PDMS Material Models for Anti-fouling Surfaces Using Finite Element Method

Thanakhun, Kotchakorn; Puttapitukporn, Tumrong

doi:10.4186/ej.2019.23.6.381

Cited by 13 publications

(11 citation statements)

References 19 publications

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“…The Mooney-Rivlin constitutive model is a special form of polynomial model and expressed by functions of I 1 and I 2 , which can be used for fitting the medium deformation stages of materials. For the Mooney-Rivlin model, the three-parameter and five-parameter strain-energy density function can be respectively expressed as [24]:…”

Section: Hyperelastic Constitutive Modelsmentioning

confidence: 99%

Mechanical Behavior and Constitutive Model Characterization of Optically Clear Adhesive in Flexible Devices

et al. 2022

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Optically clear adhesive (OCA) has been widely used in flexible devices, where wavy stripes that cause troublesome long-term reliability problems often occur. The complex mechanical behavior of OCA should be studied, as it is related to the aforementioned problems. Therefore, it is necessary to establish reasonable mechanical constitutive models for deformation and stress control. In this work, hyperelastic and viscoelastic mechanical tests were carried out systematically and relative constitutive models of OCA material were established. We found that temperature has a great influence on OCA’s mechanical properties. The stress and modulus both decreased rapidly as the temperature increased. In the static viscoelasticity test, the initial stress at 85 °C was only 12.6 kPa, 57.4% lower than the initial stress at 30 °C. However, in the dynamic test, the storage modulus monotonically decreased from 1666.3 MPa to 0.6628 MPa as the temperature rose, and the decline rate reached the maximum near the glass transition temperature (Tg = 0 °C). The test data and constitutive models can be used as design references in the manufacturing process, as well as for product reliability evaluation.

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Section: Hyperelastic Constitutive Modelsmentioning

confidence: 99%

Mechanical Behavior and Constitutive Model Characterization of Optically Clear Adhesive in Flexible Devices

et al. 2022

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“…At this stage, anaerobic microorganisms, associated with metal corrosion processes, are dominant [ 8 ]. Regarding hydrophobic polymers, polydimethylsiloxane (PDMS) is one of the non-toxic and inexpensive polymers widely studied for antifouling coating [ 9 , 10 ]. It is preferred because the main chains of PDMS consist of siloxane bonds and side chains of methyl groups.…”

Section: Introductionmentioning

confidence: 99%

“…The soft lithography process is a simple, cost-effective and scalable method for modifying PDMS surfaces into highly hydrophobic surfaces or superhydrophobic surfaces (WCA > 150°) with micro- and nano-patterns, or nanostructures, such as the surface of a lotus leaf, for antifouling application and corrosion resistance on metal surfaces [ 13 , 14 , 15 ]. However, PDMS does not have high enough mechanical properties, and when the PDMS surface was modified with micropatterns using the soft lithography process, often the micropatterns would collapse [ 9 ]. Inorganic materials, such as alumina (Al 2 O 3 ), titanium dioxide (TiO 2 ), zirconium (ZrO 2 ), silver (Ag) and silica (SiO 2 ) could be used to improve the mechanical properties, roughness and antifouling of the polymer surface [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Developing an Effective and Durable Film for Marine Fouling Prevention from PDMS/SiO2 and PDMS/PU with SiO2 Composites

