Preparation and Structural Properties of Free Films from Rapeseed Oil-Based Rigid Polyurethane-Montmorillonite Nanocomposites

Gaidukov, S.; Cābulis, Uģis; Gromilova, Karina; Tupureina, Velta; Grigaloviča, Agnese

doi:10.1155/2013/834595

Cited by 15 publications

(11 citation statements)

References 31 publications

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“…The temperature T g increases by 12° from −27°C to −15°C with increasing nanotubes content in the EVA till this reaches 5%, which involves freedom restrictions in segmental motions of the polymer chains due to interaction at the interface of the polymer matrix and nanotubes. 33,34 Furthermore, the obtained raise of glass transition temperature from the CNT content indicates an increase of interphase polymer volume fraction; and, thereto, the composite becomes gradually replete with interphase.…”

Section: Resultsmentioning

confidence: 95%

Enhanced mechanical, conductivity, and dielectric characteristics of ethylene vinyl acetate copolymer composite filled with carbon nanotubes

Gaidukovs

Zukulis

Bochkov

et al. 2017

Journal of Thermoplastic Composite Materials

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We report high mechanical, dielectric, and thermal performance of carbon nanotubes (CNT) reinforced ethylene vinyl acetate (EVA) composites, fabricated using conventional melt extrusion processing. CNT have extremely high stiffness, electrical conductivity, and surface area, ensuring strong interactions with the polymer and effective reinforcement. The addition of CNT to EVA leads to an extremely high yield strength and Young’s modulus of the composites. The EVA composite produced, containing 5 wt% CNT, exhibited an almost 3-fold increase in Young’s modulus and a 2.2-fold improvement of yield strength compared to neat EVA. However, the composite maintained high deformation properties—a ductility of 1300%. Scanning electron microscopy analysis evidences the agglomeration of the CNT in the EVA/CNT composites. The EVA/CNT composites gained excellent electrostatic discharge properties—a surface resistivity in the range of 108 Ω/square. The observed thermal conductivity of the composites was increased by about 30% without losing the electrically insulating performance.

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Section: Resultsmentioning

confidence: 95%

Enhanced mechanical, conductivity, and dielectric characteristics of ethylene vinyl acetate copolymer composite filled with carbon nanotubes

Gaidukovs

Zukulis

Bochkov

et al. 2017

Journal of Thermoplastic Composite Materials

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“…Polypropylene glycol (PPG) is a polyol basically derived from the petrochemical industry [3]. Due to the high rising costs of petrochemical feedstock and the enhanced public desire for environmentally friendly green products, research into the utilization of renewable resources to manufacture rigid PU is necessary at the present time [4,5].…”

Section: Introductionmentioning

confidence: 99%

Pure Polyurethane and Castor Oil Based Polyurethane: Synthesis and Characterization

Alaa¹,

Yusoh²,

Hasany³

2015

J. Mech. Eng. Sci.

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In this study, the physico-chemical properties of high performance polyurethane synthesized from poly propylene glycol (PPG) in comparison with a combination of PPG and castor oil, is studied using the in-situ polymerization technique. The variations in properties of both types of polyurethanes are evaluated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and the thermogravimetric analysis (TGA) technique. Tensile strength properties were investigated by film tensile testing equipment. The results indicated the presence of large -CH stretching in the castor oil mixed polyurethane with a larger oxidative thermal stability over pure PPG polyurethanes. The tensile properties were found to be almost comparable in pure and mixed polymers, signifying the usage of mixed polymers in the future to overcome the environmental and economic crisis in polyurethane synthesis.

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“…A thin layer of paraffin was coated on disc surfaces to maximize technique accuracy. Based on the temperature‐dependent density of water (~0.99777 g/ml), the following equation was used to determine the density of the discs 42 :

0.0012 + \frac{M_{air}}{0.9983} \cdot \frac{D_{water} ‐ 0.0012}{M_{air} ‐ M_{water}}

…”

Section: Experimental Methodsmentioning

confidence: 99%

Synthesis, structure, and properties of polymer‐derived, metal‐reinforced boron carbide cermet composites

Dyatkin

Laskoski

Edelen

et al. 2020

Int J Applied Ceramic Tech

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We report on a novel polymer‐derived synthesis approach that yields boron carbide monoliths and metal‐reinforced B4C cermets. This single‐step approach relies on a preceramic powder blend of boron and an acetylenic resin with a high char yield. At low temperatures below 1500°C and without applied pressures, preceramic precursor reaction bond together and form nanocrystalline refractory B4C matrices. Resulting near net shape boron, carbide monoliths exhibit small crystal grain sizes, maintain chemical purity, and exhibit morphological homogeneity. We reinforce the refractory carbide with five different metals and demonstrate the influence of each on the density, hardness, oxidation stability, and electronic conductivity of resulting cermet composites. We assess the optimal synthesis and reinforcement strategies that tailor these nanostructured materials for inexpensive and high‐performing engineering applications.

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Preparation and Structural Properties of Free Films from Rapeseed Oil-Based Rigid Polyurethane-Montmorillonite Nanocomposites

Cited by 15 publications

References 31 publications

Enhanced mechanical, conductivity, and dielectric characteristics of ethylene vinyl acetate copolymer composite filled with carbon nanotubes

Enhanced mechanical, conductivity, and dielectric characteristics of ethylene vinyl acetate copolymer composite filled with carbon nanotubes

Pure Polyurethane and Castor Oil Based Polyurethane: Synthesis and Characterization

Synthesis, structure, and properties of polymer‐derived, metal‐reinforced boron carbide cermet composites

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