Dry sliding friction of ethylene vinyl acetate blocks: Effect of the porosity

Yamaguchi, Takeshi; Sugawara, T.; Takahashi, Motoi; Shibata, Kei; Moriyasu, Kenta; Nishiwaki, Tsuyoshi; Hokkirigawa, Kazuo

doi:10.1016/j.triboint.2017.07.022

Cited by 22 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…reported that when shear stress occurred in the sliding behavior based on the porosity of a foam structure made up of ethylene-vinyl acetate (EVA). [15,16] These structures aggregated after deformation to generate a stronger frictional force. Based on these results, it is expected that the deformation of the surface caused by the compressive force owing to the stent mounting process can have a positive effect on the increase in the retention force.…”

Section: Stent Retention Force Measurementmentioning

confidence: 99%

“…To realize this selective deformation mechanism, it is essential to create a porous structure that can be easily deformed by an external force when applied to the adhesive layer. [14][15][16] Porous structures are generally produced through gas saturation, template, and porogen methods. [17] These methods are utilized in the fields of biomaterials, optical devices, separation of membranes, sensors, and catalysts.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation of Balloon with Porous Structures in NaCl Vapor Assisted by Amphiphilic Polymer for Stent Delivery System

Lee,

Park,

Kim

et al. 2023

Adv Materials Technologies

View full text Add to dashboard Cite

Recently, bioabsorbable vascular stents (BVSs) are actively studied owing to their ability to dissolve within the human body. However, despite their advantages, BVSs often dislodge from the expandable balloon‐based delivery system when transported to the lesion site. In this study, a novel methodology aiming at increasing the retention force between the stent and the delivery system is presented. The breath‐figure method is adopted to form a porous structure and enhance adhesion. Additionally, numerical and experimental methods are used to evaluate the effect of surface tension between two immiscible fluids (polymeric solutions and droplets). To control the interfacial tension between the solution and droplets, an amphiphilic polymer and NaCl‐added vapor are used. By selecting the appropriate parameters, a sponge‐like structure is prepared on the stent delivery system. To verify its applicability, the two types of structures presented in this study are experimentally compared. These findings provide valuable guidelines for understanding the mechanism of breath‐figure patterns. Thus, the innovative methodology developed in this study demonstrates simplicity and scalability for large‐area production, making it potentially applicable to industrial technologies and offering new insights into biomedical engineering.

show abstract

Section: Stent Retention Force Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of Balloon with Porous Structures in NaCl Vapor Assisted by Amphiphilic Polymer for Stent Delivery System

Lee,

Park,

Kim

et al. 2023

Adv Materials Technologies

View full text Add to dashboard Cite

show abstract

“…Thus, under the same speed and load, PPIs with higher porosity will release more oil from pores to form a lubricating film, which is favorable to alleviate the solid-solid rubbing and reduce the COFs of PPIs. Secondly, higher porosity will lead to smaller contact area and higher contact pressure under the same load [7,8] which will aggravate the solid-solid direct rubbing and increase the COFs of PPIs (Fig. 8).…”

Section: Effects Of Porosity On Friction Properties Of Porous Polyimimentioning

confidence: 99%

“…The tribological performance of PPMs could be affected by many factors [5][6][7][8][9][10][11], such as speed, load, oil viscosity, surface tension, pore diameter, porosity, the type and amount of additives. So far, however, researches related to PPMs have mainly focused on their preparation, the influences of internal solid and/ or oil lubricants on their tribological behaviors [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…There are only few published papers concerning the friction mechanism. Even if elegant works have been reported by Wang' group and Yamaguchi etc., involving the effect of porosity on the tribological performance of porous polymer material [7][8][9][10][11]17], systematic investigations of porous polyimide (PPI) are still lacking. Moreover, PPMs might operate in boundary, mixed and elastohydrodynamic lubrication (EHL) regimes with the increase of the speed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Porosity on the Friction Properties of Porous Polyimide Impregnated with Poly-α-Olefin in Different Lubrication Regimes

et al. 2020

View full text Add to dashboard Cite

Porous polyimide materials (PPIs) having different porosity with a constant pore size were fabricated to further understand the effect of porosity on the friction properties in the boundary lubrication, mixed lubrication and elastohydrodynamic lubrication (EHL) regime, respectively. The tribological behaviors of non-porous polyimide (PI0) immersed in poly-α-olefin oil bath and PPIs impregnated with poly-α-olefin were firstly compared, and the effects of load and porosity on the friction performances were investigated. Results show that as the speed increases, the PPIs impregnated with oil exhibit the same friction coefficient (COF) change trend as PI0 immersed in poly-α-olefin oil, which is consistent with the stribeck curve, but the COFs in whole velocity range are higher, and the EHL arrived at a higher speed. The EHL critical speed of PPIs impregnated with oil, as well as the COFs during whole lubricating regime are closely related to the load and the porosity of the material. It mainly depends on two opposite effects of porosity on the friction properties. On one hand, PPIs with higher porosity will release more oil from pores under compression to form a lubricating film, on the other hand, higher porosity will lead to higher contact pressure under the same load, and provide larger contact areas as a result of the increase in the elastic collapse area, which will aggravate the solid-solid direct rubbing and increase the COFs.

show abstract

Effect of Porosity and Normal Load on Dry Sliding Friction of Polymer Foam Blocks

et al. 2018

View full text Add to dashboard Cite

Dry sliding friction of ethylene vinyl acetate blocks: Effect of the porosity

Cited by 22 publications

References 15 publications

Formation of Balloon with Porous Structures in NaCl Vapor Assisted by Amphiphilic Polymer for Stent Delivery System

Formation of Balloon with Porous Structures in NaCl Vapor Assisted by Amphiphilic Polymer for Stent Delivery System

Effect of Porosity on the Friction Properties of Porous Polyimide Impregnated with Poly-α-Olefin in Different Lubrication Regimes

Effect of Porosity and Normal Load on Dry Sliding Friction of Polymer Foam Blocks

Contact Info

Product

Resources

About