Microstructure and Deformation Behavior of Polyethylene/Montmorillonite Nanocomposites with Strong Interfacial Interaction

Ren, Changyi; Jiang, Zhiyong; Du, X.H.; Men, Yongfeng; Tang, Tao

doi:10.1021/jp9063164

Cited by 27 publications

(15 citation statements)

References 71 publications

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“…2000%). The deformation behavior of PE/P-MMTs nanocomposites has been reported in another work by us; 56 it was found that the synchronous improvements in stress and toughness were attributed to the synergistic movement of PE matrix and P-MMTs.…”

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confidence: 61%

The role of polymerizable organophilic clay during preparing polyethylene nanocomposite via filling polymerization

Ren

et al. 2010

J of Applied Polymer Sci

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Effect of polymerizable montmorillonites (P-MMTs) on the morphology of polyethylene/montmorillonites (PE/MMTs) nanocomposites during filling polymerization was studied. The microstructure analysis showed that the P-MMTs were more exfoliatable than nonpolymerizable MMTs in the preparation of PE/MMTs nanocomposites. By examining the influence of the polymerization condition on the microstructure of the resultant nanocomposites, it was confirmed that the shear force formed by the mechanical stirring was the driving force of the exfoliation dispersion of MMT sheets during the filling polymerization. Comparatively, the shear force on MMT sheets might be increased due to strong interaction between PE chains linked to the surface of P-MMTs and the solvents molecules, which is the reason that polymerizable clay is more exfoliatable than nonpolymerizable clay.The copolymerization between polymerizable modifier and ethylene was confirmed by NMR measurements. Furthermore, the morphology of the resultant nanocomposites was influenced by the concentration of the dispersed PMMTs. The degree of exfoliation of the resultant nanocomposites at a relatively low concentration was higher than that at a high concentration. This is because of the multiscale organization of the organoclay dispersed in the organic medium. High exfoliation degree of MMTs and improved interaction between PE matrix and P-MMTs in PE/P-MMTs nanocomposites led to significant improvements in mechanical properties and barrier properties.

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confidence: 61%

The role of polymerizable organophilic clay during preparing polyethylene nanocomposite via filling polymerization

Ren

et al. 2010

J of Applied Polymer Sci

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“…All reports revealed that low stretching temperature and high annealing or crystallization temperature encouraged the initiation and growth of cavities around the yield point. Furthermore, Ren et al . and Krajenta and Rozanski et al., found that the non‐crystallizable additives permeated into semi‐crystalline polymers (PE and iPP) affected the generation and development of cavities.…”

Section: Introductionmentioning

confidence: 99%

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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“…In fact, since the stiffness of the nanocomposite is reduced slightly and its toughness enhanced, it can be concluded that the active toughening mechanism is mainly crazing. Crazing is a kind of toughening mechanism that increases the toughness and decreases the stiffness, but is not valid for systems showing enhancement in both strength and toughness at the same time . The good dispersion of rubber particles (Fig.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of toughening mechanisms of polypropylene/ethylene–octene copolymer/maleic anhydride‐grafted poly(ethylene‐co‐octene)/clay nanocomposite

Bagheri-Kazemabad

Khavandi

Chen

2012

Polymer International

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The toughness of a polypropylene (PP)/ethylene‐octene copolymer (EOC)/maleic anhydride‐grafted poly(ethylene‐co‐octene) (EOC‐g‐MA)/clay nanocomposite and blends of PP/EOC and PP/EOC/EOC‐g‐MA was investigated using Charpy impact and single‐edge‐notch tensile (SENT) tests. In order to understand the toughening mechanisms, impact fracture surfaces and damage zones of single‐edge‐notch samples were studied with scanning electron microscopy and transmission optical microscopy, respectively. It was observed that the addition of EOC‐g‐MA to PP/EOC blend led to improvements in both impact strength and fracture energy of SENT tests because of the enhanced compatibility of the blend, which resulted from reduced EOC particle size and improved interfacial adhesion, and the decreased crystallinity of PP. The incorporation of clay to PP/EOC/EOC‐g‐MA blend caused a further increase of the toughness, owing to the greater decrease in the size of elastomer particles, to the presence of clay tactoids inside the elastomer phase and presumably to debonding of clay layers during the low‐speed SENT tests. The results of microscopic observations showed that the main toughening mechanism in PP/EOC/EOC‐g‐MA blend and PP/EOC/EOC‐g‐MA/clay nanocomposite is crazing. Copyright © 2012 Society of Chemical Industry

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Microstructure and Deformation Behavior of Polyethylene/Montmorillonite Nanocomposites with Strong Interfacial Interaction

Cited by 27 publications

References 71 publications

The role of polymerizable organophilic clay during preparing polyethylene nanocomposite via filling polymerization

The role of polymerizable organophilic clay during preparing polyethylene nanocomposite via filling polymerization

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Evaluation of toughening mechanisms of polypropylene/ethylene–octene copolymer/maleic anhydride‐grafted poly(ethylene‐co‐octene)/clay nanocomposite

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