Impact of titanium and silica/titanium fumed oxide nanofillers on the elastic properties and thermal decomposition of a polyester resin

Gorelov, B. M.; Gorb, Alla; Korotchenkov, О. A.; Nadtochiy, Andriy; Polovina, Oleksiy; Sigareva, Nadia

doi:10.1002/app.42010

Cited by 10 publications

(10 citation statements)

References 49 publications

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“…The reduction in the thermal stability of composites is caused with an appearance of unbound fragments of polymer chains and crosslinks in the polymer structure. It is known [30] that the destruction of unbound or unfasten moieties begins at lower temperatures than the temperature of thermal decomposition for a defect-free polymer structure. Hence a decrease in the thermal stability of composites is The appearance of unbound atomic groups and polymer structure disturbances apparently leads to diminish in the energy of intra-atomic bonds in unbound moieties and polymeric atomic groups located near polymer structure violations.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Influence of cellulose particles on chemical resistance, mechanical and thermal properties of epoxy composites

2020

Biophysical Bulletin

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Background: The technological developments for nanocellulose production from cheaper plant materials compared to wood, in particular, agricultural waste is an urgent task of nanobiophysics. The discovery of possibility of expanding the functional characteristics of materials in compositions with modified cellulose particles essentially stimulated the interest of researchers in cellulose composites. Surface modification of cellulose particles by functional materials, such as dyes, metal oxides, silicon, allows applying composites with modified cellulose in various areas of modern industry. A significant improvement in the operational performances of functionalized cellulose particles can be achieved by using them as filler in polymers. Epoxy resin compositions with modified and unmodified cellulose particles, studied in present work, are an example of hybrid biosystem. The interfacial interaction of filler particles with the epoxy matrix, their concentration and dispersion can change the physical and chemical properties of the biopolymer and the functional parameters of biocomposites. Studying the influence of external fields on the physical and chemical properties of epoxy resin-based biosystems and their influence on operational parameters seems to be an urgent problem of advanced and sustained materials science. Objectives: The purpose of this work was to develop an effective nanocellulose synthesis from plant materials and surface functionalization of micro- and nanocellulose particles with clathrochelate iron (ΙΙ) dye as well obtaining biocompositions of epoxy resin with functionalized and non-functionalized micro- and nanocellulose, and to explore of the morphology, chemical resistance, mechanical and thermal properties of epoxy composites with cellulose micro and nanoparticles. Materials and methods: The studying objects were the composites of epoxy resin Eposir-7120 with a polyethylene polyamine “PEPA” hardener in a ratio of 6.2:1 and 10% cellulose micro and nanoparticles. The microcellulose obtained from wood has been a commercial product. Nanocellulose has been synthesized from organosolv cellulose obtained from Miscanthus x giganteus stalks. Surface modification of micro- and nanocellulose was performed using the clathrochelate iron (ΙΙ) dye. The specific surface area of cellulose particles was determined using low-temperature nitrogen adsorption-desorption according to the Brunauer-Emmett-Teller method. Mechanical parameters were determined using universal Shopper and UMM-10 machines. Thermal analysis was performed using Q1500 analyzer. Swelling was determined by the gravimetric method. Results: Elastic modulus E, compressive strength σ and thermogravimetric parameters were determined. It was shown that in composites with micro and nanocellulose the E rises in 7.0–12.2% while the σ increases in 9.1% for composites with cellulose micro particles. The loading resin with nanocellulose and modified cellulose microparticles no affects the σ value of composites. The thermal stability of epoxy polymer (310°C) reduces after loading with micro and nanocellulose to 290 and 300°C, respectively. Chemical resistance of composites with both celluloses to 20% nitric acid reduces. In neutral medium swelling characterizes by rapid sorption to saturation of 15–20% acetone in 36 hours. Conclusions: Thus, the synthesis method of nanocellulose from plant materials and functionalization of its surface with clathrochelate iron (ΙΙ) were developed. Light response of dye was detected in visible spectral range. Epoxy resin composites with 10% micro and nanocellulose were obtained. The filling effect with micro- and nanocellulose at elastic modulus, compressive strength, and thermal stability of epoxycomposites was studied. The swelling processes run similarly in composites with cellulose micro and nanoparticles.

