Research on the PDMS Surface Modification Technique

2013 ◽  
Vol 562-565 ◽  
pp. 131-135
Author(s):  
Li Tian ◽  
Lei Wu ◽  
Wei Wang ◽  
Xiao Wei Liu
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Polymer Materials ◽  
Oxygen Plasma Treatment ◽  
Pdms Surface ◽  
Coating Technique ◽  
Long Time ◽  
Aging Property ◽  
Modification Technique ◽  
Hydrophilic Character

UV radiation, oxygen plasma treatment and dynamical coating technique were the three main modification techniques to be widely applied in the surface modification of polymer materials. This paper presented the experiment results of PDMS surface modification with these three techniques. The contact angle was measured to test the modification effect, also the further verification testing of aging property after a long time storage were carried out. Of all the testing results, the dynamical coating technique, 10 layers 0.02% PDDA and PSS (V/V) alternatively adhesion on the PDMS surface, made the contact angle lowed to the 21°, and even after 15 days, it still kept as the 61°and exhibited the better hydrophilic character.

Analysis on surface modification of orthodontic power chain by nanoimprinting process

2014 ◽  
Vol 34 (3) ◽  
pp. 209-217
Author(s):  
Hsing-Chung Cheng ◽  
Wan-Tin Lin ◽  
Yung-Kang Shen ◽  
Yen-Hsiang Wang
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Surface Treatment ◽  
Water Absorption ◽  
Process Parameters ◽  
Pure Aluminum ◽  
Polymer Materials ◽  
Hydrophobic Properties ◽  
Water Absorbance

Abstract The traditional orthodontic power chain, usually made of polymer materials, exists some drawbacks, such as the reduction of elasticity due to swell after absorbing water and surface discoloration resulting from the patient’s diet, food, or beverage colors leading to poor appearance. The main purpose of this study was to develop surface modification on orthodontic power chain and to realize the properties change for improvement of its shortcomings. In this study, a template was produced by pure aluminum piece with anodized production (concave) through the nanoimprinting process fabricating nanostructures (convex) on the surface of power chain, resulting in surface modification of power chain. The different nanoimprinting process parameters (e.g., imprinting temperature, imprinting pressure, imprinting time, and demolding temperature) were used to produce nanostructures on the surface of power chain. The results of this study show that the contact angle of the power chain became larger after nanoimprinting surface treatment. The hydrophilic properties of power chain have been turned into hydrophobic properties. Unmodified power chain before water absorption is about 4%, while a modified water absorbance is about 2%–4%.

Influence of Surface Modification on Aqueous Lubrication of Elastomers

2005 ◽  
Author(s):  
S. Lee ◽  
N. D. Spencer
Keyword(s):  
Surface Modification ◽  
Hydrophobic Interactions ◽  
Pressure Coefficient ◽  
Elastohydrodynamic Lubrication ◽  
Low Pressure ◽  
Oxygen Plasma Treatment ◽  
Aqueous Environment ◽  
Aqueous Lubrication ◽  
Pdms Surface ◽  
Coefficient Of Viscosity

Water is generally not an efficient lubricant for most tribosystems due to its extremely low pressure-coefficient of viscosity. This barrier is less important, however, when elastomers are employed as tribopairs, since a low-pressure, conformal contact is readily achieved under these conditions, and thus the isoviscous-elastic lubrication (or soft elastohydrodynamic lubrication, “soft EHL”) mechanism can be activated. Isoviscous-elastic lubrication does not necessitate the increase of viscosity under pressure. The aqueous lubrication of elastomers, however, requires a careful control of surface properties of tribopairs since hydrophobic interactions between the sliding surfaces in water can result in the failure of lubricating films to form at low sliding speeds. In this context, we have investigated the influence of surface modification of an elastomer, poly(dimethylsiloxane) (PDMS), on its aqueous lubrication properties. A dramatic reduction in frictional forces has been observed upon hydrophilization by oxygen-plasma treatment when PDMS was slid against PDMS in an aqueous environment. A similar effect was also observed when the PDMS surface was coated with a variety of copolymers that possess amphiphilic characteristics. This effect is attributed to the removal of the strong hydrophobic interaction between PDMS surfaces in water, thereby enabling the soft EHL mechanism to predominate. This study demonstrates the significance of surface modification in allowing effective soft EHL of an elastomer to take place.

