Preparation, chemical and mechanical properties of microcomposite materials based on Fe powder and phenol-formaldehyde resin

Strečková, M.; Sopčák, Tibor; Medvecký, Ľubomír; Búreš, Radovan; Fáberová, Mária; Baťko, I.; Briančin, Jaroslav

doi:10.1016/j.cej.2011.11.036

Cited by 32 publications

(12 citation statements)

References 39 publications

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“…2. The recorded FTIR spectrum for PFR gives evidence of the condensation reaction between phenol and formaldehyde as it has been already discussed in detail in our previous works and work by Poljansek and Krajnc [13,25]. FTIR spectrum of PFRGT demonstrates reaction between resol-type phenolic resin and GLYMO.…”

Section: Ftir and Tg Characterization Of Hybrid Resinsmentioning

confidence: 69%

“…3 that pure PFR exhibits a sharp transition at 175°C, which can be attributed to a rapid evolution of water and other volatile by-products (the solid-black line). Such a rapid crosslinking of polymer causes undesirable creation of cracks and foaming of PFR resin on the sample surface [13,17]. Contrary to this, a slower and more gradual release of water and other volatile by-products can be observed for the hybrid PFRGT and PFRB resins, which is highly demanding from technological point of view owing to a reduction of mechanical imperfections lowering the shape and dimensional stability of the prepared resins.…”

Section: Ftir and Tg Characterization Of Hybrid Resinsmentioning

confidence: 94%

“…Moreover, the shape and dimensional stability of the final composites is maintained even after the thermal treatment. Contrary to this, phenolic resin without any modification causes a shape and dimensional instability of the final samples on the account of the foaming of resin on the surface and evolution of volatile byproducts during a crosslinking process of the polymeric resin [13]. The PFRGT and PFRB resins can be therefore considered as very convenient insulating materials for a preparation of the core-shell microcomposites from the technological viewpoint.…”

Section: Morphology and Microstructurementioning

confidence: 98%

“…1(a) and (b) (see Ref. [13] for more details on chemical aspects of the relevant polymeric structure). On the other hand, two typical bridging modes as shown in Fig.…”

Section: Ftir and Tg Characterization Of Hybrid Resinsmentioning

confidence: 99%

“…The advantages of organic binders lie in the smart preparation of composites, high density of final green compacts and thermally undemanding curing process [12]. However, it has been demonstrated in our previous works that the thermosetting resins of hybrid organic-inorganic character are quite superior with respect to the pure organic binders because the chemical incorporation of appropriate inorganic additives into polymeric structure substantially improves mechanical properties of the final composites [13,14]. The chemical modification of phenolic resin by silica or boron generally improves the thermal stability, mechanical and flexural strength of the hybrid organic-inorganic coating [15,16].…”

Section: Introductionmentioning

confidence: 96%

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A comparison of soft magnetic composites designed from different ferromagnetic powders and phenolic resins

Strečková

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Section: Ftir and Tg Characterization Of Hybrid Resinsmentioning

confidence: 69%

Section: Ftir and Tg Characterization Of Hybrid Resinsmentioning

confidence: 94%

Section: Morphology and Microstructurementioning

confidence: 98%

“…1(a) and (b) (see Ref. [13] for more details on chemical aspects of the relevant polymeric structure). On the other hand, two typical bridging modes as shown in Fig.…”

Section: Ftir and Tg Characterization Of Hybrid Resinsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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A comparison of soft magnetic composites designed from different ferromagnetic powders and phenolic resins

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A novel polyurethane prepolymer as toughening agent: Preparation, characterization, and its influence on mechanical and flame retardant properties of phenolic foam

Yang

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et al. 2012

J of Applied Polymer Sci

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A novel phosphorus-and silicon-containing polyurethane prepolymer (PSPUP) was synthesized by the chemical reaction of phenyl dichlorophosphate with hydroxy-terminated polydimethylsiloxane (HTPDMS) and subsequently with toluene-2,4-diisocyanate. The structure of PSPUP was confirmed by Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance. Afterward, a series of phenolic foams (PF) with different loadings of PSPUP toughening agent were prepared. The apparent density and scanning electron microscopy results showed that the addition of PSPUP can increase the apparent density of phenolic foam. The compressive, impact and friability test results showed that the incorporation of PSPUP into PF dramatically improved the compressive strength, impact strength, and reduced the pulverization ratio, indicating the excellent toughening effect of PSPUP. The limiting oxygen index of PSPUP modified phenolic foams remained a high value and the UL-94 results showed all samples can pass V0 rating, indicating the modified foams still had good flame retardance. The thermal properties of the foams were investigated by thermogravimetric analysis under air atmosphere. Moreover, the thermal degradation behaviors of the PF and PSPUP/PF were investigated by real-time Fourier transform infrared spectra.

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A B3LYP and MP2(full) theoretical investigation on the cooperativity effect between hydrogen-bonding and cation-molecule interactions and thermodynamic property in the 1: 2 (Na+: N-(Hydroxymethyl)acetamide) ternary complex

Feng

Shi

et al. 2014

J Mol Model

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The cooperativity effects between the O/N-H∙∙∙O hydrogen-bonding and Na⁺∙∙∙O cation-molecule interactions in the 1: 2 (Na⁺: N-(Hydroxymethyl)acetamide) systems were investigated at the B3LYP/6-311++G**, MP2(full)/6-311++G** and MP2(full)/aug-cc-pvtz levels. The thermodynamic cooperativity calculations were also carried out for two pathways of the ternary-complex formation. The result shows that, in most ternary complexes, the O/N-H∙∙∙O and Na⁺∙∙∙O interactions are weakened in comparison with those in binary systems, leading to the anti-cooperativity effects, in particular in the complexes in which only the Na⁺∙∙∙O interactions exist. Shifts of electron density confirm the existence of anti-cooperativity. The increase of favorable enthalpic contribution leads to the positive cooperativity effect with negative ΔG(coop.) on forming the ternary complex by initial N-(Hydroxymethyl)acetamide dimer followed by addition of Na⁺. In forming the ternary complex by Na⁺∙∙∙N-(Hydroxymethyl)acetamide with the second N-(Hydroxymethyl)acetamide unit, the large unfavorable entropy change leads to the negative cooperativity effect with positive ΔG(coop.). The ternary complex is more easily formed by the pathway in which Na⁺ binds to N-(Hydroxymethyl)acetamide dimer.

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Preparation, chemical and mechanical properties of microcomposite materials based on Fe powder and phenol-formaldehyde resin

Cited by 32 publications

References 39 publications

A comparison of soft magnetic composites designed from different ferromagnetic powders and phenolic resins

A comparison of soft magnetic composites designed from different ferromagnetic powders and phenolic resins

A novel polyurethane prepolymer as toughening agent: Preparation, characterization, and its influence on mechanical and flame retardant properties of phenolic foam

A B3LYP and MP2(full) theoretical investigation on the cooperativity effect between hydrogen-bonding and cation-molecule interactions and thermodynamic property in the 1: 2 (Na+: N-(Hydroxymethyl)acetamide) ternary complex

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