Description of second flow field via the deformation of polystyrene phase in high‐density polyethylene matrix

Zhang, Quanping; Xia, Xiaochao; He, Shan; Feng, Jianmin; Yang, Ming‐Bo; Li, Yintao; Zhou, Yanyan

doi:10.1002/app.43374

Cited by 4 publications

(2 citation statements)

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“…When PS content is 10 or 20 wt %, the particles deform then develop into fibrils because of the shearing and arrange regularly. 33 The diameter of the fibrils in Figure 5a−d concentrates at 0.4−1 μm. When the PS content increases to 30 wt %, the particles tend to coalesce and agglomerate, leading to the average diameter rapidly increasing.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

“…Fully extended, compact nanofibrils that are embedded in the matrix are clearly observed, showing an extremely high aspect ratio and orientation degree along the injection direction. When PS content is 10 or 20 wt %, the particles deform then develop into fibrils because of the shearing and arrange regularly . The diameter of the fibrils in Figure a–d concentrates at 0.4–1 μm.…”

Section: Resultsmentioning

confidence: 99%

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Insight into Understanding the Influence of Blending Ratio on the Structure and Properties of High-Density Polyethylene/Polystyrene Microfibril Composites Prepared by Vibration Injection Molding

Jiang

Wang

et al. 2018

Ind. Eng. Chem. Res.

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To achieve the goal of preparing an in situ microfibril composite (MFC), multiple strong shear flows were imposed on the melt of high-density polyethylene (HDPE)/polystyrene (PS). During vibration injection molding (VIM), both phase morphology and crystalline structure show big differences from the common injection molding (CIM) samples. The PS phase would deform into ultrafine microfibrils and then absorb the HDPE matrix to form a shishkebab super crystalline structure. The morphology analysis shows that when PS content increases, the size and morphology would change correspondingly. When PS content reaches a certain level, it would impair the mechanical performance. This work also analyzes the relationship between blending ratio and crystalline structure and explains the difference. These results provide valuable insight into immiscible polymer systems under a shearing field and have future industrial prospects.

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Section: ■ Results and Discussionmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Insight into Understanding the Influence of Blending Ratio on the Structure and Properties of High-Density Polyethylene/Polystyrene Microfibril Composites Prepared by Vibration Injection Molding

Jiang

Wang

et al. 2018

Ind. Eng. Chem. Res.

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Temperature and shear rate distributions of gas‐assisted injection molded (GAIM) polypropylene and the application in forecast of cooling time

Yang

Ding

Shi

et al. 2018

J of Applied Polymer Sci

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An umbrella handle product of polypropylene molded by gas‐assisted injection molding (GAIM) was studied from both aspects: theoretical modeling and simulation as well as in situ temperature measurement. The simulation was primarily through the use of the commercial software Moldflow (version 6.1) coupled with enthalpy transformation method (ETM) in an attempt to investigate the shear rate and temperature fields during GAIM process. A four‐parameter model (FPM) was used to nonlinearly fit the temperature decays during the GAIM cooling stage on the basis of a three‐parameter model (TPM) raised previously in our group. The FPM showed perfect fitting effect as well as presented fairly acceptable cooling time (tc) prediction in comparison to experimental data, which could better reflect the nature of crystalline polymers during melt crystallization process. The understanding of the shear rate and temperature fields would be of practical importance to the further research on relationship of “processing–structure–property” as well as the optimization of cooling parameters for industrial GAIM operations of crystalline polymers. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47390.

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Strong shear-driven large scale formation of hybrid shish-kebab in carbon nanofiber reinforced polyethylene composites during the melt second flow

Xia

Yang

Liu

et al. 2016

Phys. Chem. Chem. Phys.

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The formation of a hybrid shish-kebab (HSK) structure with different degrees of lamellar orientations was first observed in the solution crystallization of polyethylene (PE) in the presence of carbon nanofibers (CNFs). In this study, PE crystal lamellae were periodically decorated on the surface of CNFs and were aligned approximately perpendicular to the long axes of the CNFs, forming aligned hybrid shish-kebab nanostructures. More importantly, the fascinating structure was directly formed in all regions of the injection molded bars of HDPE/CNF composites, via a gas-assisted injection molding (GAIM), instead of the shell-core structure. In the GAIM process, an intense shear was imposed onto the melt during the melt second flow and drove PE chains to orient along the axes of the CNFs. Then the entropy penalty for PE chains deposited on the CNF surface was drastically decreased. Although the attractive van der Waals interactions were weak, the oriented PE chains could successfully adsorb on the CNF surface due to the decrease of the entropy penalty, therewith the underlayer coating was formed along the axis based on a two-dimensional mode for early nucleation on the CNF surface. Subsequently, subglobules appeared on the ordered structure, which could be regarded as the crystal nucleus. Finally, the oriented PE chains began to epitaxially grow from the subglobules with a folded-chain shape to decrease the polymer surface energy and grew perpendicular to the CNFs long axis, abiding by the "soft epitaxy" crystallization mechanism regardless of strict lattice matching.

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Description of second flow field via the deformation of polystyrene phase in high‐density polyethylene matrix

Cited by 4 publications

References 40 publications

Insight into Understanding the Influence of Blending Ratio on the Structure and Properties of High-Density Polyethylene/Polystyrene Microfibril Composites Prepared by Vibration Injection Molding

Insight into Understanding the Influence of Blending Ratio on the Structure and Properties of High-Density Polyethylene/Polystyrene Microfibril Composites Prepared by Vibration Injection Molding

Temperature and shear rate distributions of gas‐assisted injection molded (GAIM) polypropylene and the application in forecast of cooling time

Strong shear-driven large scale formation of hybrid shish-kebab in carbon nanofiber reinforced polyethylene composites during the melt second flow

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