Depth‐Dependent Indentation Microhardness Studies of Different Polymer Nanocomposites

Bhandari, Netra Lal; Lach, Ralf; Grellmann, W.; Adhikari, Rameshwar

doi:10.1002/masy.201250506

Cited by 15 publications

(11 citation statements)

References 30 publications

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“…The evaluation of these curves permits the determination of both plastic and elastic works of deformation, different hardness parameters (such as Martens hardness, Vickers hardness, etc.) and the indentation modulus E IT of the samples (Lach et al 2010& Bhandari et al 2012.…”

Section: Microindentation Testsmentioning

confidence: 99%

Synthesis and Characterization of Nanostructured Blends of Epoxy Resin and Block Copolymers

Pandit

Berkessel

Lach

et al. 2013

Nepal Journal of Science and Technology

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Polystyrene-polybutadiene block copolymers having different molecular architectures were epoxidized by using meta-chloroperoxybenzoic acid (MCPBA). Then, the blends with epoxy resin (diglycidyl ether of bisphenol-A; DGEBA) and their nanocomposites with boehmite and layered silicate nanofiller in presence of methylene dianiline (MDA) as a hardener were prepared. The epoxidized copolymers and the composites were characterized by Fourier transform infrared (FTIR) spectroscopy and microindentation technique. In this way, it was possible to tune the morphology of the nanostructured blends of the epoxy resin using the functionalized block copolymer as the template. The presence of nanostructured morphology was attested by the optical transparency of the blends as well as of the composites with nanofiller. The microhardness properties were improved by the incorporation of the nanoparticles, viz. boehmite and layered silicate.

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Section: Microindentation Testsmentioning

confidence: 99%

Synthesis and Characterization of Nanostructured Blends of Epoxy Resin and Block Copolymers

Pandit

Berkessel

Lach

et al. 2013

Nepal Journal of Science and Technology

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“…Indentation techniques are among the simplest, most reliable, and most efficient methods of testing the surface mechanical properties of thermosetting materials. (Micro)indentation testing has been employed in determining the fracture toughness as well the hardness and elastic modulus of polymeric materials such as micro- and nanostructured thermosets [48,49].…”

Section: Resultsmentioning

confidence: 99%

A New Way of Toughening of Thermoset by Dual-Cured Thermoplastic/Thermosetting Blend

Khatiwada

Gohs

Lach³

et al. 2019

Materials

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The work aims at establishing the optimum conditions for dual thermal and electron beam curing of thermosetting systems modified by styrene/butadiene (SB)-based triblock copolymers in order to develop transparent and toughened materials. The work also investigates the effects of curing procedures on the ultimate phase morphology and mechanical properties of these thermoset–SB copolymer blends. It was found that at least 46 mol% of the epoxidation degree of the SB copolymer was needed to enable the miscibility of the modified block copolymer into the epoxy resin. Hence, an electron beam curing dose of ~50 kGy was needed to ensure the formation of micro- and nanostructured transparent blends. The micro- and nanophase-separated thermosets obtained were analyzed by optical as well as scanning and transmission electron microscopy. The mechanical properties of the blends were enhanced as shown by their impact strengths, indentation, hardness, and fracture toughness analyses, whereby the toughness values were found to mainly depend on the dose. Thus, we have developed a new route for designing dual-cured toughened micro- and nanostructured transparent epoxy thermosets with enhanced fracture toughness.

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“…The loading rate of both loading and unloading was constant to be 15 mN/s. The evaluation of load (P) versus indentation depth (h) curves permitted the determination of different hardness parameters such as Martens hardness and indentation modulus (Lach et al 2010, Bhandari et al 2012.…”

Section: Microindentation Testmentioning

confidence: 99%

Nanofiller Reinforced Polyolefin Elastomer: Effect on Morphology and Mechanical Properties of Composites

Pradhan

Lach

Grellmann

et al. 2013

Nepal Journal of Science and Technology

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The effect of different types of fillers on morphology and mechanical properties of polymer nanocomposites has been investigated using ethylene-1-octene copolymer (EOC), a polyolefin based elastomer, as matrix and various nanofillers {such as multi-walled carbon nanotubes (MWCNT), layered silicate (LS) and boehmite (OS2)}. The morphological structures were studied by scanning electron microscopy (SEM) while the mechanical properties were characterized by tensile testing and microindentation hardness measurements. It has been shown that the nature of the nanofiller may have significant influence on the mechanical properties of the samples. Among the nanocomposites studied so far, the MWCNT filled samples showed the highest reinforcing effect followed by layered silicate. The least reinforcing effect was obtained for the samples filled with boehmite nanoparticles.

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Depth‐Dependent Indentation Microhardness Studies of Different Polymer Nanocomposites

Cited by 15 publications

References 30 publications

Synthesis and Characterization of Nanostructured Blends of Epoxy Resin and Block Copolymers

Synthesis and Characterization of Nanostructured Blends of Epoxy Resin and Block Copolymers

A New Way of Toughening of Thermoset by Dual-Cured Thermoplastic/Thermosetting Blend

Nanofiller Reinforced Polyolefin Elastomer: Effect on Morphology and Mechanical Properties of Composites

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