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Synthesis of UV-Curable high refractive index using acryl resin based on 4,4`-Thiobisbenzenthiol
석웅철,권세진,강주희,송호준,이상국 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
The high refractive index are the most mainly important factors for optical application, such as lenses, optical cables, anti-refractive (AR) coating, etc. The general approach to increase the refractive indices of polymers is the introduction of sulfur atoms, which have a high atomic refraction with high atomic refraction with a low molar volume and high molar refraction according to the Lorentz-Lorenz equation. Recently, photo-curing resins using acryl monomers have been developed for advanced optical application. UV-curing process is one of the most importance techniques owing to low environmental, low consumption of energy and low demand on equipment. Acryl resins have various outstanding properties such as rapid curing time, excellent optical properties, and rapid curing time via photo-induced radical polymerization.
석웅철,권세진,강주희,송호준,이상국 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Polyvinylpyrrolidone (PVP) has been used as glue stick, hot-melt adhesives, special additive for batteries, ceramics and inkjet paper. In addition, since it is biocompatible, it can be applied as a medical adhesive. Most acrylic polymers are flexible due to their low glass transition temperature and can be used as pressure-sensitive adhesives (PSAs) in various fields because their physical properties can be easily controlled according to monomer composition. The hydrophilicity of the adhesives for transdermal drug delivery patch is an important factor that can control the affinity with the drug. In this study, we tried to control hydrophilicity through blending of PVP and acrylic PSAs for develop a pressure-sensitive adhesive for transdermal drug delivery patches. Hydrophilic acrylic polymers were synthesized by free-radical polymerization in order to improve miscibility with hydrophilic PVP.
석웅철,권세진,강주희,송호준,이상국 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Poly(glycerol sebacate) (PGS polymer), a tough elastomer, has been proposed for tissue engineering applications due to its desired mechanical properties, biocompatibility and controlled degradation. Acrylic pressure-sensitive adhesives (Acrylic PSAs) are used as pressure sensitive adhesives in various application fields. In order to apply the pressure-sensitive adhesive to the microneedle patch, it is necessary to control the hydrophilic property. In this study, we fabricated a pressure-sensitive adhesives by blending of PGS polymer and acrylic PSAs. The blend of PGS polymer and acrylic polymer improves adhesion of the polymer and can control the hydrophilicity. In order to improve miscibility with PGS polymer, we additionally synthesized acrylic polymer with hydrophilic properties using free-radical polymerization. Synthesized polymers and blending properties were characterized FT-NMR, FT-IR, DSC, AFM and contact angle analyzer.
Synthesis and Characterization of Hydrophilic Acrylic Polymers via Radical-Polymerization
석웅철,김석조,임종태,권세진,강주희,송호준,이상국 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Acrylic pressure-sensitive adhesives (acrylic PSAs) with a low glass transition temperature are used as pressure sensitive adhesives in various application fields, such as electronics, automobiles, office automation, packing and daily necessities. Acrylic PSAs are made from higher alky esters of acrylate without need of tackifiers and provide excellent physical properties. Monomer composition and molecular weight of the polymer determine most of the adhesive’s properties. In this study, we synthesized with hydrophilic acrylic PSAs that is applicable to medical patches. The hydrophilicity of acrylic PSAs was controlled by ratio of 2-ethylhexyl acrylate (2-EHA) and hydroxyethyl acrylate (HEA). Synthesized acrylic polymer were characterized using Fourier Transfer Nuclear Magnetic Resonance (FT-NMR), Fourier Transform Infrared Spectroscopy (FT-IR), Differential Scanning Calorimetry (DSC), Gel Permeation Chromatography (GPC), Peel Tester and Contact Angles analyzer.
Fabrication of UV-Curable Acrylic Pressure-Sensitive Adhesive for Medical Patch
석웅철,송민성,임종태,권세진,강주희,송호준,이상국 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Acrylic PSAs are made from higher alky esters of acrylate without need of tackifiers and provide excellent physical properties. To improve the adhesion of acrylic PSAs, a party of the adhesive chain is cured to improve cohesion force. For the curing of acrylic PSAs, an isocyanate-based curing agent is generally used. However, the isocyanated curing agent has a long-curing time and exhibits high toxicity when remaining. In this study, we were introduced UV-curing system for adhesive curing. UV-curing system is rapid curing time and non-toxicity. UV-curable acrylic PSAs were fabricated by blending pre-polymer, synthesized via free-radical polymerization, and acrylate monomers. Synthesized pre-polymer and UV-curable pressure-sensitive adhesive were characterized using Fourier Transfer Nuclear Magnetic Resonance (FT-NMR), Fourier Transform Infrared Spectroscopy (FT-IR), Gel Permeation Chromatography (GPC), Peel Tester and Contact Angle Analyzer.
석웅철,임종태,권세진,강주희,송호준,이상국 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Acrylic Pressure-sensitive adhesives (acrylic PSAs) are made from higher alkyl esters of acrylate without need of tackifiers and provide excellent physical properties. Acrylic PSAs with a low glass transition temperature are used as pressure sensitive adhesives in various application fields, such as electronics, automobiles, office automation, packing and medical application such as medical patch. Hyaluronic acid (HA) is an anionic, non-sulfated glycosaminoglycan distributed widely throughout connective, epithelial, and neural tissues. In order to apply the adhesive to the medical patches, it is necessary to evaluate the affinity of the adhesive and the drug. In this study, we conducted an evaluated the affinity of acrylic PSAs and HA for application to medical patches. Affinity was determined by adhesion between acrylic PSAs and HA. The adhesion strength between acrylic PSAs and HA was characterized by Universal Testing Machine (UTM).