High-density polyethylene/halloysite nanocomposites: morphology and rheological behaviour under extensional and shear flow

Singh, Vishwa Pratap; Vimal, K. K.; Kapur, G. S.; Sharma, Sandeep; Choudhary, Veena

doi:10.1007/s10965-016-0937-1

Cited by 48 publications

(42 citation statements)

References 57 publications

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“…22,58 In our recent studies on HDPE/HNTs nanocomposites it was observed that incorporation of HNTs into HDPE did not change the tensile and exural properties of HDPE. 5 This can be explained on the basis of aspect ratio of llers. Sepiolite has very high aspect ratio ) as compared to HNTs .…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…1 HDPE based nanocomposites with various nanoparticles like nanoclays such as montmorillonite (MMT), carbon nanotubes (CNTs), halloysite nanotubes (HNTs) and metal oxide nanoparticles have been widely reported in the literature. [2][3][4][5] The properties of nanocomposites can be greatly affected by the dispersion of nanoparticles in the polymer matrix. 6 Generally, better dispersion leads to better properties of the nal nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Mechanical Propertiesmentioning

confidence: 99%

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 effects of HNT loading and compatibilizer amount on morphology and rheological properties were investigated. Rheological studies indicate that both the complex viscosity and storage modulus in oscillatory rheometry are the highest for nanocomposites prepared using 10 wt% HNTs, and reduced slightly after incorporating a compatibilizer .…”

Section: Introductionmentioning

confidence: 99%

“…It is known that rheology can potentially offer a method to assess the state of dispersion of nanocomposites directly in the melt state. Using rheology as a screening tool offers an integrated picture of the composite material, with contributions stemming from the effects of particles on the local deformation rate of the polymer, the effect of particulate orientation, exfoliation, and the interaction between the particles . The objective of this work is to extend the investigation of polymer nanocomposite rheology to the case of PP/HNT composites prepared by water injection, to validate the application of the K‐BKZ constitutive model on the predictability of the transient shear behaviors, and to determine the unique material parameters of PP/HNT composites.…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic behavior and constitutive modeling of PP/HNT composites prepared by water‐assisted extrusion

Huang

2019

Polymer Engineering & Sci

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Poly(propylene) (PP) nanocomposites containing 5, 10, and 15 wt% unmodified halloysite nanotubes (HNTs) were prepared using extrusion with and without water injection. Scanning electron microscopy micrographs show that HNT aggregates prepared by water injection are smaller than those prepared by conventional melt extrusion (without water injection). The nanocomposites prepared by water injection exhibit higher storage modulus (G′) and complex viscosity (η*) values than those by conventional melt extrusion. Stress relaxation results indicate that the interaction between HNTs and PP matrix at low concentration (5 wt%) is stronger than its non‐water injection counterpart. Subsequently, for 5 wt% HNT sample, the transient viscosity is simulated numerically using the Kaye–Bernstein–Kearsley–Zapas (K‐BKZ) integral constitutive equation along with experimentally determined damping functions. It is found that the samples prepared by water injection exhibit a more obvious overshoot behavior than conventional samples and the Papanastasiou‐Scriven‐Macosko (PSM) model can predict the transient viscosity of the samples more accurately than Wagner model. Further, the relationship between the dispersion of HNTs and the damping factors in the constitutive models is discussed. The results of this investigation would improve the theoretical understanding of possible polymer–filler interaction during shear flow. POLYM. ENG. SCI., 59:1585–1592 2019. © 2019 Society of Plastics Engineers

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“…However, few investigations have been carried out on the melt extensional properties (melt strength, drawability and extensional viscosity) of polymer/HNTs nanocomposites, especially the mechanism analysis regarding the effect of HNTs microstructure on them. The research by Choudhary and co‐workers demonstrated that melt extensional properties of high‐density polyethylene (HDPE)/HNTs nanocomposites prepared by melt mixing exhibit a slight increase with increasing HNTs content up to 5 wt% and then a decrease as increasing HNTs content to 10 wt%, and the extensional viscosity is significantly increased as adding HDPE‐grafted maleic anhydride. The research for PA6/HNTs nanocomposites by Handge et al showed that their melt strength is obviously improved with increasing HNTs content, and the drawability at higher HNTs contents is lower than that of neat PA6.…”

Section: Introductionmentioning

confidence: 99%

Structural interpretations on tensile fracture mechanism and elongational rheology of poly(vinylidene fluoride)/halloysite nanotubes nanocomposites

Huang

2018

Polymer Engineering & Sci

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Halloysite nanotubes (HNTs)‐filled poly(vinylidene fluoride) (PVDF) nanocomposites were fabricated using continuous mixing extrusion with and without water injection. The HNTs dispersion state was qualitatively and quantitatively analyzed by using transmission electron microscopy and the Halpin‐Tsai equation, suggesting better HNTs dispersion in the nanocomposites fabricated with water injection. To grasp the relationship between the structure and properties, the effect of the HNTs dispersion on the tensile fracture mechanism and melt elongational rheology of the nanocomposites was investigated. It was deduced from morphological observations on the fractured surfaces that for the nanocomposites fabricated without and with water injection, cracks initially formed at the vicinity of HNTs aggregates and the thinner brittle fracture edge region, respectively. This was attributed to the important roles of the PVDF crystallization behavior and HNTs dispersion on the formation of the voids, wedges and ridges, which are the origins for forming cracks and easily formed at region with more HNTs aggregates or lower crystallinity. The nanocomposites fabricated with water injection exhibited lower elongational viscosities and 17–60% increments for the draw ratios at break than those fabricated without water injection, due to better HNTs dispersion induced by injected water. POLYM. ENG. SCI., 59:773–780, 2019. © 2018 Society of Plastics Engineers

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High-density polyethylene/halloysite nanocomposites: morphology and rheological behaviour under extensional and shear flow

Cited by 48 publications

References 57 publications

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

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

Viscoelastic behavior and constitutive modeling of PP/HNT composites prepared by water‐assisted extrusion

Structural interpretations on tensile fracture mechanism and elongational rheology of poly(vinylidene fluoride)/halloysite nanotubes nanocomposites

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