Fracture behaviour of polypropylene films at different temperatures: assessment of the EWF parameters

Ferrer‐Balas, Didac; Maspoch, M. Ll.; Martínez, Alejandro Rosillo; Ching, Emma C. Y.; Li, Robert K.Y.; Mai, Yiu‐Wing

doi:10.1016/s0032-3861(00)00603-0

Cited by 70 publications

(52 citation statements)

References 29 publications

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“…In studies performed (i) below glass transition temperature (see e.g. [19][20][21][22]) the previously mentioned entropyelastic deformations dominate the failure, thus similar observations can be made than in case of amorphous thermoplastics and elastomers [17]. The other group of investigations includes materials, which were tested (ii) above their glass transition temperature, like polyethylenes [23,24], polypropylenes [19,20,[25][26][27][28], polyesters [21], poly(vinylidenefluoride) [29], etc.…”

mentioning

confidence: 76%

Towards the understanding of the molecular weight dependence of essential work of fracture in semi-crystalline polymers: A study on poly(ε-caprolactone)

Tuba¹,

Oláh²,

Nagy³

2014

Express Polym. Lett.

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Abstract. The plane-stress ductile fracture of poly(#-caprolactone) (PCL) has been investigated as a function of molecular weight and related crystalline structure. Because of the interacting effects in semi-crystalline polymers a separate study of a given structural parameter is rather challenging. Nevertheless, this polymer seems to be a good model material to study the effect of molecular weight on the essential work of fracture, as the interactions between the separate parameters, at room temperature, are negligible. The molecular characteristics of PCL were determined by size exclusion chromatography. To confirm the entangled molecular structure of studied polymers rheological measurements were performed. The crystalline morphology has been characterized by differential scanning calorimetry and wide angle X-ray diffraction. Quasi-static tensile tests and essential work of fracture tests were performed to study the mechanical behavior. Based on the experimental observations an empirical model has been proposed to outline the molecular weight and crystallinity dependence of the essential work of fracture in this semi-crystalline polymer.

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mentioning

confidence: 76%

Towards the understanding of the molecular weight dependence of essential work of fracture in semi-crystalline polymers: A study on poly(ε-caprolactone)

Tuba¹,

Oláh²,

Nagy³

2014

Express Polym. Lett.

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“…The same materials were already the object of previous works of our group. 6,7 The EC of the EPBC was determined by FTIR. The grades were chosen with the most similar melt flow indexes (MFI) available, to use the same processing conditions with all of them.…”

Section: Experimental Materialsmentioning

confidence: 99%

Influence of processing on ethylene‐propylene block copolymers: Structure and mechanical behavior

Maspoch¹,

Gámez‐Pérez²,

Giménez³

et al. 2004

J of Applied Polymer Sci

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Thin plaques (1, 2, and 3 mm) made of polypropylene homopolymer (iPP) and three ethylene propylene block copolymers (EPBC) with different ethylene content (5.5, 7.4, and 12% in weight) have been obtained by different processing methods (injection molding, injection and annealing, and compression molding). The morphology of the plaques has been studied using polarizing microscopy (PLM), differential scanning calorimetry (DSC), and wideangle X-ray scattering (WAXS). The results have been related with the mechanical properties of the plaques (MD and TD directions) in tension loading tests. We show the influence of the ethylene content, thickness, and processing method and conditions in the final morphology and how they affect the mechanical behavior. This knowledge can be used to tailor the final properties of a piece.

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“…The schematic drawing of double plastic zone is shown in Figure 8 Ferrer-Balas et al 25 claimed that the stress-whitening effect is due to the appearance of a large number of holes (1 mm diameter) in the bulk material. Previous works showed that double plastic zone phenomenon was not visible for all materials and it was only reported in studies on the fracture behaviors of block copolypropylene 25,26 and blend of iPP/EPR. 27 The value of b can be determined by the ratio of h (height of plastic zone) to l, as recommended in the first EWF protocol version.…”

Section: Plastic Deformationmentioning

confidence: 98%

Effect of annealing on fracture behavior of poly(propylene‐block‐ethylene) using essential work of fracture analysis

Xie

Yang

et al. 2006

J of Applied Polymer Sci

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The influence of annealing conditions on the fracture behavior of poly(propylene-block-ethylene) sheets was investigated by means of the essential work of fracture method, and was complemented by the study of the effect of annealing on crystal structure, using differential scanning calorimetry. It was shown that both the crystal perfection degree and crystallinity could be improved substantially as annealing temperature (Ta) increased, while the prolonged annealing time at 808C mainly resulted in the improvement of crystallinity. The reasons for an increase in the specific essential work of fracture and a decrease in the specific plastic work item as crystal perfection degree and crystallinity grew are discussed. The displacement to failure of double edge notched tension specimens decreased gradually with increasing T a , and the double-plastic zone could be observed in all specimens. In addition, a novel method to aid the accurate measurement of intense stress-whitening outer plastic zone height by adjustment of illumination conditions is proposed.

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Fracture behaviour of polypropylene films at different temperatures: assessment of the EWF parameters

Cited by 70 publications

References 29 publications

Towards the understanding of the molecular weight dependence of essential work of fracture in semi-crystalline polymers: A study on poly(ε-caprolactone)

Towards the understanding of the molecular weight dependence of essential work of fracture in semi-crystalline polymers: A study on poly(ε-caprolactone)

Influence of processing on ethylene‐propylene block copolymers: Structure and mechanical behavior

Effect of annealing on fracture behavior of poly(propylene‐block‐ethylene) using essential work of fracture analysis

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