Preparation and dynamic mechanical properties of polyurethane‐modified epoxy composites filled with functionalized fly ash particulates

Wu, Guanglei; Gu, Junfeng; Xiao, Zhao

doi:10.1002/app.26146

Cited by 57 publications

(30 citation statements)

References 58 publications

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“…The O-H group in Si coupling agent condenses with O-H group of fly ash in an aqueous environment leading to the formation of covalent bond linkage for improving the resin wettability. The peaks at 2800 cm -1 are assigned to the C-H stretch in the propyl chain and the peak at1030 cm -1 is interpreted to the Si-O-Si bonds [14] .The FTIR spectra of sodium lauryl sulphate treated fly ash particles are shown in Figure 4c. It is observed that the peaks at the range of 1000-700 cm -1 are assigned for the vibration of Si-O and Al-O bonds.…”

Section: Resultsmentioning

confidence: 99%

Surface treated fly ash filled modified epoxy composites

et al. 2015

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SbstractFly ash, an inorganic alumino silicate has been used as filler in epoxy matrix, but it reduces the mechanical properties due to its poor dispersion and interfacial bonding with the epoxy matrix. To improve its interfacial bonding with epoxy matrix, surface treatment of fly ash was done using surfactant sodium lauryl sulfate and silane coupling agent glycidoxy propyl trimethoxy silane. An attempt is also made to reduce the particle size of fly ash using high pressure pulverizer. To improve fly ash dispersion in epoxy matrix, the epoxy was modified by mixing with amine containing liquid silicone rubber (ACS). The effect of surface treated fly ash with varying filler loadings from 10 to 40% weight on the mechanical, morphological and thermal properties of modified epoxy composites was investigated. The surface treated fly ash was characterized by particle size analyzer and FTIR spectra. Morphological studies of surface treated fly ash filled modified epoxy composites indicate good dispersion of fillers in the modified epoxy matrix and improves its mechanical properties. Impact strength of the surface treated fly ash filled modified epoxy composites show more improvement than unmodified composites.

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Section: Resultsmentioning

confidence: 99%

Surface treated fly ash filled modified epoxy composites

et al. 2015

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“…2 chain extension by amine. The reason is that the N-H group and the carboxy group (C=O) of urethane has generated a spot of hydrogen bonds in our experiment, 27 which resulted in the absorption peak of N-H stretching shifted to low value. The band at 1745 cm À1 was C=O stretching of the urethane group, and the strong band at 1223-1267 cm À1 corresponded to the stretching vibrations of C=O combined with NH in all the spectra.…”

Section: Ir Spectramentioning

confidence: 97%

Crosslinked polyurethane–epoxy hybrid emulsion with core–shell structure

Wen

Ying

et al. 2009

J Coat Technol Res

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An epoxy resin was used to prepare crosslinked polyurethane hybrid emulsion through the blocked NCO prepolymer mixing process. Due to their hydrophobicity, the amine chain extender, blocked -NCO, and epoxy are located inside the emulsion particles. Thus, the crosslinking reaction occurs mostly in the interior of the particles. In this way, the crosslinking density of the resin is increased without the use of solidifying agents or heating during film formation, and the stability of the emulsions remains uninfluenced. The effects of the type of amine chain extender and the type, dosage, and addition mode of the epoxy resin were studied in terms of mechanical properties and swelling properties in water and toluene of the cast films. Additionally, the stability of the single-pack hybrid emulsion was studied. The results showed that the sample prepared with diethylene triamine had good stability, chemical resistance, and high mechanical strength. The modulus and water resistance of the films increased with the epoxy resin content, which could reach 20 wt%. The type of amine chain extender affected the stability of the emulsions significantly. The molar ratio of NH/NCO at 1:1 led to the best film performance. The optimal temperature of the chain-extension reaction was approximately 80°C. The hybrid emulsions could be stored for at least 6 months without apparent performance changes.

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“…In the glassy region, the movement of chain segments is mostly "frozen" due to tight packing, so the material is prone to store more energy; this results in a high storage modulus [41]. The storage moduli of hybrid TCE + PTFE composites are high at −60 ∘ C and decreases as the temperature increases.…”

Section: The Effect Of Fiber and Filler Loading On Storage Modulus Lmentioning

confidence: 99%

Dynamic Mechanical Analysis and Three-Body Abrasive Wear Behaviour of Thermoplastic Copolyester Elastomer Composites

Hemanth

Sekar

Pallathadka

2014

Advances in Tribology

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Various amounts of short fibers (glass and carbon) and particulate fillers like polytetrafluoroethylene (PTFE), silicon carbide (SiC), and alumina (Al 2 O 3 ) were systematically introduced into the thermoplastic copolyester elastomer (TCE) matrix for reinforcement purpose. The mechanical properties such as storage modulus, loss modulus, and Tan by dynamic mechanical analysis (DMA) and three-body abrasive wear performance on a dry sand rubber wheel abrasion tester have been investigated. For abrasive wear study, the experiments were planned according to 27 orthogonal array by considering three factors and three levels. The complex moduli for TCE hybrid composites were pushed to a higher level relative to the TCE filled PTFE composite. At lower temperatures (in the glassy region), the storage modulus increases with increase in wt.% of reinforcement (fiber + fillers) and the value is maximum for the composite with 40 wt.% reinforcement. The loss modulus and damping peaks were also found to be higher by the incorporation of SiC and Al 2 O 3 microfillers. The routine abrasive wear test results indicated that TCE filled PTFE composite exhibited better abrasion resistance. Improvements in the abrasion resistance, however, have not been achieved by short-fiber and particlaute filler reinforcements. From the Taguchi's experimental findings, optimal combination of control factors were obtained for minimum wear volume and also predictive correlations were proposed. Further, the worn surface morphology of the samples was discussed.

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Preparation and dynamic mechanical properties of polyurethane‐modified epoxy composites filled with functionalized fly ash particulates

Cited by 57 publications

References 58 publications

Surface treated fly ash filled modified epoxy composites

Surface treated fly ash filled modified epoxy composites

Crosslinked polyurethane–epoxy hybrid emulsion with core–shell structure

Dynamic Mechanical Analysis and Three-Body Abrasive Wear Behaviour of Thermoplastic Copolyester Elastomer Composites

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