Robust Hybrid Hydrophilic Coating on a High-Density Polyethylene Surface with Enhanced Mechanical Property

Abstract

Acoustic aeration on a sonochemical surface could have a major impact on sensitivity because of the serious reflection/scattering of sound waves. Recently, we found that the trapped air in the crevices can be reduced by covering the surface with a hydrophilic coating, thus preventing the bubble formation upon ultrasound agitation. Here, we developed an epoxy-based hybrid polymer coating that shows greatly enhanced mechanical adhesion on a high-density polyethylene (HDPE) surface. The strong bonding of C−O−C and the benzene ring as the backbone ensures excellent mechanical strength, and the hydrophilic polar groups of −OH/−NH 2 on dopamine display bubble suppression. The existing −OH groups in the cross-linked matrix, which is constructed by adding the monomer PEGMA and cross-linker PEGDA, form a strong chemical bond with the HDPE surface via dehydration, which largely enhanced the adhesion force. The coated HDPE surface maintained a low contact angle of less than 45°, which is the critical angle for avoiding bubbles, after a long period period of abrasion cycling of 160 times under 9.8 kPa pressure. The coated HDPE surface displayed excellent bubble removal performance under ultrasound agitation from room temperature to 60 °C. The strengthened mechanical adhesion of the epoxy-based hydrophilic coating displays extensive applications on a variety of surfaces for acoustic bubble removal.

High-Capacity Amidoxime-Functionalized β-Cyclodextrin/Graphene Aerogel for Selective Uranium Capture

“…Furthermore, the underwater oil contact angle of GDC was also identified to be 106°. The −COOH and −NH 2 on DMAO and −OH on CMCD contributed to the great hydrophilicity . To gain more insights on oil resistance, adsorption experiments in uranium solution containing oil drops were performed.…”

“…The −COOH and −NH 2 on DMAO and −OH on CMCD contributed to the great hydrophilicity. 42 To gain more insights on oil resistance, adsorption experiments in uranium solution containing oil drops were performed. Mineral oil and dichloromethane were added to the uranium solutions with the oil volume ratios ranging from 20% to 80%.…”

Optical and Structural Properties of Insoluble and Flexible Biodegradable Regenerated Silk Films for Optically Transparent Hydrophilic Coating of Medical Devices

“…The higher the amount of glycerol added, the lowered the WCA value is. According to the results proposed by Klimchuk et al., [ 29 ] a WCA of less than 45° was the critical WCA to avoid bubble formation on the surfaces of ultrasonic sensors upon ultrasound agitation. Therefore, SF films with glycerol proposed in our study showed good hydrophilicity with low WCA that can be applied as biodegradable hydrophilic coatings for low‐cost single use medical devices, since they do not require humidity or temperature control to maintain the hydrophilic property.…”

In Situ Construction of Thermotropic Shape Memory Polymer in Wood for Enhancing Its Dimensional Stability

“…The typical absorptions of 1479 and 751 cm −1 assigned to the −CH2 bending vibration and −CH3 deformation vibration of PMMA appeared in PMP, suggesting the inclusion of MMA in PMP [38,39]. The presence of peaks at 3442 cm −1 and 1627 cm −1 in PMP were attributed to the stretching and bending vibrations of the −OH groups from the absorption moisture, which is characteristic of the PEG segment, indicating that PEGDA was bonded in PMP [40,41]. The sharp peak at 1732 cm −1 was assigned to carbonyl group stretching, and the peaks at 1249 cm −1 and 1143 cm −1 belonged to C−O−C, which existed in PMMA, P(PEGDA) and PMP.…”