UV/ozone Surface Modification for Long-term Stable Hydrophilic Surface of Polymer Microfluidic Devices

MRS Advances ◽  
2016 ◽  
Vol 1 (11) ◽  
pp. 743-748 ◽  
Author(s):  
Shogo Uehara ◽  
Tsukasa Kawabe ◽  
Peter Wood ◽  
Osamu Tsuji
Keyword(s):  
Surface Modification ◽  
Temperature Control ◽  
Polymer Materials ◽  
Ex Situ ◽  
Ozone Treatment ◽  
Oxygen Plasma Treatment ◽  
Hydrophilic Surfaces ◽  
Hydrophobic Recovery ◽  
Uv Ozone

ABSTRACTFaster and more effective surface modification processes of polymer materials by UV/ozone treatment were investigated. The employment of ex-situ generated ozone and/or temperature control contributed to the faster and more effective modification. The UV/ozone treatment showed long-term stable hydrophilic surfaces for 6 months, in contrast to oxygen plasma treatment, which showed hydrophobic recovery. XPS analysis revealed that UV/ozone treatment with ex-situ generated ozone and temperature control added ester (-COOR) on COP sample compared to UV/ozone treatment without the additional ozone and temperature control.

scholarly journals Surface Treatment on Physical Properties and Biocompatibility of Orthodontic Power Chains

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
H. C. Cheng ◽  
M. S. Chen ◽  
B. Y. Peng ◽  
W. T. Lin ◽  
Y. K. Shen ◽  
...  
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Physical Properties ◽  
Surface Treatment ◽  
Water Absorption ◽  
Absorption Rate ◽  
Pure Aluminum ◽  
Polymer Materials ◽  
Water Absorption Rate ◽  
Anodization Process

The conventional orthodontic power chain, often composed of polymer materials, has drawbacks such as a reduction of elasticity owing to water absorption as well as surface discoloration and staining resulting from food or beverages consumed by the patient. The goal of this study was to develop a surface treatment (nanoimprinting) for orthodontic power chains and to alleviate their shortcomings. A concave template (anodic alumina) was manufactured by anodization process using pure aluminum substrate by employing the nanoimprinting process. Convex nanopillars were fabricated on the surface of orthodontic power chains, resulting in surface treatment. Distinct parameters of the nanoimprinting process (e.g., imprinting temperature, imprinting pressure, imprinting time, and demolding temperature) were used to fabricate nanopillars on the surface of orthodontic power chains. The results of this study showed that the contact angle of the power chains became larger after surface treatment. In addition, the power chains changed from hydrophilic to hydrophobic. The power chain before surface treatment without water absorption had a water absorption rate of approximately 4%, whereas a modified chain had a water absorption rate of approximately 2%–4%. Furthermore, the color adhesion of the orthodontic power chains after surface modification was less than that before surface modification.

scholarly journals Surface modification of PMMA polymer and its composites with PC61BM fullerene derivative using an atmospheric pressure microwave argon plasma sheet

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Andrzej Sikora ◽  
Dariusz Czylkowski ◽  
Bartosz Hrycak ◽  
Magdalena Moczała-Dusanowska ◽  
Marcin Łapiński ◽  
...  
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Chemical Composition ◽  
Water Contact Angle ◽  
Plasma Sheet ◽  
Atmospheric Pressure ◽  
Argon Plasma ◽  
Fullerene Derivative ◽  
Water Contact ◽  
Pmma Polymer

AbstractThis paper presents the results of experimental investigations of the plasma surface modification of a poly(methyl methacrylate) (PMMA) polymer and PMMA composites with a [6,6]-phenyl-C61-butyric acid methyl ester fullerene derivative (PC61BM). An atmospheric pressure microwave (2.45 GHz) argon plasma sheet was used. The experimental parameters were: an argon (Ar) flow rate (up to 20 NL/min), microwave power (up to 530 W), number of plasma scans (up to 3) and, the kind of treated material. In order to assess the plasma effect, the possible changes in the wettability, roughness, chemical composition, and mechanical properties of the plasma-treated samples’ surfaces were evaluated by water contact angle goniometry (WCA), atomic force microscopy (AFM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The best result concerning the water contact angle reduction was from 83° to 29.7° for the PMMA material. The ageing studies of the PMMA plasma-modified surface showed long term (100 h) improved wettability. As a result of plasma treating, changes in the samples surface roughness parameters were observed, however their dependence on the number of plasma scans is irregular. The ATR-FTIR spectra of the PMMA plasma-treated surfaces showed only slight changes in comparison with the spectra of an untreated sample. The more significant differences were demonstrated by XPS measurements indicating the surface chemical composition changes after plasma treatment and revealing the oxygen to carbon ratio increase from 0.1 to 0.4.

