Morphology and properties alterations in cavitating and non-cavitating high density polyethylene

Krajenta, Artur; Różański, Artur; Idczak, R.

doi:10.1016/j.polymer.2016.09.068

Cited by 29 publications

(30 citation statements)

References 59 publications

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“…In our previous articles we have observed similar effects on polypropylene/nonadecane and polyethylene/nonadecane systems (with nonadecane contents amounting to 6–7 wt %), namely reduction of the yield stress and the melting temperature of crystals due to the presence of nonadecane. At the same time, after extraction process of nonadecane, both the melting temperature of crystals and the yield stress returned to the values characteristic to the pure material.…”

Section: Resultssupporting

confidence: 59%

“…The presence of nonadecane affects the mobility of molecular network of interlamellar regions. In the articles, we have observed a shift of glass transition temperature of polypropylene or change of intensity of β relaxation process of polyethylene, due to the presence of a low molecular weight modifiers (wax, nonadecane). Therefore, additional mechanical measurements with different deformation rates (1, 25, and 125 mm/min) were conducted for the reference material and PPnon5 blend.…”

Section: Resultsmentioning

confidence: 99%

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Miscible/partially‐miscible blends of polypropylene—the mechanisms responsible for the decrease of yield stress

Różański

2018

J Polym Sci B Polym Phys

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In miscible or partially-miscible blends of semicrystalline polymer/non-cocrystallizing low molecular weight component, a decrease of the value of yield stress in comparison to reference (pure) polymer is usually observed. On the example of model polypropylene/nonadecane systems, the mechanisms responsible for the decrease of the yield stress have been identified. It has been proved that during the deformation of polypropylene/nonadecane blends containing low amount of nonadecane (up to 5 wt %) the reduction of the yield stress is caused only by the swelling of interlamellar regions. In the case of the systems containing a moderate amount of nonadecane (7-10 wt %), the reduction of the yield stress is caused by the swelling of interlamellar regions and the reduction of the sample cross-section effectively participating in transferring of tensile stress. In blends containing nonadecane in the amount of 15-30 wt % the reduction of the yield stress is caused by the swelling of interlamellar regions and strong asymmetrization of nonadecane microdomains, resulting in localizing the deformation along interspherulitic regions and a drastic reduction of the content of polypropylene matrix, effectively participating in transferring of tensile stress between adjacent spherulites.

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Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Miscible/partially‐miscible blends of polypropylene—the mechanisms responsible for the decrease of yield stress

Różański

2018

J Polym Sci B Polym Phys

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“…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. Despite active researches focusing on the cavitation triggered around the yield point, an agreement on explaining the cavitation mechanism is still not yet reached.…”

Section: Introductionmentioning

confidence: 99%

“…In general, crystallinity, [2,3] crystalline structure and morphology, [4] chain orientation, [5,6] and the number of tie chains [7] in the inter-lamellar amorphous region can affect the mechanical performances of polymers. The testing environment acts as another parameter Ren et al [42] and Krajenta and Rozanski et al, [43][44][45] found that the non-crystallizable additives permeated into semi-crystalline polymers (PE and iPP) affected the generation and development of cavities. Despite active researches focusing on the cavitation triggered around the yield point, an agreement on explaining the cavitation mechanism is still not yet reached.…”

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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“…It was because that the tensile strength and elongation at break happened in large deformation region. At this region, the cavitation and microfibrillation was formed in the polymer matrix . For the iPP/5.0 wt% SGFs composites, the SGFs probably caused more serious cavitation than that of pure iPP systems.…”

Section: Resultsmentioning

confidence: 98%

Uniform fiber orientation and transcrystallization formed in isotactic polypropylene/short glass fiber composites via a shear‐induced orientation extrusion

Yin

Shi

et al. 2017

Polymer Composites

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The orientation of short glass fibers (SGFs) and the interfacial interaction between SGFs and isotactic polypropylene (iPP) matrix play main roles in the final properties of the iPP/SGFs composites. Here we show a self-design shear-induced orientation extrusion (SIOE) to efficiently fabricate the iPP/SGFs composites with evenly dispersion and orientation of SGFs in the whole iPP matrix. The shear stress and the orientation of SGFs are also benefit to induce transcrystals which enhance the interfacial interaction between SGFs and iPP matrix. The crystallinity in average of the iPP/5.0 wt% SGFs composites shows nearly 10% higher than that of pure iPP extruded by the SIOE system. The iPP/ 5.0 wt% SGFs composites extruded by high shear stress not only exhibit higher yield strength and Young's modulus than that of the composites extruded by low shear stress but also maintain high tensile strength and strain at break. The enhancement of mechanical properties is ascribed to the uniform dispersion and orientation of SGFs, high crystallinity, and high interfacial interaction between SGFs and iPP matrix induced by transcrystals. POLYM. COMPOS., 00:000-000, high interfacial interaction between SGFs and iPP matrix induced by transcrystals. POLYM. COMPOS., 39:3168-3177, 2018. FIG. 3. The optical micrographs of the iPP/5.0 wt% SGFs composites extruding with 0 OE (a, a 0 ), 2 OEs (b, b 0 ), 6 OEs (c, c 0 )and 8 OEs (d, d 0 ). The observation direction for a, b, c and d is vertical to the flow direction, while the observation direction for a 0 , b 0 , c 0 and d 0 is parallel to the flow direction. The scar bar for all images is 200 lm.FIG. 4. Non-isothermal crystallization of the iPP/5.0 wt% SGFs composites extruded with different number of OEs, including crystallization (a) and melting (b) curves. FIG. 5. The XRD spectra of the iPP/5.0 wt% SGFs composites extruded with different number of OEs. 6 POLYMER COMPOSITES-2017

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Morphology and properties alterations in cavitating and non-cavitating high density polyethylene

Cited by 29 publications

References 59 publications

Miscible/partially‐miscible blends of polypropylene—the mechanisms responsible for the decrease of yield stress

Miscible/partially‐miscible blends of polypropylene—the mechanisms responsible for the decrease of yield stress

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Uniform fiber orientation and transcrystallization formed in isotactic polypropylene/short glass fiber composites via a shear‐induced orientation extrusion

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