Insight into unique deformation behavior of oriented isotactic polypropylene with branched shish-kebabs

Chen, Yanhui; Fang, Dufei; Hsiao, Benjamin S.; Li, Zhong‐Ming

doi:10.1016/j.polymer.2015.01.058

Cited by 36 publications

(25 citation statements)

References 80 publications

(77 reference statements)

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“…In the previous study, it was found the following: Under uniaxial tension conditions, shish‐kebab crystals were formed due to shear action when the melt was cooled and crystallized, and numerous S‐C structure crystals were formed between two adjacent layers (040 plane) in kebab lamellae. The mechanism of formation and the locations of these S‐C structures were similar to those of branched lamellae obtained by Chen et al when studying oriented isotactic PP and a strong shear flow …”

Section: Resultssupporting

confidence: 82%

“…The mechanism of formation and the locations of these S-C structures were similar to those of branched lamellae obtained by Chen et al when studying oriented isotactic PP and a strong shear flow. 23 Positron annihilation analysis also proved that there is a larger number of cavitation with a large diameter in the modified BOPP.…”

Section: Changes Of Bopp Film Morphology Before and After Modificationmentioning

confidence: 87%

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Crystalline structure and morphology of biaxially oriented polypropylene film under the coexistence of organic silica particles and its influence on the adsorption diffusion of polar solvent molecules

Zhang

et al. 2018

Packag Technol Sci

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In this article, a silica/EVA/PP composite was prepared by melt‐blending nanosilica with polypropylene, and a surface‐modified BOPP film was prepared by using this as raw material. SEM studies have shown the special microscopic morphology of the surface and its cross section. X‐ray diffraction (XRD) characterized and analysed crystallinity, molecular orientation, and grain size in the modified film. Furthermore, the presence of microholes in the modified film was verified by positron annihilation spectroscopy. The results show that compared with the unmodified films, the modified BOPP films have higher crystallinity and smaller grain size. Its dense surface structure and reticular fibre bundle structure make the diffusion coefficient and solubility of ethyl acetate small in the film. The mechanical properties, barrier properties, heat resistance, and ink adhesion of this film have been significantly improved. Modified film can be used as the food packaging film which has high performance and low residue.

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Section: Resultssupporting

confidence: 82%

Section: Changes Of Bopp Film Morphology Before and After Modificationmentioning

confidence: 87%

Crystalline structure and morphology of biaxially oriented polypropylene film under the coexistence of organic silica particles and its influence on the adsorption diffusion of polar solvent molecules

Zhang

et al. 2018

Packag Technol Sci

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“…Nanoparticles can alter the development of crystallinity within polymer nanocomposites by acting as heterogeneous nuclei, increasing the nucleation rate and leading to an increase of crystallinity and decrease of crystallite sizes . While such changes in crystallinity have typically been observed with CNTs under quiescent conditions, it is known that the application of a shear stress to a pure polymer melt at temperatures in the vicinity of the crystallization temperature can lead to the shear‐induced orientation of the macromolecules leading to changes in their crystallization dynamics . Previously it has been investigated how nanoparticle concentration, geometry, and surface/volume ratio may influence the crystallization resulting from shear‐induced crystallization .…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, it is known that the application of a shear stress to a pure polymer melt at temperatures in the vicinity of the crystallization temperature leads to the shear-induced orientation (SIC) of the macromolecules. 20,21 In this regard, previous studies have indicated that shear-induced crystallization behavior is sensitive to the volume loading of the nanoparticles. 4,11,22 Because the nanoparticles act as heterogeneous nucleating agents and thus facilitate the crystallization process, a higher weight volume loading of well-dispersed nanoparticles results in more nuclei available for crystallization.…”

Section: Introductionmentioning

confidence: 98%

“…Furthermore, it is known that the application of a shear stress to a pure polymer melt at temperatures in the vicinity of the crystallization temperature leads to the shear‐induced orientation (SIC) of the macromolecules . In this regard, previous studies have indicated that shear‐induced crystallization behavior is sensitive to the volume loading of the nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

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Effect of multistage sonication on dispersive mixing of polymer nanocomposites characterized via shear‐induced crystallization behavior

Ganapathi

Kalyon

Fisher

2016

J of Applied Polymer Sci

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While nanoparticle dispersion is necessary to achieve optimal properties, it has long been recognized as a major technological hurdle for polymer nanocomposites. Here, a systematic study incorporated carbon nanotubes (CNTs) in polycaprolactone (PCL) using a multi‐stage sonication process, with Stage 1 sonication of CNT/solvent followed by Stage 2 sonication of the pre‐processed CNT/solvent with the dissolved polymer. Conventional dispersion characterization techniques were complemented with analysis of the shear‐induced crystallization (SIC) behavior of the semicrystalline nanocomposite, which was found to be particularly sensitive to the state of nanoparticle dispersion. While Stage 1 sonication was found to have a pronounced effect on the nanoparticle dispersion as characterized via SIC and thermal characterization, the impact of Stage 2 sonication on the level of nanoparticle dispersion was much smaller. Such results demonstrate the utility of characterization of the shear‐induced crystallization behavior as a means to analyze nanoparticle dispersion in semicrystalline polymer nanocomposites. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44681.

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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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Insight into unique deformation behavior of oriented isotactic polypropylene with branched shish-kebabs

Cited by 36 publications

References 80 publications

Crystalline structure and morphology of biaxially oriented polypropylene film under the coexistence of organic silica particles and its influence on the adsorption diffusion of polar solvent molecules

Crystalline structure and morphology of biaxially oriented polypropylene film under the coexistence of organic silica particles and its influence on the adsorption diffusion of polar solvent molecules

Effect of multistage sonication on dispersive mixing of polymer nanocomposites characterized via shear‐induced crystallization behavior

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

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