation mechanism of blend containing 3.0 phr initiator system. With improved interfacial adhesion, compatibilized blends not only were toughened but also exhibited enhanced tensile strength and thermal stability. Dynamic mechanical analysis showed a reduction of DT g between PP phase and the PB segments in SBS phase, indicating reactive compatibilization of the blend was achieved. In the final part, a brief discussion was given about the dominant effects from chain scission of PP matrix to intergrafting reactions of PP and SBS, under different content of DCP/TAIC initiator system.

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Studies on the dynamically vulcanized polypropylene (PP)/butadiene styrene block copolymer (SBS) blends: Mechanical properties

Cited by 28 publications

References 4 publications

Preparation and Compatibility Evaluation of Polypropylene/High Density Polyethylene Polyblends

Preparation and Compatibility Evaluation of Polypropylene/High Density Polyethylene Polyblends

Greatly improved toughness of isotactic polypropylene blends with traces of carbon nanotubes

Influences of dicumyl peroxide on morphology and mechanical properties of polypropylene/poly(styrene‐b‐butadiene‐b‐styrene) blends via vane‐extruder

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