Microvoid formation process during the plastic deformation of β-form polypropylene

Feng, Cheng; Yamaoka, Tetsuji; Ide, H.; Kimura, Yoshiharu

doi:10.1016/0032-3861(94)90906-7

Cited by 78 publications

(59 citation statements)

References 9 publications

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“…The lamellar bundles can be easily separated from each other by subjecting to mechanical loading, leading to the formation of microcrazes and microfibrils. Such unique morphology of β-form spherulites renders the polypropylene to possess superior impact strength and tensile ductility [30,31,36].…”

Section: Mechanism Of β-Pp Nucleationmentioning

confidence: 99%

Structure and Mechanical Behavior of Isotactic Polypropylene Composites Filled with Silver Nanoparticles

Tjong

Bao

2007

E-Polymers

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Isotactic polypropylene (PP) nanocomposites containing 0.1, 0.3, 0.5 and 1.0 wt % silver (Ag) nanoparticles were prepared via melt compounding in a twin-screw extruder followed by injection molding The effects of the Ag nanoparticle additions on the structure and mechanical behavior of PP were studied using DSC, WXRD, optical microscopy, tensile and Izod impact techniques. DSC and WXRD measurements showed that the addition of only 0.1 wt% Ag nanoparticles promote the formation of β-form PP. Further increasing Ag content would not lead to additional increase of the β-PP phase content. The induced β-form PP phase is beneficial to enhance the impact strength and tensile ductility of the PP/Ag nanocomposites.

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Section: Mechanism Of β-Pp Nucleationmentioning

confidence: 99%

Structure and Mechanical Behavior of Isotactic Polypropylene Composites Filled with Silver Nanoparticles

Tjong

Bao

2007

E-Polymers

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“…6a), it is Table 3 The morphological characteristics of the PP-110 and PP-135 after rapid annealing treatments. clear to see that there were few pores in the surface, mainly due to its low stability of β-crystal that would lead to the rapid β-α transformation and the serious shrinkage which consequently reduce the porosity [22][23][24]. Meanwhile, a great number of great pores were observed to distribute randomly in PP-135 membranes (seen in Fig.…”

Section: Stress-strain Behaviors and Performances Of β-Ipp Membranes mentioning

confidence: 90%

“…6c shows that after a sequential biaxial stretching, abundant micropores appeared in PP-110 with T a =135°C, which was consistent with the results of several related studies. Chu [22][23][24] revealed that stable β-crystals in the larger crystallites could hinder the volume shrinkage and enlarge the pores efficiently. Grant [46] also suggested that the porosity of β-iPP under stretching depended on the quantity of perfected β crystalline material in the film.…”

Section: Stress-strain Behaviors and Performances Of β-Ipp Membranes mentioning

confidence: 99%

“…On the other hand, the β-iPP has been widely used to fabricate porous membrane for lithium-ion battery separator through a successively biaxial stretching, for the less dense β-crystal (0.921 g/cm 3 ) is likely to transform into more dense α-crystal (0.936 g/cm 3 ) during stretching, leading to the volume contraction and consequent formation of micropores [17,[22][23][24][25][26][27][28]. However, up to now, the separator made from biaxial stretching of β-iPP is still much poorer than those produced through "dry uniaxial stretch" [29][30][31] and "wet biaxial stretch" [32], leading to the limit of its applications in high tech fields such as power battery.…”

Section: Introductionmentioning

confidence: 99%

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Influence of annealing on stress–strain behaviors and performances of β nucleated polypropylene stretched membranes

Xiang

Cao

et al. 2014

J Polym Res

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In this article, two β nucleated polypropylene (β-iPP) precursor films were prepared through crystallizing at 110 and 135°C. The differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM) and tensile testing were employed to investigate the influence of annealing on stress-strain behaviors and performances of biaxial stretched membranes. The traditional time consuming annealing treatment demonstrates that within the most favorable annealing temperature window of 130-140°C, only a small fraction of thin β lamellae melted and recrystallized to form more stable β phase, resulting in the slight improvement of the stress-strain behaviors and performances of β-iPP membranes. Furthermore, a rapid annealing method was designed, involving a short time thermal stimulus at high temperature and then cooling in the air. During this process, substantial melting and epitaxial crystallization of less stable β crystal occurred, leading to the apparent thickening of β lamellae and the narrowing of β lamellar thickness distribution. Consequently, the stress-strain behaviors of β-iPP films and performances of biaxial stretched membranes were improved significantly.

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“…The β-iPP spherulites were deformed plastically up to large deformation. Chu [14] prepared iPP films containing more than 90% β-iPP. These samples crystallized under either isothermal or nonisothermal conditions.…”

Section: Role Of Crystal Formmentioning

confidence: 99%

Cavitation Behavior of Semi-Crystalline Polymers during Uniaxial Stretching Studied by Synchrotron Small-Angle X-Ray Scattering

Chang¹,

Schneider²,

Kuehnert³

et al. 2018

Small Angle Scattering and Diffraction

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Cavitation appears in many semi-crystalline polymers when they are subjected to uniaxial stretching above their glass transition temperatures. Generally, the formation of voids is influenced by the morphology of semi-crystalline polymers, including their lamellae thickness, lamellae orientation, as well as the arrangement of the amorphous phase. Upon stretching, the size of the voids changes as a function of the local strain. Synchrotron small-angle X-ray scattering (SAXS) can be used as a powerful method to in-situ monitor the evolution of voids with high time and spatial resolution. In this chapter, recent reports about the cavitation behavior of semi-crystalline polymers studied by SAXS are reviewed. Afterwards, the theoretical background related to the SAXS technique is introduced. Lastly, some exemplary results about the cavitation behavior of microinjection-molded isotactic-polypropylene, studied by synchrotron SAXS measurements, are presented.

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Microvoid formation process during the plastic deformation of β-form polypropylene

Cited by 78 publications

References 9 publications

Structure and Mechanical Behavior of Isotactic Polypropylene Composites Filled with Silver Nanoparticles

Structure and Mechanical Behavior of Isotactic Polypropylene Composites Filled with Silver Nanoparticles

Influence of annealing on stress–strain behaviors and performances of β nucleated polypropylene stretched membranes

Cavitation Behavior of Semi-Crystalline Polymers during Uniaxial Stretching Studied by Synchrotron Small-Angle X-Ray Scattering

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