Surface Modification of Polymer-Clay Nanocomposites by Excimer Laser Ablation

2011 ◽  
Author(s):  
I-Ta Chang ◽  
Erol Sancaktar
Keyword(s):  
Structure Formation ◽  
Excimer Laser ◽  
Surface Structures ◽  
Clay Nanocomposites ◽  
Nano Structure ◽  
Clay Nanoparticles ◽  
Dispersion State ◽  
Molded Parts ◽  
Injection Molded ◽  
Krf Excimer Laser

This paper investigates the effects of nanoclay (Organically Modified Montmorillonite -OMMT) dispersion state and morphology of nanocomposites on laser induced surface micro/nano structure formation and modification of Polystyrene-Clay Nanocomposites at various OMMT concentrations. Injection molded sample surfaces were irradiated by a 248 nm KrF excimer laser in air. Scanning electron microscopy, atomic force microscopy and Fourier Transform Infrared (FTIR) spectroscopy with attenuated total reflectance accessory were utilized to analyze the ablated surface. Results show that, in general, better dispersion of OMMT leads to less continuous surface structures and more pronounced carbonyl regions on FTIR spectra. Clay nanoparticles are exposed on ablated surfaces and affect surface structure formation after irradiation by laser. A mechanism for the formation of excimer laser induced surface structures on injection molded parts is thus proposed.

Evaluation of Processing Effects on Polystyrene/Clay Nanocomposites Using an Excimer Laser

2007 ◽  
Author(s):  
I-Ta Chang ◽  
Erol Sancaktar
Keyword(s):  
Laser Ablation ◽  
Mass Loss ◽  
Excimer Laser ◽  
Clay Nanocomposites ◽  
Evaluation Tool ◽  
Clay Particles ◽  
Reinforced Polymer ◽  
Excimer Laser Irradiation ◽  
Injection Molded ◽  
Krf Excimer Laser

Polystyrene (PS)-Organically modified montmorillonite (OMMT) nanocomposites processed by injection molding were investigated for the effects of different OMMT concentration and melt-blending conditions using a KrF excimer laser operating at 248 nm wavelength. Results indicate that PS-OMMT nanocomposites show improved resistance to excimer laser irradiation, as revealed by reduced mass loss due to laser ablation at their surfaces, when the OMMT concentration is below 2 wt%. Further increases in OMMT wt%, above the 2 wt% value, resulted in increased mass loss due to laser ablation, when compared with ablation of the neat PS material. Our experimental results also revealed that the dispersion (exfoliation) state of OMMT plays an important role in excimer laser ablation behavior of PS-OMMT nanocomposites. This result indicates the possibility for using the excimer laser as an evaluation tool in assessing the degree of exfoliation in clay reinforced polymer nanocomposites, including the assessment of spatial distribution of clay particles in injection molded nanocomposite articles, as illustrated in this work.

Clay Dispersion Effects on Excimer Laser Ablation of Polymer-Clay Nanocomposites

2011 ◽  
Author(s):  
I-Ta Chang ◽  
Erol Sancaktar
Keyword(s):  
Weight Loss ◽  
Laser Ablation ◽  
Absorption Coefficient ◽  
Excimer Laser ◽  
Threshold Fluence ◽  
Effective Absorption Coefficient ◽  
Excimer Laser Ablation ◽  
Air Atmosphere ◽  
Dispersion State ◽  
Krf Excimer Laser

The ablation behavior of Polystyrene-Organically Modified Montmorillonite (OMMT) nanocomposites was evaluated by measuring the weight loss induced by KrF excimer laser irradiation of the nanocomposite specimens under air atmosphere. The characteristic values of ablation, ablation threshold fluence and effective absorption coefficient for polystyrene and its naonocomposites were calculated based on the weight loss data. The effects of morphology due to spatial variation in injection molded samples are also discussed in this paper. Results demonstrate that both the dispersion state and the concentration of clay play important roles in excimer laser ablation. The sensitivity of threshold fluence and absorption coefficient to dispersion state of OMMT depends on the clay concentration.

scholarly journals Preparation of periodic surface structures on doped poly(methyl metacrylate) films by irradiation with KrF excimer laser

2014 ◽  
Vol 9 (1) ◽  
pp. 591 ◽  
Author(s):  
Yevgeniya Kalachyova ◽  
Oleksiy Lyutakov ◽  
Petr Slepicka ◽  
Roman Elashnikov ◽  
Vaclav Svorcik
Keyword(s):  
Excimer Laser ◽  
Surface Structures ◽  
Periodic Surface ◽  
Methyl Metacrylate ◽  
Krf Excimer Laser

