Dynamically vulcanized polypropylene/styrene–butadiene rubber blends: The effect of a peroxide/bismaleimide curing system and composition

Leite, Paulo R. S.; Soares, Bluma G.; Sirqueira, Alex da Silva

doi:10.1002/app.33123

Cited by 17 publications

(18 citation statements)

References 45 publications

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“…It is often noticed that elastomers undergo crosslinking for the stabilization of morphology and for achieving better mechanical properties in the resulting thermoplastic vulcanizates . In support of this, I′Abee et al .…”

Section: Introductionmentioning

confidence: 93%

“…highlighted significantly lower modulus, yield stress, and strain at break values of dynamically vulcanized PP/EPDM blends with respect to the uncured rubber blends, owing to the more elastic nature of cured rubber particles. However, Leite et al . showed that modulus, yield stress, and strain at break values of vulcanized PP/SBR blends were higher than that of the unvulcanized PP/SBR blends.…”

Section: Introductionmentioning

confidence: 99%

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Influence of thermal and morphological characteristics on mechanical responses of polypropylene/γ‐irradiated elastomer blends

Dutta

Ghosh

2018

J of Applied Polymer Sci

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The approach of this paper is to examine the mechanical responses of polypropylene (PP)/γ‐irradiated ethylene acrylic elastomer blends and subsequently compare them with the PP/unirradiated ethylene acrylic elastomer blends. Thorough correlations were drawn between the mechanical characteristics of blends and their morphological, thermal, thermomechanical, and fractured surface morphological aspects. The idea of carrying out γ‐irradiation was to introduce crosslinking points in the elastomer phase. For better understanding, correlations between the impact test results and the fractured surface morphologies were analyzed. The limited tensile properties of PP/γ‐irradiated elastomer blends were attributed not only to the poor interfacial adhesion, obtained by fitting with several theoretical mechanical models, but also to the substantially higher elastomer particle size in the blends than in the PP/unirradiated elastomer blends. The higher loss modulus and tan δ values for PP/unirradiated elastomer blends along with the attainment of much smaller particles of elastomers were responsible for the phenomenal increase in impact properties, which was actually attributed to the formation of crazes inside the dispersed phase during applied impact stress. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46597.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Influence of thermal and morphological characteristics on mechanical responses of polypropylene/γ‐irradiated elastomer blends

Dutta

Ghosh

2018

J of Applied Polymer Sci

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Compatibilizers have been used widely to improve the compatibility and properties of the polymer blends. Properties of the polymer blends are influenced by the properties of each component and dispersion of the dispersed phase.…”

Section: Introductionmentioning

confidence: 99%

Effects of accelerated aging and compatibilizers on the mechanical and morphological properties of polypropylene and poly(acrylonitrile‐butadiene‐styrene) blends

Lee

Park

et al. 2012

J of Applied Polymer Sci

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The effects of maleic anhydride-grafted styrene-ethylene-butylene-styrene copolymer (SEBS-g-MAH) on the mechanical and morphological properties of polypropylene (PP) and poly(acrylonitrile-butadiene-styrene) (ABS) blends were investigated. Based on mechanical properties, including impact and tensile strengths, the PP/ABS (70/30) blends containing SEBS-g-MAH showed improved impact strength with minimal loss of tensile strength. As determined from morphological studies of the PP/ABS blends, addition of SEBS-g-MAH decreased PP/ABS blend droplet size more than the addition of SEBS. Additionally, the effects of SEBS-g-MAH and SEBS on the mechanical and morphological properties of the PP/ABS (70/30) blends were investigated during accelerated aging in an oven at 90 C for 72 h (one cycle). The impact strength of the PP/ABS (70/30) blends with SEBS-g-MAH (7 phr) decreased less than 10% after five cycles, but blends with SEBS (7 phr) and blends without compatibilizer decreased as much as 37%. The tensile strengths of the PP/ABS (70/30) blends after accelerated aging indicated a trend similar to that of the impact strength. The morphological studies indicated no significant changes in the PP/ABS (70/30) blends with SEBS-g-MAH; however, many cavities and damages were observed in the blend with SEBS. The above results suggest that SEBS-g-MAH acts as an impact modifier and as a good compatibilizer in the PP/ABS (70/30) blends.

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“…PP resins are being produced for a very wide range of end-use applications. [1][2][3][4][5][6][7] For that purpose, the mechanical properties of these resins have to be tailor-made to fit the performance requirements of each application. In addition to polymerization methods, PP resins having controlled molecular characteristics and therefore controlled rheological properties can be produced through well-known visbreaking operations.…”

Section: Introductionmentioning

confidence: 99%

“…39, No. 2,2015 and gloss. 14,15 Chain-scission occurs when a C-C bond near the macroradical tends to break down to two smaller fragments.…”

Section: Introductionmentioning

confidence: 99%

Influence of Dilauroyl Peroxide on Mechanical and Thermal Properties of Different Polypropylene Matrices

Şirin¹,

Yavuz²,

Çanlı³

2015

Polymer Korea

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In this study, the influence of dilauroyl peroxide on mechanical and thermal properties of different polypropylene (PP) matrices was investigated. Polypropylene matrices, different molecular weight isotactic PP containing 0.01, 0.02, 0.04, 0.06, 0.08, and 0.1 wt% of dilauroyl peroxide (DLP) were prepared by using a single-screw extruder. The effect of the visbreaking agent (DLP) on mechanical, physical, thermal and morphological properties of different molecular weight PP had been studied. Mechanical properties (tensile strength at break point, at yield and elongation at break point), melt flow index (MFI), scanning electron microscope (SEM) and differential scanning calorimetric (DSC) analyses of these matrices were examined. Melting (T m ) and crystallization (T c ) temperatures, crystallinity ratio (%) and enthalpies were determined. The microstructure of isotactic polypropylene matrix was investigated by scanning electron microscopy (SEM). From SEM analysis, it was observed that the surface disorder increased by the increasing amount of DLP. As a result of DSC analyses, the crystallinity ratio of the PP matrices has varied between 1.64-7.27%. Mechanical properties of the matrices have been improved. Particularly, the mechanical tests of PP have given interesting results when compounded with 0.06-0.08 wt% dilauroyl peroxide (DLP). Mechanical properties and thermal decomposition processes were all changed by increasing the amount of DLP in the matrix structure.

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Dynamically vulcanized polypropylene/styrene–butadiene rubber blends: The effect of a peroxide/bismaleimide curing system and composition

Cited by 17 publications

References 45 publications

Influence of thermal and morphological characteristics on mechanical responses of polypropylene/γ‐irradiated elastomer blends

Influence of thermal and morphological characteristics on mechanical responses of polypropylene/γ‐irradiated elastomer blends

Effects of accelerated aging and compatibilizers on the mechanical and morphological properties of polypropylene and poly(acrylonitrile‐butadiene‐styrene) blends

Influence of Dilauroyl Peroxide on Mechanical and Thermal Properties of Different Polypropylene Matrices

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