http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Properties of UV Curable Acrylic PSA with Surface-Modified Silica Nanoparticles
이욱상,이지영,하채명,박근태,남기범,박은영,김세현,이동윤 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
In this study, we fabricated a UV-curable acrylic pressure sensitive adhesives (PSAs) which has surface modified silica nanoparticles (m-SNPs). Acrylic copolymers, such as 2-EHA/AA or 2-EHA/IBOA, were prepared as an adhesive resin through UV polymerization. M-SNPs were modified using octadecyltrichlorosilane and (3-Aminopropyl)tiethoxysilane to control the surface wettability of nanoparticles. We determined adhesion, thermal, and mechanical properties of PSAs composites using UTM and TGA. Furthermore, the dispersity of m-SNPs in acrylic resins were investigated by scanning electron microscope. PSAs can be applied in the field of display panel, mobile industry, and packaging.
Mechanical and Adhesive Properties of UV Curable Acrylic PSA Using Modified Cellulose Nanofiber
이욱상,이동윤,김도영,남기범 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Acrylic pressure sensitive adhesives (PSA) have been widely used in industries such as displays, packaging and Automobile. With the recent development of electronic devices, the demand for adhesives with strong mechanical properties and adhesive strength is increasing, and efforts are being made to improve mechanical properties. In this study, eco-friendly filler, and cellulose nanofiber, was added to the adhesive to increase the mechanical properties. CNF with high aspect ratio has the advantages of high modulus, and strength etc. However, the large amount of OH groups on the cellulose surface decrease the dispersibility of CNF in the polymer matrix. Therefore, we conducted surface modification of CNF to improve the dispersibility. Adhesion, thermal, and mechanical properties of PSAs composites were determined using UTM and TGA. the dispersity of m-CNFs in acrylic resins were investigated by scanning electron microscope and polarization Microscope.
Mechanical Properties of Polyolefin Elastomer with Cellulose Nanofiber
남기범,이욱상,이지영,하채명,이동윤 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Plastic waste is appearing as a serious threat to environment, because of its non-biodegradable property. Therefore, cellulose fibers from wood, starch, and bacteria attracted the attention of many research groups due to its biodegradability, flexibility, and mechanical properties to overcome the problems of ordinary plastics. In this work, we fabricated polyolefin elastomer (POE) compounds that contain 80phr of cellulose nanofiber (CNF). To disperse CNF into POE, we adopted two types of POE as a base resin and found optimal composition of them. Dispersed CNF improves Young’s modulus and tensile stress of POE forming micro aggregation in the POE mixtures. The dispersion and aggregation of CNF was observed by SEM and EDS images by the contents of POE and CNF. This study can be applied to rubbery materials that need high mechanical properties and biodegradability such as gasket of vehicles, shoe sole, and packaging.
Photochromic Property of Contact Lens with Spiropyran
이지영,남기범,이욱상,하채명,이동윤 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Photochromic is a phenomenon that changing of color by absorbing light due to the transformation of chemical structure. Spiropyran is well known a dye material that exploit photochromic phenomenon reacted with UV-light. In this study, to apply photochromic phenomenon for color tunable contact lens, we synthesized a functionalized spiropyran dye. The result of functionalization was analyzed by FT-IR, and the photochromic phenomenon was observed by exposing specific wavelength light, UV-light. Furthermore, equilibrium water content, light transmittance, and oxygen permeability were measured to evaluate the properties of the functionalized spiropyran contained contact lens. We expect that it can be used for functional lens such as UV-blocking lens, and color lens.
하채명,이지영,이욱상,남기범,이동윤 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Poly(acrylic acid) (PAA) hydrogel is widely used as biomedical materials due to their biocompatibility. However, hydrogel has disadvantages of low mechanical and adhesion properties. We fabricated a UV-curable hydrogel adhesive with high tack property, peel strength, and adhesive force by adding additives. Herein, the modified cellulose nanofiber (m-CNF) and silica nanoparticles (SNPs) were exploited as additives to increase the internal cohesion of hydrogel adhesive introducing physical bonding networks between the carboxymethyl group of m-CNF and the hydroxyl group of the SiO2 NPs in the hydrogel. Furthermore, cytotoxicity test and drug release test ascertained that hydrogel has an availability as a drug carrier. According to the results, it was expected that this hydrogel nanocomposites could be applied as transdermal drug delivery system.
Improve of Impact Property on PLA/PBAT for Sustainable Packaging
이지영,남기범,이욱상,하채명,류진원,이동윤 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
With the growth of single-use plastic production, the need for biodegradable polymers has increased to reduce plastic wastes. polylactic acid (PLA) has excellent tensile strength as well as biodegradable ability. However, the stiffness of PLA is an obstacle to widen its application such as plastic bag, packaging, and carriers. In this study, poly(butylene adipate-co-terephthalate) (PBAT), an elastic biopolymer, was blended with PLA to improve mechanical property adding poly(butyl acrylate) (PBA) as a compatibilizer. Morphology, mechanical and dynamic viscoelastic properties according to the different content of compatibilizers were analyzed by UTM, FE-SEM and DMA. As a result, it can be applied to a green material such as eco-friendly packaging, coating and disposables.