Low-rate fracture behaviour of magnesium hydroxide filled polypropylene block copolymer

Velasco, José Ignácio; Morhain, C.; Arencón, D.; Santana, Oliverio J.; Maspoch, M. Ll.

doi:10.1007/s002890050409

Cited by 20 publications

(5 citation statements)

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“…Velasco et al . [ 105 ] found that the main crack propagation mechanism identified in these materials is ductile tearing, initiated by microvoids nucleation at the interfacial sites. This mechanism is more marked in the filled samples, due to their weak particle/matrix interface.…”

Section: Fracture Toughness Characterization Of Pp Microcompositesmentioning

confidence: 99%

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Fracture Toughness of Polypropylene-Based Particulate Composites

Arencón

Velasco

2009

Materials

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The fracture behaviour of polymers is strongly affected by the addition of rigid particles. Several features of the particles have a decisive influence on the values of the fracture toughness: shape and size, chemical nature, surface nature, concentration by volume, and orientation. Among those of thermoplastic matrix, polypropylene (PP) composites are the most industrially employed for many different application fields. Here, a review on the fracture behaviour of PP-based particulate composites is carried out, considering the basic topics and experimental techniques of Fracture Mechanics, the mechanisms of deformation and fracture, and values of fracture toughness for different PP composites prepared with different particle scale size, either micrometric or nanometric.

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Section: Fracture Toughness Characterization Of Pp Microcompositesmentioning

confidence: 99%

“… J-R curves and fracture surfaces obtained from neat PP and composites with magnesium hydroxide with filler contents of 40% and 60 wt.% (adapted from [ 105 ]). …”

Section: Fracture Toughness Characterization Of Pp Microcompositesmentioning

confidence: 99%

Fracture Toughness of Polypropylene-Based Particulate Composites

Arencón

Velasco

2009

Materials

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“…Reports in the literature indicate that impact resistance often decreases as an effect of wood reinforcement [38][39][40][41][42][43][44] similarly to many particulate filled composites [45][46][47][48][49][50][51].…”

Section: Fracture Toughnessmentioning

confidence: 99%

Tensile and impact properties of three-component PP/wood/elastomer composites

Keledi

Sudár

Burgstaller³

et al. 2012

Express Polym. Lett.

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Polypropylene (PP) was reinforced with wood flour and impact modified with elastomers to increase stiffness and impact resistance simultaneously. Elastomer content changed in four (0, 5, 10 and 20 wt%), while that of wood content in seven steps, the latter from 0 to 60 wt% in 10 wt% steps. Structure and adhesion were controlled by the addition of functionalized (maleated) polymers. Composites were homogenized in a twin-screw extruder and then injection molded to tensile bars. Fracture resistance was characterized by standard and instrumented impact tests. The results showed that the components are dispersed independently of each other even when a functionalized elastomer is used for impact modification, at least under the conditions of this study. Impact resistance does not change much as a function of wood content in PP/wood composites, but decreases drastically from the very high level of the PP/elastomer blend to almost the same value obtained without impact modifier in the three-component materials. Increasing stiffness and fiber related local deformation processes led to small fracture toughness at large wood content. Micromechanical deformation processes depend mainly on the strength of PP/wood interaction; debonding and pull-out take place at poor adhesion, while fiber fracture dominates when adhesion is strong. Composites with sufficiently large impact resistance cannot be prepared in the usual range of wood contents (50–60 wt%)

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“…Although platelet exfoliation was not clearly observed for this composite, a slightly better dispersion of the oHT particles could explain this enhancement, the opposite of what was observed for the PS composites. It has been reported that the addition of inorganic particles can increase G Ic of glassy polymers19, 38 and stabilize the crack propagation of semicrystalline polymers showing ductile instability 39–41. In the case of the SAN composite, this remarkable increase in G Ic can be attributed to plastic microdeformation during the fracture onset induced by the oHT platelets.…”

Section: Resultsmentioning

confidence: 96%

Effect of a dodecylsulfate‐modified magnesium–aluminum layered double hydroxide on the morphology and fracture of polystyrene and poly(styrene‐co‐acrylonitrile) composites

Realinho

Antunes

Arencón

et al. 2008

J of Applied Polymer Sci

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Composites of polystyrene (PS) and poly (styrene-co-acrylonitrile) (SAN) containing a fraction of a dodecylsulfate-modified Mg-Al layered double hydroxide (LDH) were prepared by means of a melt-extrusion process. The structure and morphology were analyzed with wide-angle X-ray scattering and transmission electron microscopy, respectively. The X-ray spectra of the PS matrix composite displayed the diffraction peak characteristic of the hybrid LDH basal plane at 2y ¼ 3.1 deg. The SAN matrix composite did not exhibit such a diffraction peak. Both PS and SAN composites displayed an intercalated type of morphology with respect to the LDH platelets, as assessed by transmission electron microscopy. A plasticizing effect due to the hybrid LDH particles was observed for all composites and was supported by a decrease in the glass-transition temperature values and by Fourier transform infrared spectra. Besides tensile properties, the fracture toughness of the composites was compared with that of the pure polymers through the linear elastic fracture mechanics parameters. They were determined from fracture tests under a three-point-bending configuration. The results indicated that the effect of adding a small fraction of modified LDH particles to SAN caused an improvement in fracture toughness of 50% with respect to that of the pure polymer. Moreover, the relative increase in the fracture energy was about 200%. For PS matrix composites, both tensile properties and linear elastic fracture mechanics fracture parameters remained unaffected. These results were explained on the basis of the different plasticities developed by both polymers around the particles.

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Low-rate fracture behaviour of magnesium hydroxide filled polypropylene block copolymer

Cited by 20 publications

References 0 publications

Fracture Toughness of Polypropylene-Based Particulate Composites

Fracture Toughness of Polypropylene-Based Particulate Composites

Tensile and impact properties of three-component PP/wood/elastomer composites

Effect of a dodecylsulfate‐modified magnesium–aluminum layered double hydroxide on the morphology and fracture of polystyrene and poly(styrene‐co‐acrylonitrile) composites

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