Reverse hydrophobic PDMS surface to hydrophilic by 1‐step hydrolysis reaction

Abstract

Hydrophilic modification on the surface of polymer polydimethylsiloxane (PDMS) material is a key step for its application in biomaterial, bioengineering, and so on. In this article, a novel and effective method was proposed to reverse hydrophobic surface to hydrophilic by 1‐step hydrolysis of Si―O bond to produce hydrophilic hydroxyl group. The hydrophilizing reagent 2‐(trimethylsiloxy) ethyl methacrylate (TMSEMA) was used during the copolymerization of polydimethylsiloxane prepolymer (DMS U21). The prepared PDMS film was subjected to 1‐step surface hydrophilic reversal treatment using KOH solution to produce hydroxyl groups on the surface. The contact angle, attenuated total reflection Fourier transform infrared spectra, and equilibrium water content (EWC) measurements were conducted on PDMS films. The results showed that TMSEMA content had no obvious impact on the contact angle and EWC value of untreated PDMS. After reversal treatment, the contact angle decreased from 94° to 15°, and the EWC value increases to 10% when the TMSEMA content was 15 wt%. The spectrum proved that the reverse reaction produced hydroxyl and carboxylate on the surface. The hydrophilic stability, surface morphology, and protein adsorption properties of PDMS film were also investigated. This study can provide new ideas and further reference for improving the hydrophilicity of PDMS surface.

Bacterial Cellulose and Emulsified AESO Biocomposites as an Ecological Alternative to Leather

“…In the composite BC/AESO/S, the appearance of new peaks was observed, namely, at 1258 cm −1 (CH vibration in Si-CH 3 ) and at 791 cm −1 (NH 2 and Si-CH 3 ), confirming the incorporation of modified amino-PDMS into the BC composite [55][56][57]. When PEG 400 was used in the polymer mixture, it was also observed at the peak at 1575 cm −1 that is attributed to the vibration modes of NH 2 groups [58].…”

Development of novel bacterial cellulose composites for the textile and shoe industry

“…The main peaks for the samples treated with S based product are located at 3340 cm −1 (O–H and N–H stretching), 2962 cm −1 and 2916 cm −1 (asymmetric and symmetric CH 3 stretching in Si–CH 3 ), 1627 cm −1 and 1558 cm −1 (N–H deformation in amine groups), 1450 cm −1 and 1250 cm −1 (CH 3 asymmetric and symmetric bending in Si–CH 3 ), 1404 cm −1 (CH 2 bending), 1080 cm −1 and 1018 cm −1 (asymmetric and symmetric Si–O–Si stretching), 864 cm −1 and 787 cm −1 (−CH 3 rocking and Si–C stretching in Si–CH 3 ) (Hashem et al ., ; Cai et al ., ; Johnson et al ., ; Zhang et al ., ).…”

Robust solvent‐free fabrication and characterization of (polydimethylsiloxane‐co‐2‐hydroxyethylmethacrylate)/poly (ethylene glycol) methacrylate (PDMS‐HEMA)/PEGMA hydrogels

“…This is in agreement with previous work by Lin et al These results also supported the WCA analysis, as hydrophilicity increased with increasing PEGMA content. In our previous research studies, protein adsorption suppression was linked to increasing hydrophilicity; hence, increased hydrophilicity and protein adsorption suppression would make PDMS‐HEMA‐PEGMA hydrogel suitable in biomaterial applications.…”