2022

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Polymer film coating with a highly hydrophobic surface property is a practical approach to prevent fouling of any structures in the marine environment without affecting marine microorganisms. The preparation of a polymer coating, from a simple and easy method of solution blending of hydrophobic polydimethylsiloxane elastomer and hydrophilic polyurethane with SiO2, was carried out in this study, with the aim of improving characteristics, and the coating demonstrated economic feasibility for antifouling application. Incorporation of SiO2 particles into PDMS and PDMS/PU polymer film improved mechanical properties of the film and the support fabrication of micropatterns by means of a soft lithography process. Observations from field emission scanning electron microscope (FESEM) of the PDMS/SiO2 composite film revealed a homogeneous morphology and even dispersion of the SiO2 disperse phase between 1–5 wt.%. Moreover, the PDMS film with 3 wt.% loading of SiO2 considerably increased WCA to 115.7° ± 2.5° and improved mechanical properties by increasing Young’s modulus by 128%, compared with neat PDMS film. Additionally, bonding strength between barnacles and the PDMS film with 3 wt.% of SiO2 loading was 0.16 MPa, which was much lower than the bonding strength between barnacles and the reference carbon steel of 1.16 MPa. When compared to the previous study using PDMS/PU blend (95:5), the count of barnacles of PDMS with 3 wt.% SiO2 loading was lower by 77% in the two-week field tests and up to 97% in the eight-week field tests. Subsequently, when PDMS with 3 wt.% SiO2 was further blended with PU, and the surface modified by the soft lithography process, it was found that PDMS/PU (95:5) with 3 wt.% SiO2 composite film with micropatterns increased WCA to 122.1° ± 2.9° and OCA 90.8 ± 3.6°, suggesting that the PDMS/PU (95:5) with 3 wt.% SiO2 composite film with surface modified by the soft lithography process could be employed for antifouling application.

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“…Side chain groups of PDMS are highly hydrophobic (water contact angle (WCA) 107–110°) [ 13 ] and non-polar groups, which give a low surface energy as well as being excellent for releasing fouling materials [ 14 ]. PDMS is physiologically inactive, very low in toxicity, presents no health hazards, and is inexpensive [ 15 ]. Soft lithography is a simple, low cost and scalable way to fabricate micro- or nanostructures on a PDMS surface to make it become a superhydrophobic surface (WCA > 150°) similar to a lotus-leaf surface [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…PDMS is a material which suitable for soft lithography due to its low shrinkage rates and easy to penetrate to micropattern materials [ 17 ]. However, PDMS does not have high enough strength properties and when PDMS was fabricated with micropatterns of soft lithography the resultant micropatterns would collapse [ 15 , 18 ]. The stiffness of PDMS depends on the degree of crosslinking agent; the higher degree of PDMS network’s crosslinking, the higher its stiffness [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Simple Preparation of Polydimethylsiloxane and Polyurethane Blend Film for Marine Antibiofouling Application

et al. 2021

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A key way to prevent undesirable fouling of any structure in the marine environment, without harming any microorganisms, is to use a polymer film with high hydrophobicity. The polymer film, which was simply prepared from a blend of hydrophobic polydimethylsiloxane elastomer and hydrophilic polyurethane, showed improved properties and economic viability for antifouling film for the marine industry. The field emission scanning electron microscope and energy dispersive X-ray spectrometer (FESEM and EDX) results from the polymer blend suggested a homogenous morphology and good distribution of the polyurethane disperse phase. The PDMS:PU blend (95:5) film gave a water contact angle of 103.4° ± 3.8° and the PDMS film gave a water contact angle of 109.5° ± 4.2°. Moreover, the PDMS:PU blend (95:5) film could also be modified with surface patterning by using soft lithography process to further increase the hydrophobicity. It was found that PDMS:PU blend (95:5) film with micro patterning from soft lithography process increased the contact angle to 128.8° ± 1.6°. The results from a field test in the Gulf of Thailand illustrated that the bonding strength between the barnacles and the PDMS:PU blend (95:5) film (0.07 MPa) were lower than the bonding strength between the barnacles and the carbon steel (1.16 MPa). The barnacles on the PDMS:PU blend (95:5) film were more easily removed from the surface. This indicated that the PDMS:PU blend (95:5) exhibited excellent antifouling properties and the results indicated that the PDMS:PU blend (95:5) film with micro patterning surface could be employed for antifouling application.

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PDMS Material Models for Anti-fouling Surfaces Using Finite Element Method

Cited by 13 publications

References 19 publications

Mechanical Behavior and Constitutive Model Characterization of Optically Clear Adhesive in Flexible Devices

Mechanical Behavior and Constitutive Model Characterization of Optically Clear Adhesive in Flexible Devices

Developing an Effective and Durable Film for Marine Fouling Prevention from PDMS/SiO2 and PDMS/PU with SiO2 Composites

Simple Preparation of Polydimethylsiloxane and Polyurethane Blend Film for Marine Antibiofouling Application

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