에틸헥실아크릴레이트/하이드록시에틸아크릴레이트 광 접착 코팅 물성

김태이(Taeyee Kim),김동복(Dongbok Kim),강호종(Ho-Jong Kang) 한국고분자학회 2017 폴리머 Vol.41 No.2

광중합에 의하여 2-ethylhexyl acrylate(2-EHA)/2-hydroxyethyl acrylate(2-HEA) 광 접착 수지를 합성하고 2-HEA 첨가가 광중합과 코팅특성에 미치는 영향을 살펴보았다. 수지에 2-HEA 양이 증가할수록 광중합 속도가 증가되어 광 조사 시간에 따른 전환율이 증가됨을 알 수 있었다. 수지 코팅에 적절한 낮은 전환율에서 광조사 시간 및 HEA 함량 증가에 따라 분자량 분포가 급격이 증가되며 이는 코팅성 향상에 도움이 되는 점도 감소를 초래함을 확인하였다. 광 접착 수지의 코팅특성은 수지 점도와 매우 밀접한 관계가 있으며 8~11% 전환율을 갖는 수지가 코팅두께 균일성을 가지며 동시에 코팅성이 우수함을 알 수 있었다. 2-Ethylhexyl acrylate (2-EHA)/2-hydroxyethyl acrylate (2-HEA) optically clear resin (OCR) was synthesized by photopolymerization, and the effect of 2-HEA on photopolymerization was investigated with their coating characteristics. 2-HEA caused the acceleration of photopolymerization; as a result, the conversion could be controlled by UV exposure time as well as the amount of 2-HEA in the resin. The resin having low conversion suitably was needed for good coating characteristics, and low viscosity was found due to the increase of molecular weight distribution by increasing 2-HEA. It was found that coating characteristics were closely related to the viscosity of resin, and appropriate conversion was 8~11% that showed the uniform coating thickness with good coating ability.

하이드록시 에틸아크릴레이트가 광접착 수지 물성에 미치는 영향

김태이(Taeyee Kim),강호종(Ho-Jong Kang) 한국고분자학회 2017 폴리머 Vol.41 No.3

광소자용 무용제 점착제로 사용되는 2-ethylhexyl acrylate(2-EHA)에 2-hydroxyethyl acrylate(2-HEA) 첨가가 광접착 수지 물성에 미치는 영향을 확인하였다. 2-HEA 첨가에 의하여 유리전이온도가 증가하는 것으로 보아 상대적으로 hard한 2-HEA에 의하여 peel strength와 holding power가 증가함을 확인하였으며 이때 최대 2-HEA 함량은 50%임을 알 수 있었다. 이러한 접착력 증가는 2-HEA의 hard한 물성과 함께 함유된 OH 기능기에 의한 친수성 증가에 기인됨을 알 수 있었다. 아울러 2-HEA 첨가는 굴절률 증가 및 헤이즈 증가와 같은 점착제 광학적 특성 변화를 유발시킨다. 광점착제의 문제점인 헤이즈 증가는 열처리에 의하여 개선될 수 있음을 확인하였다. Effect of 2-hydroxyethyl acrylate (2-HEA) on the optical clear resin (OCR) made by solvent free polymerization was studied. It was found that peel strength and holding power increased with increasing of HEA content up to 50% and as a result, the glass transition temperature of adhesive was increased. The enhancement of adhesion properties is due to the increasing hard characteristics of HEA as well as hydrophilicity by OH group in HEA. In addition, HEA caused the increase of refractive index and optical haze. The increase of haze, which caused the optical problem in electronic device, could be controlled by thermal treatment of adhesive.

Alginate/2-HEA/PEGDA를 이용한 pH 민감성 하이드로젤 합성 및 물리화학적 특성 연구

이제윤(Je Yun Lee),박소현(So Hyun Park) 한국고분자학회 2018 폴리머 Vol.42 No.4

본 연구에서는 sodium alginate에 2-hydroxyethyl acrylate를 그래프팅 후, poly(ethylene glycol) diacrylate로 가교시켜 하이드로젤을 제조하였고, 가교제 비율에 따른 물리화학적 분석을 수행하였다. 주사전자현미경 관찰 결과, 하이드로젤은 다공성의 가교구조를 나타내었고, 공극 크기는 대략 10 μm였다. 열적 중량 분석 결과, 가교 밀도가 증가할수록 중량 감소가 적었고 수분 결합력이 높았다. 팽윤 거동은 pH 7.4와 pH 2.5에서 수행되었고, 각각 400~900%, 150~190%의 팽윤을 보였다. 또한 다양한 팽윤 매질에 따라 텍스처 분석을 수행하였다. 증류수보다 buffer에 팽윤된 하이드로젤이 경도가 높았고, 가교 밀도가 증가할수록 경도가 높았다. 결과적으로, 새롭게 합성된 본 하이드로젤은 팽윤 매질 및 가교 밀도에 변화를 줌으로써 조직공학, 3D 프린터, 약물 전달체 등의 생체 재료로 이용가능성이 있음을 시사한다. In this study, hydrogels were prepared by grafting 2-hydroxyethyl acrylate onto sodium alginate and then crosslinking with poly(ethylene glycol) diacrylate. Properties were analyzed according to ratio of crosslinking agent. Scanning electron microscopy showed that the hydrogels were porous structure, and the pore size was about 10 μm. Thermal gravimetric analysis showed that weight loss decreased and water binding capacity was high as the crosslink density increased. Swelling behavior was carried out at pH 7.4 and pH 2.5, with swelling of 400-900% and 150-190%, respectively. Texture analysis was performed according to various swelling media. The hardness of hydrogels swollen in buffer was higher than that of distilled water, and the hardness was higher as the crosslink density increased. As a result, this novel hydrogel has possibilities to be used as biomaterials such as tissue engineering, 3D printer, and drug delivery system by changing swelling medium and crosslinking density.

