Effect of organo-smectite clays on the mechanical properties and thermal stability of EVA nanocomposites

Ryu, Hyeon-Ju; Hang, Nguyen Thu; Lee, Ji Hee; Prakash, Nunna Guru; Choi, Gun

doi:10.1016/j.clay.2020.105750

Cited by 20 publications

(7 citation statements)

References 49 publications

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“…Nowadays, polymer nanocomposites have attracted the attention of many groups in both the scientific community and industry. Several studies, indeed, have shown that incorporating very small amounts of nanoparticles into thermoplastic materials can improve properties, such as mechanical properties, [ 1 , 2 ] thermal, [ 3 , 4 ] barrier, [ 5 , 6 ] and dielectric [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Properties and on the Photo-Oxidation Behaviour of Polypropylene/Fumed Silica Nanocomposites

et al. 2021

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This work investigates the effects of very small amounts of fumed silica on the morphology and on the rheological and mechanical behaviour of polypropylene nanocomposites and on their photo-oxidation behaviour. Polypropylene nanocomposites were prepared using a twin-screw corotating extruder with 0, 1 and 2 wt/wt% of SiO2. Morphological, mechanical, thermomechanical and rheological properties were examined. It was found that the viscosity of the matrix is reduced by the presence of the silica nanoparticles, suggesting a poor adhesion between the two phases and probably some lubricating effect. On the contrary, the mechanical and, in particular, the thermomechanical properties of the matrix are considerably improved by the presence of the silica. In particular, elastic modulus and tensile strength increases remarkably, and this effect becomes more and more remarkable with an increasing temperature. As for the photo-oxidation behaviour, the presence of silica improves the photostability of the polypropylene matrix. This effect has been attributed to both the barrier to the oxygen and to the absorbance of the UV radiation from the silica nanoparticles. Finally, no significant effect of the silica nanoparticles has been put in evidence on the crystallisation behaviour of the polypropylene. As for the effect of the silica content, the difference in the properties of the two nanocomposites is relatively small and all the measured properties depend much less than linearly with its amount. This has been correlated with the reaggregation of the nanoparticles that, having a larger size, decrease the contact area between the matrix and the filler.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Properties and on the Photo-Oxidation Behaviour of Polypropylene/Fumed Silica Nanocomposites

et al. 2021

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Section: Introductionmentioning

confidence: 99%

“…It has been well reported that the incorporation of inorganic-based nanofillers such as Mt/mica/Ht, layered double hydroxide (LDH) and carbon nanotubes could enhance the overall stability of polymer composites [ 12 , 13 , 14 , 15 , 16 ]. In particular, the layered silicates such as Mt/mica/Ht have been utilized as potential additives to develop polymer-based hybrids due to their surface characteristics (a large volume ratio and surface area) in layered smectite clays [ 16 , 17 , 18 ]. Many attempts have already been made to find a correlation between various factors such as organic clay dispersion, layer charge, particle size, clay aspect ratio, and surfactant in the polymer matrix, but no clear evidence has been provided yet.…”

Section: Introductionmentioning

confidence: 99%

“…The layered arrangements (with a thickness of ~1 nm and a high aspect ratio of ~30 to 1500 nm) along with a properly exfoliated nature entails a platelet-like clay particles with a high stiffness and strength that can be homogeneously blended along the polymer chains [ 16 , 18 , 19 ]. Additionally, the hydrophilic smectite clays can easily be combined with hydrophilic polymers.…”

Section: Introductionmentioning

confidence: 99%

“…It should also be noted that a polymer nanocomposite’s characteristics rely on the processing method through homogeneous mixing of nanofillers across the polymer matrix [ 12 , 23 ]. The major preparation techniques for organo-clay nanocomposites are in situ polymerization, melt blending, and solution blending [ 4 , 16 , 24 , 25 , 26 ]. Among these, solution blending has been effective for uniformly mixing organo-clays in PP chains; therefore, the present study utilized the solution-blending method when designing the clay/PP nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Nanofillers Based on Cetyltrimethylammonium-Modified Clays in a Polypropylene Nanocomposite

et al. 2022

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Nanocomposites of hydrophobic organo-clay/polypropylene (organo-clay/PP) were efficiently developed through a solution-blending technique. For this, we utilized various smectite clays as host agents; namely, Na-montmorillonite (Mt, ~1000 nm), Na-fluorine mica (Mica, ~1500 nm), and Na-hectorite (Ht, ~60 nm) with varied sizes, layer charges, and aspect ratios. Such clays were functionalized with cetyltrimethylammonium (CTA) bromide via an intercalation technique to obtain hydrophobic organic clays. The as-made clay particles were further mixed with a PP/xylene solution; the latter was removed to obtain the final product of the CTA-clay/PP nanocomposite. An X-ray diffraction (XRD) analysis confirmed that there were no characteristic (001) diffraction peaks for CTA-Mica in the PP nanocomposites containing CTA-Mica, assuring the fact that the Mica layers could be completely exfoliated and thereby homogenously composited within the PP. On the other hand, the CTA-Mt and CTA-Ht incorporated composites had broader (001) peaks, which might have been due to the partial exfoliation of CTA-Mt and CTA-Ht in the composites. Among the three CTA-clay/PP nanocomposites, the CTA-Mica nanohybrid showed an enhanced thermal stability by ~42 °C compared to the intact host polymer matrix. We also noted that when the CTA-Mica content was ~9 mass % in the nanocomposites, the Young’s modulus was drastically maximized to 69%. Our preliminary results therefore validated that out of the three tested clay-PP nanocomposites, the CTA-Mica nanofiller served as the best one to improve both the thermal and mechanical properties of the PP nanocomposites.

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Fingerprint inspired advanced end-effector and its applications

et al. 2022

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The human fingertip consists of a fingerprint with many micro-grating structures. The main roles of the fingerprint could be divided into two purposes, namely, the enhancement of the frictional force and the effective transmittance of the biosignal. In this study, we present the fingerprint-inspired end-effector that has not only admirable frictional force but also electric conductivity. The end-effector is composed of fluorocarbon rubber, one of the famous materials to achieve high frictional force and robustness. Through various experiments, the novel performance of micro structured fluorocarbon rubber end-effector (MSFE) is characterized by comparing with a macroscale patterned sample (MPS), which has been already used in real industrial fields. Experimental results are analyzed theoretically. Furthermore, as feasible applications, we suggest two applications based on the role of the fingerprint. One is the conductive astronaut glove with high frictional force, and the other one is a non-slip pad for the next-generation glass transfer systems. Through these experiments, we successfully observe the enhanced system performance and confirm the possibility of using the MSFE as feasible applications. We believe that the MSFE could be a useful and powerful alternative as an end-effector, not only in the aerospace industry but also in display manufacturing processes.

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Effect of organo-smectite clays on the mechanical properties and thermal stability of EVA nanocomposites

Cited by 20 publications

References 49 publications

Investigation on the Properties and on the Photo-Oxidation Behaviour of Polypropylene/Fumed Silica Nanocomposites

Investigation on the Properties and on the Photo-Oxidation Behaviour of Polypropylene/Fumed Silica Nanocomposites

Effects of Nanofillers Based on Cetyltrimethylammonium-Modified Clays in a Polypropylene Nanocomposite

Fingerprint inspired advanced end-effector and its applications

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