Titanium dioxide nanoparticles applied as ultraviolet radiation blocker in the polylactic acid bidegradable polymer

Mohr, Laura Cassol; Capelezzo, Ana Paula; Baretta, Carolina Riviera Duarte Maluche; Martins, Maria Ana Pignatel Marcon; Fiori, Márcio Antônio; Mello, Josiane Maria Muneron de

doi:10.1016/j.polymertesting.2019.04.014

Cited by 51 publications

(22 citation statements)

References 32 publications

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“…TiO 2 particles are used as a material absorbing UV radiation in sunlight [29,30]. Therefore, it was expected that this type of nanoparticles should provide the best protection against photodegradation.…”

Section: Impact Of Uv Aging On Fibers Thermal Propertiesmentioning

confidence: 99%

Influence of ZnO, SiO2 and TiO2 on the aging process of PLA fibers produced by electrospinning method

Kosowska

Szatkowski

2019

J Therm Anal Calorim

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The aim of this work was to study the effect of ceramics particles addition (SiO 2 , ZnO, TiO 2) on the ultraviolet (UV) aging of poly(lactic acid) nonwovens fabricated using electrospinning method. The resistance to aging is a key factor for outdoor and medical applications (UV light sterilization). Nonwovens were placed in special chamber with UV light. Changes of physicochemical properties were recorded using differential scanning calorimetry and attenuated total reflection Fouriertransform infrared spectroscopy. The fibers' morphology was studied by using scanning electron microscopy. Obtained results clearly showed that only PLA fibers with ZnO particles gained an increase in UV resistance. The paper presents a description of structural changes taking place under the influence of UV aging processes and describes the mechanisms of this process and the effect of ceramic addition on the lifetime of such materials.

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Section: Impact Of Uv Aging On Fibers Thermal Propertiesmentioning

confidence: 99%

Influence of ZnO, SiO2 and TiO2 on the aging process of PLA fibers produced by electrospinning method

Kosowska

Szatkowski

2019

J Therm Anal Calorim

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“…Traditionally, the plastics produced from petroleum derivatives have been applied extensively in the different packaging industry because of their low price, softness, lightness, wide accessibility and their favorable features such as transparency, brightness, and plasticity, However, these plastics derived from fossil fuel resources due to their very low biodegradability remained the major environmental concern [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the nanoparticles inclusion in PLA is regarded as an effective strategy to modify its properties and control the degradation behaviour in different media [17]. Several interesting properties of TiO2 such as strong antibacterial activity against diverse microorganisms (including algae, viruses, fungi, and bacteria), photocatalytic activity, high stability, good mechanical properties, non-flammable, resistance to corrosion, intense UV absorption, low cost, and nontoxicity make it beneficial for many applications [1,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Improvement Thermomechanical Properties of Polylactic Acid via Titania Nanofillers Reinforcement

Zorah¹,

Mustapa²,

Daud³

et al. 2020

ARFMTS

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Poly lactic acid (PLA) is a useful alternative to petrochemical commodity material used in food packaging, due to its low thermal stability and poor crystallization behaviour, it needs to improve its properties in namely terms of thermal and mechanical performance. Neat PLA was reinforced nanofiller TiO2 (titania) to improve its characteristics. Thus, the film of neat PLA and PLA nanocomposites were prepared using solvent casting and hot press methods. Diverse techniques characterized Asprepared films. To enhance the PLA miscibility, TiO2 nanoparticles were homogeneously dispersed in the PLA matrix to attain a low degree of agglomeration as explained by Field Emission Scanning Electron Microscopy (FESEM). Both XRD and differential scanning calorimetry (DSC) analyses of the reinforced nanocomposites disclosed an improvement in their crystallinity increased from 17.52 to 30.91. The dynamic mechanical analysis (DMA) indicated that the storage modulus was improved with increased TiO2 content, increased from 3.13 GPa to 3.26 GPa. Thermogravimetric analysis (TGA) results show that the addition of nanofiller improved thermal stability of the PLA nanocomposites was modified. On the other hand, the reinforced PLA nanocomposites with improved biodegradable behavior were shown to be the potential substitute of conventional petrochemical-based polymers widespread in the food packaging industries.

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“…16,18,19 The ozone and other gases of the atmosphere absorbs 100% of UVC radiation (not reaching the earth's surface), approximately 90% of UVB radiation and practically does not absorbs the UVA radiation. [18][19][20][21] The UVB component is the most energetic and harmful portion of UVR, act mainly on the most superficial layer of the skin (epidermis), and the UVA deeply penetrate the epidermal and dermal layers of the skin causing cellular damage mediated by reactive oxygen species (ROS). 9, [22][23][24] It is important to emphasize to consumers the necessity of sunscreens that offer broad-spectrum protection, with coverage of both UVA and UVB radiation.…”

Section: Introductionmentioning

confidence: 99%

Photostability of commercial sunscreens upon sunlight exposure

Prado

Bertges

Figueiredo³

et al. 2020

hu rev

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Introduction: The use of sunscreens is recommended to reduce skin damage and prevent skin cancer. However, evidence has shown that sunscreen can undergo degradation processes induced by ultraviolet (UV) radiation which can lead to reduction or loss of photoprotective capacity, generation of free radicals and toxic intermediates which react with skin structures generating biological damage. Objective: To evaluate the photostability of four sunscreen formulations with Sun Protection Factor (SPF) 30 added by different chemical and physical UV filters. Material and Methods: Each product was exposed to solar radiation from 10 a.m. to 15 p.m. (UV index: 6.0). The areas under the curves (AUC) of the absorbance spectrum of the formulations before and after radiation exposure were used to calculate the ratio between the AUC before and after the solar radiation (AUCI). Results: Only two formulations, which presented the AUCI higher than 0.8, were considered photostable. Despite having the same SPF 30, formulations showed different absorption spectrum in regions of UVA1, UVA2 and UVB and the photostability of the products tested varied considerably. Conclusion: The development of photostable formulations is critical because degradation products of UV filters can act as photo-oxidants. Furthermore, increased exposure to UV radiation due to the reduction of the photoprotective capacity of unstable products increases the risk of burns and skin cancer.

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Titanium dioxide nanoparticles applied as ultraviolet radiation blocker in the polylactic acid bidegradable polymer

Cited by 51 publications

References 32 publications

Influence of ZnO, SiO2 and TiO2 on the aging process of PLA fibers produced by electrospinning method

Influence of ZnO, SiO2 and TiO2 on the aging process of PLA fibers produced by electrospinning method

Improvement Thermomechanical Properties of Polylactic Acid via Titania Nanofillers Reinforcement

Photostability of commercial sunscreens upon sunlight exposure

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