Rheological behavior of polymer/layered silicate nanocomposites under uniaxial extensional flow

Park, Jun Uk; Kim, Jeong Lim; Kim, Do Hoon; Ahn, Kyung Hyun; Lee, Seung Jong; Cho, Kwang Soo

doi:10.1007/bf03219088

Cited by 37 publications

(24 citation statements)

References 19 publications

(30 reference statements)

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“…Shear and extensional flows are the dominating forces when referring to orientation of fillers in composites under flow. It has been demonstrated that anisotropic particles such as short fibers, rods, and nanotubes can be aligned through extrusion and injection molding [11,18] which are shear dominant processes, and through fiber spinning or postelongation processes in which extensional flow is observed [20,21,30,31]. In this section, both approaches will be reviewed.…”

Section: Flow-assisted Alignment Of Particles In Polymer Compositesmentioning

confidence: 99%

Strategies for the preparation of polymer composites with complex alignment of the dispersed phase

Sierra-Romero

Chen

2018

Nanocomposites

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The design and production of anisotropic composites and nanocomposites has become increasingly relevant in materials science and engineering because they provide an opportunity of enhancing and adapting the properties of a material for specialized applications. This article reviews the strategies that have been developed to achieve anisotropy based on the position and orientation of the dispersed phase in polymer composites including polymer nanocomposites. Flow and electric field-driven alignment methodologies are briefly described, which is followed by a focus on magnetically oriented composites. The use of magnetic fields for this purpose has been of particular interest in recent years due to its ease of use and the variety of materials on which this method can be applied. Strong magnetic fields are required to align diamagnetic fillers. However, the modification of particles with low magnetic susceptibilities with magnetic nanoparticles (i.e. iron oxide nanoparticles) has been proven to be a successful approach to broaden the capabilities of magnetic alignment in polymer composites. The development of filler manipulation techniques opens the possibility to mimic complex biological structures that promise to improve the mechanical properties of bioinspired composites and even achieve advanced functionalities in self-shaping materials for example.

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Section: Flow-assisted Alignment Of Particles In Polymer Compositesmentioning

confidence: 99%

Strategies for the preparation of polymer composites with complex alignment of the dispersed phase

Sierra-Romero

Chen

2018

Nanocomposites

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“…[33][34][35][36] Typical industrial processes where stretching ow occurs are blow moulding, extrusion coating, melt spinning, thermoforming and blown lm extrusion. Although the melt extensional rheology for various homopolymers such as PP, 37-39 low-density polyethylene (LDPE), 40 HDPE, 41 polymer blends 42,43 and polymeric composites [44][45][46][47][48][49] has been reported but to the best of our knowledge melt extensional properties of polyethylene/sepiolite composites has not been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

High-density polyethylene/needle-like sepiolite clay nanocomposites: effect of functionalized polymers on the dispersion of nanofiller, melt extensional and mechanical properties

et al. 2016

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The present article reports the preparation of high density polyethylene (HDPE)/sepiolite-clay nanocomposites with improved mechanical performance and melt extensional properties by melt compounding using a co-rotating twin screw extruder. Maleic anhydride grafted high density polyethylene (HDPE-g-MA) (having different MFI and maleic anhydride content) was used as compatibiliser to investigate systematically the effect of polarity and molecular weight on the properties of HDPE/sepiolite nanocomposites. The influence of sepiolite loading (1-10 wt%) and type of compatibilizer on morphological, mechanical and melt extensional properties (melt strength, drawability and extensional viscosity) were investigated and analyzed. Sepiolite-clay significantly enhanced the mechanical properties, melt strength and extensional viscosity with slight reduction in drawability at 10% w/w loading. For example, $40% increase in tensile modulus and $50% improvement in flexural modulus was obtained at 10% w/w sepiolite loading. The compatibiliser having lower MFI showed significant improvement in melt extensional properties as compared to compatibiliser having higher MFI.Scanning electron microscopy and transmission electron microscopy revealed the better dispersion of sepiolite in the presence of compatibiliser, however it was much better when HDPE-g-MA having higher MFI was used as compared to compatibiliser having lower MFI. Thermal stability increased in the presence of sepiolite which was further improved in the presence of compatibiliser.

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“…In previous studies, carbon black particles [18,19], carbon fibers [20], glass fibers [21], and carbon nanotubes [17,22] nanoparticles mainly subjected to electric field-induced orientation. Despite preliminary investigations on layered silicates orientation in polymer, the thermo-forming is the preferred technology to realize the orientation arrangement of nano filler [23][24][25][26]. The study on electric field-induced method is rarely reported [27,28], the related polymer matrixes studied in these objects were epoxy and polypropylene.…”

Section: Introductionmentioning

confidence: 99%

Electric field inducement of montmorillonite in ldpe and properties of electrical tree growing in this composite

Yang

Bai

Liu

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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The electric field-induced method is proposed to orient montmorillonite (MMT) in lowdensity polyethylene (LDPE) and improve the electrical tree resistance of LDPE. A new orientation setup for electrical inducement was designed to achieve MMT orientation in the LDPE/MMT composite. The effect of electrically induced orientation was characterized by X-ray diffraction, ultraviolet-visible spectroscopy, and scanning electron microscopy. The initiation and propagation properties of electrical trees in the LDPE/MMT composite before and after the electrically induced treatment were investigated and compared. Results indicate that the electric field contributes to the uniform dispersion of MMT in LDPE and causes MMT layers to shift in a direction parallel to the electric field. The LDPE/MMT composite after the electrically induced treatment showed higher capability for suppressing electrical trees under the powerfrequency field.

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Rheological behavior of polymer/layered silicate nanocomposites under uniaxial extensional flow

Cited by 37 publications

References 19 publications

Strategies for the preparation of polymer composites with complex alignment of the dispersed phase

Strategies for the preparation of polymer composites with complex alignment of the dispersed phase

High-density polyethylene/needle-like sepiolite clay nanocomposites: effect of functionalized polymers on the dispersion of nanofiller, melt extensional and mechanical properties

Electric field inducement of montmorillonite in ldpe and properties of electrical tree growing in this composite

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