Microscopic deformation behavior of hard elastic polypropylene during cold-stretching process in fabrication of microporous membrane as revealed by synchrotron X-ray scattering

Matsui, Kazuya; Hosaka, Nao; Suzuki, Kenta; Shinohara, Yuya; Amemiya, Yoshiyuki

doi:10.1016/j.polymer.2015.06.034

Cited by 20 publications

(15 citation statements)

References 26 publications

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“…This indicates that small room-temperature stretching improves the structure periodicity, due to the occurrence of possible lamellae slipping. The similar situation was also reported by Matsui et al [17] that the integrated intensity of SAXS profile along the stretching direction was increased at initial stretching stage. At stretching ratio of 30 %, the lamellar structure shows maximum periodicity.…”

Section: Resultssupporting

confidence: 89%

“…Here, the pore initialization was attributed to the stretching and scission of short tie chains. Matsui et al [17] used time-resolved simultaneous wide-and small-angle X-ray scattering measurements to follow the cold stretching process. The result showed that the voids appeared after the amorphous region were stretched, at the same time, the lamellae crystals were deformed by bending.…”

Section: Introductionmentioning

confidence: 99%

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The study of room-temperature stretching of annealed polypropylene cast film with row-nucleated crystalline structure

Chen

Xie

et al. 2016

Polymer

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The room-temperature stretching process of polypropylene annealed film with rownucleated crystalline structure was studied by in-situ small-angle X-ray scattering (SAXS) setup and off-line wide-angle X-ray scattering (WAXS), temperature-modulated differential scanning calorimetry (TMDSC) and stress-strain curves testing. The formation process of initial connecting bridges and pores was clarified. For the annealed film, except for the initial lamellae structure, the recrystallized part formed by the melting and crystallization of imperfect crystals during annealing, tie chains connecting the lamellae structure among the amorphous region, secondary crystals from the crystallization of tie chains during annealing and daughter crystals from the special cross-hatched crystalline structure of PP coexist. It was found that 10 % stretching lead to the pronounced increase of long period and the appearance of a few initial connecting bridges. The stretching of daughter crystal and recrystallized part contributed to the formation of initial bridges. At stretching ratio of 30 %, uniform distributed connecting bridges were observed and the stretched film showed maximum structure periodicity. At this stretching ratio, except for the stretching of daughter crystal, the stretching of tie chains and secondary crystals within the amorphous region lead to the formation of more connecting bridges. At higher stretching ratios into the strain-hardening region and beyond the second yield point, except for the stretching of the above mentioned crystalline

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

The study of room-temperature stretching of annealed polypropylene cast film with row-nucleated crystalline structure

Chen

Xie

et al. 2016

Polymer

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“…proposed that the amorphous phase at the equatorial part of spherulite is the initial place for generating cavities . Although both models have been strongly supported by experimental results, most of investigations about cavitation mechanism in semi‐crystalline polymers from other groups prefer to follow the opinion addressed by Pawlak and Galeski. However, direct evidences of confirming the cavities initially produced in the amorphous phase are not yet provided.…”

Section: Deformation Mechanisms Of Semi‐crystalline Polymersmentioning

confidence: 98%

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Men

2018

Macro Materials & Eng

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Cavitation‐induced stress whitening in semi‐crystalline polymers during stretching significantly influences the physical properties of the materials. This review summarizes studies focusing on two different cavitation processes triggered at small and large strain regimes. The corresponding mechanisms of these two cavitation processes are discussed. For cavitation activated at small strain, there are two basic but distinctly different models with the initiation of cavities either in the amorphous phase or in the crystalline skeleton. For the cavitation triggered at a large strain regime, there are also two different arguments being either due to the defects located in the ends of micro‐fibrils or as a consequence of the fragmentation of load‐bearing inter‐fibril/micro‐fibril tie chains in highly oriented amorphous networks. A unified understanding of the cavitation processes during stretching semi‐crystalline polymers based on interpenetrated network model is proposed. Finally, this review outlooks future research topics for better understanding the cavitation mechanism to meet the industrial need.

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“…And the low cold‐drawing strain is not enough to induce the formation 25 . At the same time, the cold‐drawing strain cannot be higher than the second yield point of polymer to avoid lamellae failure and micropore structure collapse 26–28 . And cold‐drawing also has a great influence on the final properties of microporous membrane 17 …”

Section: Introductionmentioning

confidence: 99%

The cavitation development of poly(4‐methyl‐1‐pentene) casting films studied by in situ small angle X‐ray scattering

Jiang

Wang³

et al. 2020

J of Applied Polymer Sci

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In this paper, the on‐line small angle X‐ray scattering/wide‐angle X‐ray scattering (SAXS/WAXS) characterization method was adopted to study the morphology evolution of poly(4‐methyl‐1‐pentene) casting films during stretching. In this process, the lamellae structure was destroyed. And “bridge structure” was generated in the amorphous region. The scattering pattern changed obviously before and after cavities orientation. Stretching temperature and stretching speed mattered for the size of micropores. Low temperature helped generate more and larger voids. The faster stretching speed can improve the generation of cavities, enlarged cavitation number and helped its reorientation. These results provide the basic knowledge of how to produce poly(4‐methyl‐1‐pentene) microporous membranes with high electrochemical performance.

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Microscopic deformation behavior of hard elastic polypropylene during cold-stretching process in fabrication of microporous membrane as revealed by synchrotron X-ray scattering

Cited by 20 publications

References 26 publications

The study of room-temperature stretching of annealed polypropylene cast film with row-nucleated crystalline structure

The study of room-temperature stretching of annealed polypropylene cast film with row-nucleated crystalline structure

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

The cavitation development of poly(4‐methyl‐1‐pentene) casting films studied by in situ small angle X‐ray scattering

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