The preparation of zinc silicate/ZnO particles and their use as an efficient UV absorber

Podbršček, Peter; Dražić, Goran; Anžlovar, Alojz; Orel, Zorica Crnjak

doi:10.1016/j.materresbull.2011.06.037

Cited by 15 publications

(10 citation statements)

References 30 publications

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“…Nevertheless, its application is limited not only at higher temperature due to its poor thermal stability, but also due to its relatively resistant for UV light. The combination of PMMAmatrixwith inorganic materials (i.e, metal oxides) such as CeO 2 [13], TiO 2 [14,15],ZrO 2 [16,17], ZnO [18,19] and silica [20], are resulting in new and often unique properties.Among of them,the thermal stabilityand optical properties in the UV-rays region are improved. Nowadays, the metal oxides in nanoscales,especially with PMMA polymer exhibit an excellent candidate for flame retardancey, electrical behavior, antimicrobial activity and UV-blocking.…”

Section: Introductionmentioning

confidence: 99%

High-performance of nanoparticles and their effects on the mechanical, thermal stability and UV-shielding properties of PMMA nanocomposites

et al. 2017

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T HE TARGET of this work is to choose a suitable nanoparticle for preparing a highly ultraviolet (UV)-shielding from poly (methylmethacrylate) (PMMA) nanocomposites at low concentration and to decrease the destructive effects of UV radiation. Morphologies of the synthesized nanoparticles were investigated by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM). Whereas, pure PMMA and its nanocomposites were characterized by using dynamic mechanical analysis (DMA), tensile testing, UV-visible spectra (T%), and thermogravimetric analysis (TGA). The obtained results showed a good correlation between the tensile properties, DMA and TGA analysis depending on the type of nanoparticles used in the PMMA matrix, especially in case of ZrO 2 and ZnO. Furthermore, UV-vis spectra were analyzed ranging from 200 nm to 800 nm. It showed that UV radiation is significantly blocked from 100% to 0.2 % in the UV range between 200 nm and 360 nm for pure PMMA and to 0.08 % for PMMA/CeO 2 nanocomposite and to 0.01 % for PMMA/ CeO 2 with various types of nanoparticles. After 360 nm, pure PMMA and PMMA/CeO 2 were a little bit affected by UV lights, whereas the PMMA based on different nanoparticles was not affected. This result demonstrates that these nanocomposites could be strongly candidates for the sunscreens or for several fields that related to the UV photodegradation effects.

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Section: Introductionmentioning

confidence: 99%

High-performance of nanoparticles and their effects on the mechanical, thermal stability and UV-shielding properties of PMMA nanocomposites

et al. 2017

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“…Combining the organic polymers with inorganic particles, fillers can result in materials with enhanced mechanical and other properties [31]. By reducing the size of filler the interface between the filler particles and the polymer matrix is substantially increased and therefore their impact on the properties of the composite is significantly enhanced [32,33]. Many polymer materials undergo chemical degradation when exposed to sunlight.…”

Section: Introductionmentioning

confidence: 99%

Polyol‐Mediated Synthesis of Zinc Oxide Nanorods and Nanocomposites with Poly(methyl methacrylate)

Anžlovar

Orel

Kogej

et al. 2012

Journal of Nanomaterials

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ZnO nanorods (length 30–150 nm) were synthesized in di(ethylene glycol) using Zn(CH3COO)2as a precursor andpara-toluene sulphonic acid, p-TSA, as an end-capping agent. Increasing the concentration of p-TSA above 0.1 M causes the reduction of the ZnO length. Nanocomposites with poly(methyl methacrylate) were prepared using unmodified nanorods. They enhanced the UV absorption of nanocomposites (∼98%) at low ZnO concentrations (0.05–0.1 wt.%), while visible light transparency was high. At concentrations of 1 wt.% and above, nanorods enhanced the thermal stability of nanocomposites. At low concentrations (0.05–0.1 wt.%), they increased the storage modulus of material and shiftedTgtowards higher temperatures as shown by dynamic mechanical analysis, DMA, while at higher concentrations (1.0 wt.%) this effect was deteriorated. DMA also showed that spherical ZnO particles have a more pronounced effect on the storage modulus andTgthan nanorods.

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“…Literature reports enhanced polymer UV-stability since ZnO is an excellent UV absorber, however, the absorbed energy can be transferred to the polymer chains, causing their scission. Upon UV light exposure, ZnO is excited, leading to the formation of oxygen-active (hydroperoxide) species in the presence of OH groups on the surface, which can cause scission of polymer chains [17,39]. The first change caused by the UV light is the color or gloss change [40].…”

Section: Resultsmentioning

confidence: 99%

“…Besides, ZnO influences the thermal and mechanical properties as well as the chemical and physical stability of polymer matrices [14]. ZnO is known for its UV protecting capability [15,16,17], but its impact on the catalytic degradation of polymers has been less explored [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…Here, we focus only on the composites prepared by melt processing (extrusion and injection molding). Some authors disclosed enhanced electrical properties (reduced resistivity for few orders of magnitude) [22,23,24] or UV stability [15,16,17] when large quantities of nano ZnO (30 wt% and more) were added to the polyolefin (PE or PP) matrices. Some of them reported on significantly improved antibacterial activity of PE or PP/ZnO nanocomposites [7,20,21,25].…”

Section: Introductionmentioning

confidence: 99%

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Polyolefin/ZnO Composites Prepared by Melt Processing

et al. 2019

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Composites of polyolefin matrices (HDPE and PP) were prepared by melt processing using two commercially available nano ZnO powders (Zinkoxyd aktiv and Zano 20). The mechanical and thermal properties, UV-Vis stability, and antibacterial activity of composites were studied. Tensile testing revealed that both nano ZnO types have no particular effect on the mechanical properties of HDPE composites, while some positive trends are observed for the PP-based composites, but only when Zano 20 was used as a nanofiller. Minimal changes in mechanical properties of composites are supported by an almost unaffected degree of crystallinity of polymer matrix. All polyolefin/ZnO composites exposed to artificial sunlight for 8–10 weeks show more pronounced color change than pure matrices. This effect is more evident for the HDPE than for the PP based composites. Color change also depends on the ZnO concentration and type; composites with Zano 20 show more intense color changes than those prepared with Zinkoxyd aktiv. Results of the antibacterial properties study show very high activity of polyolefin/ZnO composites against Staphylococcus aureus regardless of the ZnO surface modification, while antibacterial activity against Escherichia coli shows only the composites prepared with unmodified ZnO. This phenomenon is explained by different membrane structure of gram-positive (S. aureus) and gram-negative (E. coli) bacteria.

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The preparation of zinc silicate/ZnO particles and their use as an efficient UV absorber

Cited by 15 publications

References 30 publications

High-performance of nanoparticles and their effects on the mechanical, thermal stability and UV-shielding properties of PMMA nanocomposites

High-performance of nanoparticles and their effects on the mechanical, thermal stability and UV-shielding properties of PMMA nanocomposites

Polyol‐Mediated Synthesis of Zinc Oxide Nanorods and Nanocomposites with Poly(methyl methacrylate)

Polyolefin/ZnO Composites Prepared by Melt Processing

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