Effect of composition and comonomer type on the rheology, morphology and properties of ethylene-α-olefin copolymer/polypropylene blends

Kontopoulou, Marianna; Wang, W.; Gopakumar, T. G.; Cheung, C.

doi:10.1016/j.polymer.2003.08.043

Cited by 107 publications

(76 citation statements)

References 35 publications

(23 reference statements)

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“…The modification of iPP ranges from the addition of rubbers, [1][2][3][4][5] thermoplastic elstomers, [6][7][8][9][10][11][12][13] rigid inorganic and organic fillers, 4,14 b-nucleating agent 15,16 to introduction of comonomers 17,18 and polymerization of in-reactor iPP catalloy, 19,20 etc. The well-known rubbery iPP modifiers included EPR, EPDM, SEBS, and so on.…”

Section: Introductionmentioning

confidence: 99%

“…These characteristics allowed the application of PEOc as a new iPP impact modifier, which had been proven to be an excellent substitute following the classical iPP modifiers. [6][7][8][9][10][11][12][13] The famous toughening theories of rubberpolymer blends include crack termination at rubber particles, cavitation around rubber particles, matrix crazing, shear yielding, combined crazing and yielding, Wu's interparticle distance model and so on. [23][24][25][26][27] On the basis of kinds of traditional rubber toughened polymer systems, these toughening theories were established and developed from qualitatively to quantitatively.…”

Section: Introductionmentioning

confidence: 99%

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Phase separation induced morphology evolution andcorresponding impact fracture behavior of iPP/PEOc blends

Pang

Dong

Zhao

et al. 2011

J of Applied Polymer Sci

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In this study, the influence of phase separation on impact toughness of isotactic polypropylene (iPP)/ poly(ethylene-co-octene) (PEOc) blends was investigated. For the typical toughened polymeric system, three iPP/ PEOc compositions (80/20, 70/30, and 60/40) were selected. When the polymeric blends were annealed at 200 C, the coarsening of phase domains was more prominent for the blend containing higher content of PEOc, and the scale of its morphological evolution was increased as well. The impact test showed that the impact strength variation trend as a function of annealing time was closely related to morphological evolution. It was believed that the sharpening of phase boundary and coarsening of phase domains were responsible for the depression of impact toughness, and the probable fracture mode alteration from shear banding to crazing and voiding. Structure evolution induced by phase separation showed an important effect on impact toughness, and it was also affected by the environmental conditions. Proper temperature was required to catch the tough-brittle transition induced by phase separation. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: [445][446][447][448][449][450][451][452][453] 2011

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase separation induced morphology evolution andcorresponding impact fracture behavior of iPP/PEOc blends

Pang

Dong

Zhao

et al. 2011

J of Applied Polymer Sci

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“…The DSC thermograms of the processed MPP showed a melting endotherm spanning between 143 and 161°C. The DSC data of the blends revealed that the melting temperature of polypropylene was not apparently affected by the addition of the flame retardant additives (see Table 6), indicating the absence of interactions such as cocrystallization within the polypropylene phase [28], as well as poor compatibility of the flame retardants with polypropylene. Since the glass transition signal from DSC traces was rather weak and broad, the T g s of the blends were determined through DMTA (see Section 3.4).…”

Section: Crystallinity Of the Melt Mixed Blendsmentioning

confidence: 99%

Effect of phosphorous-containing modified poly(vinyl alcohol) on the mechanical and flame retardant properties of polypropylene

Sauca¹,

Giamberini²,

Cerruti³

et al. 2015

Express Polym. Lett.

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“…[10] Blends of LLDPE and low-density polyethylene (LDPE) are often used for film manufacture because of their good processability and excellent mechanical properties. LLDPE, by itself, provides superior mechanical and thermal properties to the film, whereas the LCB present in LDPE improves the processability by increasing the melt strength.…”

Section: Introductionmentioning

confidence: 99%

Structural and Mechanical Properties Changes of Ethylene‐α‐olefin Copolymer Blends Induced by Thermal Treatments and Composition

Chen

Shanks

Amarasinghe

2004

Macro Materials & Eng

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Summary: Blends of single‐site catalysed ethylene‐α‐butene (C4VLDPE) and ethylene‐α‐octene (C8VLDPE) copolymers were prepared by melt extrusion. The phase morphology, thermal and mechanical properties of the blends have been investigated by differential scanning calorimetry (DSC), scanning electron microscopy (SEM), tensile test and dynamic mechanical analysis (DMA). Depending on the composition and thermal history, significant differences in structure and behaviour were found. It was also found that some degree of co‐crystallization occurred for quenched blends; whereas most of the oven slowly cooled blends showed two well‐defined melting peaks, indicating that the slow cooling favoured partial segregation of the fractions with different degrees of branching to form two morphologies. Moreover, SEM revealed morphology of the thinner crystals distributed in‐between the thicker sheaf‐like crystals for the slowly cooled blends with 20–50% C8VLDPE. Therefore, the synergism in mechanical properties for the blends with 20–50% C8VLDPE is due to a combination of larger crystal size, more complete phase separation and interfacial interaction produced by the segregation effect of the slow cooling treatment. DMA studies showed that the storage modulus increased as the addition of C8VLDPE and modulus for the slowly cooled blends are about twice those measured for the quenched ones, indicating higher stiffness of the blends. The smooth shift of β relaxation temperature with addition of C8VLDPE for both sets of blends confirmed the miscibility in the amorphous phase.SEM image of the C4VLDPE‐C8VLDPE (50/50) blend after oven slow cooling treatment.magnified imageSEM image of the C4VLDPE‐C8VLDPE (50/50) blend after oven slow cooling treatment.

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Effect of composition and comonomer type on the rheology, morphology and properties of ethylene-α-olefin copolymer/polypropylene blends

Cited by 107 publications

References 35 publications

Phase separation induced morphology evolution andcorresponding impact fracture behavior of iPP/PEOc blends

Phase separation induced morphology evolution andcorresponding impact fracture behavior of iPP/PEOc blends

Effect of phosphorous-containing modified poly(vinyl alcohol) on the mechanical and flame retardant properties of polypropylene

Structural and Mechanical Properties Changes of Ethylene‐α‐olefin Copolymer Blends Induced by Thermal Treatments and Composition

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