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Tam, Wing Yip; Cheung, T.; Li, Robert K.Y.

doi:10.1023/a:1004701501431

Cited by 33 publications

(11 citation statements)

References 17 publications

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“…Moreover, large plastic deformation in the matrix and fiber interface and fiber pullout were the primary energy-dissipative processes during yielding and impact fracture. 8 Tam et al 9 also reported similar findings, that fiber debonding and pullout were responsible for the impact failure of SGF/ EPR/PP hybrids. However, they indicated that the elastomer exerted a limited toughening effect on the hybrids.…”

Section: Introductionmentioning

confidence: 61%

“…The impact modifier had a strong toughening effect for the PP homopolymer only. 9 The adhesion between the fiber and matrix or elastomeric phase plays a key role in determining the mechanical properties of SGF-reinforced blends and hybrids. Nair et al 7 indicated that the toughening effect caused by the glass fibers was critically related to the fiber-matrix interfacial strength.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and performance characteristics of short‐glass‐fiber/maleated styrene–ethylene–butylene–styrene/polypropylene hybrid composites

Tjong

et al. 2002

J of Applied Polymer Sci

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Eighty/twenty polypropylene (PP)/styreneethylene-butylene-styrene (SEBS) and 80/20 PP/maleated styrene-ethylene-butylene-styrene (SEBS-g-MA) blends reinforced with 30 wt % short glass fibers (SGFs) were prepared by extrusion and subsequent injection molding. The influence of the maleic anhydride (MA) functional group grafted to SEBS on the properties of SGF/SEBS/PP hybrid composites was studied. Tensile and impact tests showed that the SEBS-g-MA copolymer improved the yield strength and impact toughness of the hybrid composites. Extensive plastic deformation occurred at the matrix interface layer next to the fibers of the SGF/SEBS-g-MA/PP composites during impact testing. This was attributed to the MA functional group, which enhanced the adhesion between SEBS and SGF. Differential scanning calorimetry measurements indicated that SEBS promoted the crystallization of PP spherulites by acting as active nucleation sites. However, the MA functional group grafted to SEBS retarded the crystallization of PP. Finally, polarized optical microscopy observations confirmed the absence of transcrystallinity at the glass-fiber surfaces of both SGF/SEBS/PP and SGF/SEBS-g-MA/PP hybrid composites.

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Section: Introductionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Preparation and performance characteristics of short‐glass‐fiber/maleated styrene–ethylene–butylene–styrene/polypropylene hybrid composites

Tjong

et al. 2002

J of Applied Polymer Sci

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“…In the wake of elastomer particle cavitation, the deformed elastomer particles behaved as equatorial stress concentrators and initiated local shear yielding at the polymer matrix surrounding the elastomer particles, thereby avoiding brittle catastrophic failure of the polymer system. Tam et al [63] found a major failure mechanism for polymer systems based on readily deformable polymers like iPP that was described as shear yielding of iPP matrix around dispersed particles. According to Wu [64, 65], pseudo‐ductile polymers tend to shear yield, whereas brittle ones tend to craze, and brittle‐ductile transition occurs at a critical interparticle distance between elastomer particles.…”

Section: Resultsmentioning

confidence: 99%

“…According to Wu et al [54], toughness of polymers reinforced with short fibers was influenced significantly by degree of interfacial adhesion, and neither very strong nor very weak interfacial adhesion was suitable for improvement in toughness. Debonding and fiber pull‐out mechanisms are reported to be the dominant energy absorption mechanisms in the case of weak interfacial bonding [63]. However, the pull‐out process was reported to involve little plastic deformation of surrounding matrix, leading to an energy absorption at low degree [54].…”

Section: Resultsmentioning

confidence: 99%

Mechanical properties of glass bead‐ and wollastonite‐filled isotactic‐polypropylene composites modified with thermoplastic elastomers

Balkan

Demirer

2010

Polymer Composites

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Mechanical properties of the isotactic-polypropylene/ glass bead (iPP/GB) and iPP/wollastonite (iPP/W) composites modified with thermoplastic elastomers, the poly(styrene-b-ethylene-co-butylene-b-styrene) copolymer (SEBS) and corresponding block copolymer grafted with maleic anhydride (SEBS-g-MA), were investigated. An increase in toughness of iPP with the elastomers was associated with a decrease in rigidity and strength. Mechanical performance of iPP increased more with acicular W than with spherical GB due to reinforcing effect of W. Comparing the (iPP/GB)/ SEBS and (iPP/W)/SEBS composites having the separate microstructure, strength and toughness values of the iPP/GB and iPP/W composites increased more with SEBS-g-MA at the expense of rigidity due to the coreshell microstructure with strong interfacial adhesion. Moreover, the iPP/W composite exhibited superior mechanical performance with 2.5 and 5 vol% of SEBSg-MA because of a positive synergy between the coreshell microstructure and reinforcing effect of acicular W. The extended models revealed that the elastomer and filler particles in the (iPP/GB)/SEBS and (iPP/W)/ SEBS composites acted individually due to the separate microstructure. However, the rigid GB and W particles encapsulated with the thick elastomer interlayer (R 0 /R 1 ¼ 0.91) in the (iPP/GB)/SEBS-g-MA and (iPP/W)/ SEBS-g-MA composites acted like neither big elastomer particles nor like individual rigid particles, inferring more complicated failure mechanisms in the core-shell composites. POLYM. COMPOS.

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“…[1][2][3][4][5][6][7][8][9] During the last few years, investigations of the melting and crystallization behavior of polypropylene have become a subject of increasing interest. However, its low mechanical properties compared with engineering thermoplastics creates problems in its successful end-use application in various fields.…”

Section: Introductionmentioning

confidence: 99%

Studies of Mechanical and Thermal Properties of Polypropylene/LLDPE-Copolymer Blends and Its Glass Fiber Compositions

Gupta

Saroop

Verma

2004

Polymer-Plastics Technology and Engineering

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The mechanical properties, melting, and crystallization behavior of a series of blends of polypropylene (PP) with varying percentages of linear low density polyethylene (LLDPE) copolymer and different fraction of glass fibers were investigated. In mechanical properties tensile and flexural strength, tensile and flexural modulus tends to decrease with increasing percentage of LLDPE copolymer, while a tremendous increase is observed in elongation at break. However, addition of glass fiber results in an increase in both tensile, flexural REPRINTS strength and modulus, especially at 30% glass fiber, where a manifold increase is observed, thereby, reversing the trend of decrease in the tensile properties on incorporation of elastomer. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) data reveals the decrease in crystallinity and crystallite size distribution on increasing % of LLDPE copolymer and glass fiber in the unfilled and glass-fiber-filled blend.

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Cited by 33 publications

References 17 publications

Preparation and performance characteristics of short‐glass‐fiber/maleated styrene–ethylene–butylene–styrene/polypropylene hybrid composites

Preparation and performance characteristics of short‐glass‐fiber/maleated styrene–ethylene–butylene–styrene/polypropylene hybrid composites

Mechanical properties of glass bead‐ and wollastonite‐filled isotactic‐polypropylene composites modified with thermoplastic elastomers

Studies of Mechanical and Thermal Properties of Polypropylene/LLDPE-Copolymer Blends and Its Glass Fiber Compositions

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