Abstract
Hydrophilic acrylic pressure-sensitive adhesives (PSAs) were synthesized by controlling the contents of 2-ethylhexyl acrylate (EHA), isobornyl acrylate (IBOA), and 2-hydroxyethyl acrylate (HEA); especially, the characteristic change of the HEA content was analyzed. Surface contact angle of acrylic PSA film decreased from 77.87° to 70.23° in the case of Acryl-2 to Acryl-8 (below HEA 10 wt %). However, the surface contact angle of Acryl-10 to Acryl-40 (HEA 10 wt % to 40 wt %) increased up to 92.29°, indicating hydrophobicity. All acrylic PSA films showed high adhesive force above 1800 gf/25 mm. According to X-ray diffraction (XRD) measurement, hydrophilic acrylic PSAs exhibited amorphous property and it was confirmed that the morphology of acrylic PSA film was significantly affected by the flexibility of the polymer chain and the strength of hydrogen bonding. The affinity with hydrophilic materials for acrylic PSA films was evaluated by T-type peel test, confirming that the affinity with hydrophilic materials is determined by the hydrophilicity of the acrylic PSA film. The synthesized acrylic PSA film is non-toxic regardless of the hydrophilicity.
Highlights
Pressure-sensitive adhesives (PSAs) are representative viscoelastic materials with various applications such as automobiles, liquid crystal display (LCD)/organic light emitting diode (OLED)displays, medical tape/dressing band, etc. [1,2,3,4]
Displays, medical tape/dressing band, etc. [1,2,3,4]. These pressure-sensitive adhesives (PSAs) have the following advantages: (1) they are firmly attached to a general substrate or skin immediately under light pressure and in a short time; (2) the attach and detach process can be repeated after a period of time; (3) they are easier to use than quick reacting two-component type adhesives; and (4) it is easier to control the PSA properties through processes such as monomer composition and curing
We investigated a simple method for evaluating affinity using the peel strength of hydrophilic acrylic PSAs and hydrophilic materials, polyvinyl alcohol (PVA) and hyaluronic acid (HA), and confirmed the potential for medical applications of hydrophilic acrylic PSAs through cytotoxicity and skin irritation tests
Summary
Pressure-sensitive adhesives (PSAs) are representative viscoelastic materials with various applications such as automobiles, liquid crystal display (LCD)/organic light emitting diode (OLED). Solvent type polymerization uses an organic solvent when synthesizing the acrylic PSAs, and it is common to conduct a reaction at a higher temperature of 70–80 ◦ C for the activation of the initiators This method has advantages in synthesis and process control as it is easy to control reaction, heat, and viscosity because of the solvent [11,12,13,14,15,16]. Recent studies have attempted to improve the hydrophilicity of the adhesive by introducing polyethylene glycol (PEG) (a hydrophilic functional group) into styrene–isoprene–styrene (SIS) (a hot-melt adhesive having hydrophobic properties) onto the backbone of the adhesive or blend [25,26] These methods have a disadvantage in that their application is limited, because they can only be applied in the case of a hot-melt type or a solvent type of acrylic PSA. We investigated a simple method for evaluating affinity using the peel strength of hydrophilic acrylic PSAs and hydrophilic materials, polyvinyl alcohol (PVA) and hyaluronic acid (HA), and confirmed the potential for medical applications of hydrophilic acrylic PSAs through cytotoxicity and skin irritation tests
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