scholarly journals Water uptake of various electrospun nonwovens

2020 ◽  
Vol 6 (3) ◽  
pp. 155-158
Author(s):  
Katharina Wulf ◽  
Volkmar Senz ◽  
Thomas Eickner ◽  
Sabine Illner
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Water Absorption ◽  
Water Uptake ◽  
Biomedical Applications ◽  
High Surface ◽  
Volume Ratio ◽  
Polymer Composition ◽  
Water Wetting ◽  
Morphology Changes

AbstractIn recent years, nanofiber based materials have emerged as especially interesting for several biomedical applications, regarding their high surface to volume ratio. Due to the superficial nano- and microstructuring and the different wettability compared to nonstructured surfaces, the water absorption is an important parameter with respect to the degradation stability, thermomechanic properties and drug release properties, depending on the type of polymer [1]. In this investigation, the water absorption of different non- and plasma modified biostable nanofiber nonwovens based on polyurethane, polyester and polyamide were analysed and compared. Also, the water absorption by specified water wetting, the contact angle and morphology changes were examined. The results show that the water uptake is highly dependent on the surface modification and the polymer composition itself and can therefore be partially changed.

scholarly journals Tuning the Surface Wettability of Cyclic Olefin Copolymer by Plasma Treatment and Graphene Oxide Deposition and Reduction

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2305
Author(s):  
Fadi Dawaymeh ◽  
Yawar Abbas ◽  
Maryam Khaleel ◽  
Anas Alazzam ◽  
Nahla Alamoodi
Keyword(s):  
Contact Angle ◽  
Plasma Treatment ◽  
Treatment Duration ◽  
Chemical Reduction ◽  
Surface Wettability ◽  
Oxygen Plasma Treatment ◽  
Microfluidic Channels ◽  
Cyclic Olefin Copolymer ◽  
Cyclic Olefin ◽  
Reduction Methods

Selective altering of surface wettability in microfluidic channels provides a suitable platform for a large range of processes, such as the phase separation of multiphase systems, synthesis of reaction controlled, nanoliter sized droplet reactors, and catalyst impregnation. Herein we study the feasibility to tune the wettability of a flexible cyclic olefin copolymer (COC). Two methods were considered for enhancing the surface hydrophilicity. The first is argon/oxygen plasma treatment, where the effect of treatment duration on water contact angle and COC surface morphology and chemistry were investigated, and the second is coating COC with GO dispersions of different concentrations. For enhancing the hydrophobicity of GO-coated COC surfaces, three reduction methods were considered: chemical reduction by Hydroiodic acid (HI), thermal reduction, and photo reduction by exposure of GO-coated COC to UV light. The results show that as the GO concentration and plasma treatment duration increased, a significant decrease in contact angle was observed, which confirmed the ability to enhance the wettability of the COC surface. The increase in hydrophilicity during plasma treatment was associated with the increase in surface roughness on the treated surfaces, while the increase during GO coating was associated with introducing oxygen-containing groups on the GO-coated COC surfaces. The results also show that the different reduction methods considered can increase the contact angle and improve the hydrophobicity of a GO-coated COC surface. It was found that the significant improvement in hydrophobicity was related to the reduction of oxygen-containing groups on the GO-coated COC modified surface.

scholarly journals Physical Properties of Thermoplastic Starch Derived from Natural Resources and Its Blends: A Review

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1396
Author(s):  
Z. N. Diyana ◽  
R. Jumaidin ◽  
Mohd Zulkefli Selamat ◽  
Ihwan Ghazali ◽  
Norliza Julmohammad ◽  
...  
Keyword(s):  
Thermoplastic Starch ◽  
Natural Fibre ◽  
Polymer Materials ◽  
Secondary Pollution ◽  
Wide Range ◽  
Potential Applications ◽  
Long Time ◽  
To Come ◽  
Main Component ◽  
Significant Attention

Thermoplastic starch composites have attracted significant attention due to the rise of environmental pollutions induced by the use of synthetic petroleum-based polymer materials. The degradation of traditional plastics requires an unusually long time, which may lead to high cost and secondary pollution. To solve these difficulties, more petroleum-based plastics should be substituted with sustainable bio-based plastics. Renewable and natural materials that are abundant in nature are potential candidates for a wide range of polymers, which can be used to replace their synthetic counterparts. This paper focuses on some aspects of biopolymers and their classes, providing a description of starch as a main component of biopolymers, composites, and potential applications of thermoplastics starch-based in packaging application. Currently, biopolymer composites blended with other components have exhibited several enhanced qualities. The same behavior is also observed when natural fibre is incorporated with biopolymers. However, it should be noted that the degree of compatibility between starch and other biopolymers extensively varies depending on the specific biopolymer. Although their efficacy is yet to reach the level of their fossil fuel counterparts, biopolymers have made a distinguishing mark, which will continue to inspire the creation of novel substances for many years to come.

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