Nanoscale mechanical properties of polymers irradiated by UV

Nowicki, Marek; Richter, Asta; Wolf, B.; Kaczmarek, Halina

doi:10.1016/s0032-3861(03)00729-8

Cited by 109 publications

(78 citation statements)

References 21 publications

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“…The results indicate that photocrosslinking is very efficient at PAA surface. Similar behavior of PAA has been published by Nowicki et al [31]. As stated in this work, both nanohardness and elastic indentation modulus in PAA increase by a factor about 1.5 after 8 h UV irradiation due to polymer photocrosslinking.…”

Section: X-ray Diffraction Analysis Of Paa/ag Nanocompositessupporting

confidence: 91%

Effect of stabilizer type on the physicochemical properties of poly(acrylic acid)/silver nanocomposites for biomedical applications

Kaczmarek

Metzler

Węgrzynowska-Drzymalska

2016

Polym. Bull.

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Poly(acrylic acid), PAA, has been mixed in solution with silver nanoparticles, obtained by chemical reduction of silver nitrate. Two different sulfurcontaining organic compounds have been used as stabilizers of Ag nanoparticles: mercaptosuccinic acid (MSA) and 3-mercaptopropionic acid (MPA). The formation of Ag nanoparticles has been monitored by UV-Vis spectroscopy. The morphology and composition of obtained nanomaterials has been studied by electron microscopy techniques (SEM/EDX and HR-TEM). Nanomechanical properties of nanocomposites (adhesion and nanohardness) have been investigated by Atomic Force Microscopy (AFM). Thermal stability has been determined using thermogravimetric analysis. The exposure of specimens to UV radiation allowed to observe the changes in the nanoparticle structure and to estimate nanocomposite photostability. MSA has proved to be a better stabilizer of Ag nanoparticles immediately after the synthesis, when MPA provides better storage stability. MPA has allowed for the creation of nanoparticles using mixed reduction (chemical/photochemical) of AgNO 3 . It has been found that the nanocomposite materials are stable for 12 months of storage in solution and in solid form.

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Section: X-ray Diffraction Analysis Of Paa/ag Nanocompositessupporting

confidence: 91%

Effect of stabilizer type on the physicochemical properties of poly(acrylic acid)/silver nanocomposites for biomedical applications

Kaczmarek

Metzler

Węgrzynowska-Drzymalska

2016

Polym. Bull.

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“…The former reaction leads to a significant shortening of chain length which may cause the deterioration of mechanical properties and also increasing the crystallinity due to increased mobility of polymer chains after degradation. An opposing reaction is photo-crosslinking, which is thought to be the cause of the increase of Young's modulus and decrease of the crystallinity 22,23 . DSC measurements were used to determine the change of the crystallinity with UV radiation.…”

Section: Mechanical Properties Of Pp Nano-composites After Uv Radiationmentioning

confidence: 99%

Photocatalytic degradation of polypropylene/TiO2 nano-composites

et al. 2014

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In this research, we have investigated the photocatalytic degradation of carbon-coated TiO 2 nanoparticles in polypropylene-based nano-composites. For this purpose, polypropylene-based nano-composites were prepared using carbon-coated TiO 2 nanoparticles and commercially available TiO 2 nanoparticles (Degussa, P25). Our results from SEM, FTIR, and tensile tests showed that the photocatalytic property of TiO 2 causes chain scission reactions, crosslinking and consequently photocatalytic degradation of polypropylene that affects the mechanical properties of exposed nano-composites. We have observed that with greater carbon content of the TiO 2 nano-powders, there is less photocatalytic degradation.

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“…The impact of the UV light [3][4][5][6][7], simulated solar radiation [8], high voltage [9], complex environmental conditions [10] increased temperature [11,12] and others [13][14][15] was investigated, allowing to observe the topography changes indicating the intensity of the materials response. Also the changes of the mechanical properties at nanoscale were reported as the result of the environmental conditions [3,7] or local, nanoscale wear [16]. It should be emphasized, that the issue of the mechanical non-homogeneity must be also carefully analyzed, in particular while the sample is used as the stiffness/ Young modulus reference material [17] or the adhesion phenomena is investigated [18].…”

Section: Introductionmentioning

confidence: 99%

High Accuracy and Sensitivity Method of the Observation of the Surface’s Morphology Changes by Means of Atomic Force Microscopy with Cyclic, Precise Sample Positioning

Sikora¹

2017

NSNM

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Abstract:The submicron changes of the morphological properties of the surface can provide one of the earliest indications of the degradation of the material due exposition to a certain media. Atomic force microscopy, as the tool delivering 3D quantitative imaging of the surface with ultimate resolution, is successfully utilized in the detection of the materials degradation. Yet, a several issues such as the materials non-homogeneity and the presence of the morphological artifacts must be taken into account in terms of the reliability of obtained data, while their presence in the scanned area may cause a significant deviation of the measurement outcome from the values being representative to the condition of the investigated material. In this paper the approach based on the precise sample positioning at each stage of the verification of the deterioration progress is presented. This novel method allows to acquire the information with unique sensitivity and high degree of confidence. Moreover, the observation of the morphology changes at several spots with high receptivity enables determination of the homogeneity of the deterioration, which may play essential role in case of investigation of behavior of complex materials (containing additives or fillers), in particular nanomaterials. A set of experimental results acquired on the polycarbonate and polyethylene samples is here presented, revealing the efficiency of presented approach and its advantages over the commonly applied methods.

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Nanoscale mechanical properties of polymers irradiated by UV

Cited by 109 publications

References 21 publications

Effect of stabilizer type on the physicochemical properties of poly(acrylic acid)/silver nanocomposites for biomedical applications

Effect of stabilizer type on the physicochemical properties of poly(acrylic acid)/silver nanocomposites for biomedical applications

Photocatalytic degradation of polypropylene/TiO2 nano-composites

High Accuracy and Sensitivity Method of the Observation of the Surface’s Morphology Changes by Means of Atomic Force Microscopy with Cyclic, Precise Sample Positioning

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