Pressure-Controlled Wavelength Stabilization of a KrF Excimer Laser with Narrowed Bandwidth

1989 ◽  
Vol 28 (Part 1, No. 11) ◽  
pp. 2354-2356
Author(s):  
Yasuhiro Shimada ◽  
Koichi Wani ◽  
Yoshiro Ogata
Keyword(s):  
Excimer Laser ◽  
Wavelength Stabilization ◽  
Krf Excimer Laser ◽  
Pressure Controlled

scholarly journals Oxide-based catalysis: tailoring surface structures via organic ligands and related interfacial charge carrier for environmental remediation

RSC Advances ◽  
2021 ◽  
Vol 11 (31) ◽  
pp. 19059-19069
Author(s):  
S. Harish ◽  
S. Athithya ◽  
V. Shivani ◽  
S. Ponnusamy ◽  
M. Shimomura ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Structure Formation ◽  
Environmental Remediation ◽  
Organic Ligands ◽  
Surface Structures ◽  
Hierarchical Nanostructures ◽  
Amine Ligands ◽  
Interfacial Charge ◽  
Photocatalytic Applications

Hierarchical nanostructures of ZnO/CuO and the effects of amine ligands on their structure, formation and photocatalytic applications were investigated.

A Study on the Birefringence Measurement in Injection Molded Parts Using Two Different Laser Sources and R-G-B Separation of White Light

2006 ◽  
Vol 326-328 ◽  
pp. 187-190
Author(s):  
Jong Sun Kim ◽  
Chul Jin Hwang ◽  
Kyung Hwan Yoon
Keyword(s):  
White Light ◽  
Low Cost ◽  
Main Idea ◽  
Injection Molding Process ◽  
Molding Process ◽  
Laser Method ◽  
High Productivity ◽  
Molded Parts ◽  
Injection Molded ◽  
Plastic Parts

Recently, injection molded plastic optical products are widely used in many fields, because injection molding process has advantages of low cost and high productivity. However, there remains residual birefringence and residual stresses originated from flow history and differential cooling. The present study focused on developing a technique to measure the birefringence in transparent injection-molded optical plastic parts using two methods as follows: (i) the two colored laser method, (ii) the R-G-B separation method of white light. The main idea of both methods came from the fact that more information can be obtained from the distribution of retardation caused by different wavelengths. The comparison between two methods is demonstrated for the same sample of which retardation is up to 850 nm.

scholarly journals Silane-Functionalized Sheep Wool Fibers from Dairy Industry Waste for the Development of Plasticized PLA Composites with Maleinized Linseed Oil for Injection-Molded Parts

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2523
Author(s):  
Franciszek Pawlak ◽  
Miguel Aldas ◽  
Francisco Parres ◽  
Juan López-Martínez ◽  
Marina Patricia Arrieta
Keyword(s):  
Linseed Oil ◽  
Microstructural Analysis ◽  
Dairy Industry ◽  
Poly Lactic Acid ◽  
Industry Waste ◽  
Wool Fibers ◽  
Molded Parts ◽  
Silane Modification ◽  
Injection Molded ◽  
Sheep Wool

Poly(lactic acid) (PLA) was plasticized with maleinized linseed oil (MLO) and further reinforced with sheep wool fibers recovered from the dairy industry. The wool fibers were firstly functionalized with 1 and 2.5 phr of tris(2-methoxyethoxy)(vinyl) (TVS) silane coupling agent and were further used in 1, 5, and 10 phr to reinforce the PLA/MLO matrix. Then, the composite materials were processed by extrusion, followed by injection-molding processes. The mechanical, thermal, microstructural, and surface properties were assessed. While the addition of untreated wool fibers to the plasticized PLA/MLO matrix caused a general decrease in the mechanical properties, the TVS treatment was able to slightly compensate for such mechanical losses. Additionally, a shift in cold crystallization and a decrease in the degree of crystallization were observed due to the fiber silane modification. The microstructural analysis confirmed enhanced interaction between silane-modified fibers and the polymeric matrix. The inclusion of the fiber into the PLA/MLO matrix made the obtained material more hydrophobic, while the yellowish color of the material increased with the fiber content.

scholarly journals Development of a novel color inhomogeneity test method for injection molded parts

2014 ◽  
Vol 37 ◽  
pp. 112-116 ◽  
Author(s):  
L. Zsíros ◽  
A. Suplicz ◽  
G. Romhány ◽  
T. Tábi ◽  
J.G. Kovács
Keyword(s):  
Test Method ◽  
Molded Parts ◽  
Injection Molded
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