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Section: Thermal Propertiesmentioning

confidence: 99%

Influence of cellulose particles on chemical resistance, mechanical and thermal properties of epoxy composites

2020

Biophysical Bulletin

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“…Further details concerning for different behavior of TiO 2 and STO nanoparticles in the polyester resin have been extracted from studying mechanical properties, a thermal desorption process can be found elsewhere [85].…”

Section: Tio 2 -Sto Controversymentioning

confidence: 99%

“…Therefore, we make first careful steps to unveil the issue. An impact of both TiO 2 and STO nanoparticles on mechanical, thermal stability and dielectric properties of the unsaturated polyester resin has been experimentally studied by in our recent publication [85,86].…”

Section: Remarks On Structure-property Relations Of the Nanocompositesmentioning

confidence: 99%

Nonlinear Loading Effects in Oxide-filled Polyester Nanocomposites Observed by IR-spectroscopy and Lifetime Positron Spectroscopy

Gorelov¹,

Polovina²,

Gorb³

et al. 2018

ujms

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Impact of nanosized oxide particles of titania (rutile) (TiO 2) and silica-titania fumed compound on physical properties related to inner structure of a styrene-cross-linked polyester resin have been experimentally studied. The IR-spectroscopy and the positron annihilation lifetime spectroscopy (PAL) were used to study the electronic polarizability of interatomic bonds and the positron annihilation processes with increasing the filler loading. All the nanocomposites show unmonotonous variations in the IR-absorption lines and the positron annihilation parameters. Three lifetime components, namely τ 1 , τ 2 , and τ 3 with intensities I 1 , I 2 , and I 3 have been determined. The lifetime loading dependences exhibit non-monotonous lowering within the low loading range (C m ≤ 5%) with the minima values at C m ∼ 1.5 % for the unfilled resin and the nanocomposites. The free-volume portion f v (in %) in a polymer matrix decreases droningly for the nanocomposites with STO-particles upon loading while for the TiO 2-nanocomposites it increases non-monotonously. The parameters describing the supramolecular structure of the nanocomposites have been calculated using the fractal approach. Some correlations between loading-dependent PAL-properties and underlying alterations in the resin's supramolecular structure have been discussed.

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“…Fire-retardant additives, although they usually facilitate decomposition of the polyesters at lower temperature, also usually promote charring and therefore suppress combustion [2]. In doing so, however, the thermal stability and mechanical properties are generally compromised [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Characterization of flame-retardant performance of polyester/flame-retardant viscose blended yarn

Zhao

Gao

et al. 2018

Journal of Industrial Textiles

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In this paper, a flame-retardant blend yarn was designed with flame-retardant viscose fiber and polyester. Flame-retardant viscose fiber was blended with polyester by core-spun method. Polyester was set as a core and the flame-retardant viscose fiber was set as a sheath to change the flame retardancy and disadvantage of moisture permeability. After the flame-retardant viscose fiber was spun into roving, polyester was added in spun yarn. The core yarn samples with different ratios were prepared by adjusting the amount of flame-retardant viscose fiber. The flame retardancy of core-spun yarn was evaluated by limiting oxygen index, scanning electron microscope, thermogravimetric analysis, and thermogravimetric/Fourier transform infrared techniques. Limiting oxygen index of the yarn with 50% flame-retardant viscose fiber and 50% polyester was 27.6% and just decreased slightly to 27.1% after 30 washing cycles. Polyester begins to melt from inside core-spun yarn after heating and the molten polyester flows to outer layer of yarns by the diversion effect of higher temperature. Then it was carbonized by the polymetaphosphate which was generated by the flame-retardant viscose fiber. In thermal processes, the major product of thermal decomposition was CO2.

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Impact of titanium and silica/titanium fumed oxide nanofillers on the elastic properties and thermal decomposition of a polyester resin

Cited by 10 publications

References 49 publications

Influence of cellulose particles on chemical resistance, mechanical and thermal properties of epoxy composites

Influence of cellulose particles on chemical resistance, mechanical and thermal properties of epoxy composites

Nonlinear Loading Effects in Oxide-filled Polyester Nanocomposites Observed by IR-spectroscopy and Lifetime Positron Spectroscopy

Characterization of flame-retardant performance of polyester/flame-retardant viscose blended yarn

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