아크릴 단량체 종류 변화가 대전방지용 수분산 아크릴 폴리우레탄의 물성에 미치는 영향

허우영 ( Woo Young Huh ),윤동구 ( Dong Gu Yun ),송기창 ( Ki Chang Song ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.4

Isophrone diisocyanate (IPDI), polycarbonate diol (PCD)과 dimethylol propionic acid (DMPA)를 출발물질로 하여 수분산 폴리우레탄(waterborne polyurethane dispersion, WPUD)을 합성하였다. 이 WPUD에 아크릴 단량체인 methyl methacrylate (MMA), 2-hydroxyethyl methacrylate (HEMA)와 butyl acrylate (BA)를 각각 첨가하여 다양한 종류의 수분산 아크릴폴리우레탄(waterborne acrylic polyurethane dispersion, AUD)을 합성하였다. 이 AUD와 물에 분산된 다중벽 탄소나노튜브(multi-walled carbon nanotube, MWCNT)를 혼합하여 전도성 코팅 용액을 제조한 후 polycarbonate 시트 위에 도포하여 코팅 도막을 형성하고 물성을 살펴보았다. AUD로부터 제조된 코팅 도막의 연필경도, 내마모성 및 내약품성은 WPUD 보다 향상되었으나, 전기 전도도는 감소하였다. 또한 아크릴 단량체의 종류 변화 실험에서는 코팅 도막의 연필경도는 HEMA를 사용한 경우가 가장 우수하였으나, 내마모성, 내약품성 및 전기 전도도는 MMA를 사용한 경우가 가장 우수하였다. Waterborne polyurethane dispersion (WPUD) was prepared from polycarbonate diol (PCD), isophorone diisocyanate (IPDI) and dimethylol propionic acid (DMPA) as starting materials. Then, waterborne acrylic polyurethane dispersion (AUD) was synthesized by reacting the WPUD with different types of acrylate monomers, such as methyl methacrylate (MMA), 2-hydroxyethyl methacrylate (HEMA) and butyl acrylate (BA). Subsequently, the AUD was mixed with multi-walled carbon nanotube (MWCNT) to yield a conductive coating solution, and the mixture was coated on the polycarbonate substrate. The pencil hardness, abrasion resistance and chemical resistance of the coating films from AUD were improved than those from WPUD, while the electrical conductivity of the coating films from AUD was decreased than that of WPUD. Also, the effect of acrylate types on the properties of coating films was investigated. The AUD obtained from HEMA showed the strongest pencil hardness, while the AUD obtained from MMA exhibited the strongest abrasion resistance, chemical resistance and electrical conductivity among several types of acrylate monomers.

아크릴 단량체 종류 변화가 수분산 Polyurethane Dispersion의 물성에 미치는 영향

신용탁 ( Yong Tak Shin ),홍민기 ( Min Gi Hong ),김병석 ( Byung Suk Kim ),이원기 ( Won Ki Lee ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),송기창 ( Ki Chang Song ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.5

NCO terminated polyurethane prepolymers were synthesized from isophorone diisocyanate(IPDI), polycarbonate diol(PCD) and dimethylol propionic acid(DMPA). Subsequently, acrylic terminated polyurethanes were prepared by capping the NCO groups of polyurethane prepolymers with different types of acrylate monomers, such as 2-hydroxyethyl methacrylate(HEMA), 2-hydroxyethyl acrylate(HEA) and pentaerythritol triacrylate(PETA). The average particle sizes of the acrylic terminated polyurethane solutions were increased by capping acrylate monomers. Also, the prepared coating films showed better abrasion resistance and pencil hardness than those of pure waterborne polyurethanes. The coating film with PETA exhibited the best abrasion resistance and pencil hardness of coating films prepared with three acrylate monomers.

보문: 공업화학(전기화학, 분석화학 포함)·촉매/반응공학·약물전달기술·기능성 코팅기술 ; 아크릴 단량체의 종류 변화에 의한 수분산 폴리우레탄-아크릴 혼성 용액의 제조

김병석 ( Byung Suk Kim ),홍민기 ( Min Gi Hong ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),이우일 ( Woo Il Lee ),송기창 ( Ki Chang Song ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.3

Isophorone diisocyanate (IPDI), polycarbonate diol (PCD), dimethylol propionic acid (DMPA)를 출발물질로 하여 수 분산 폴리우레탄(waterborne polyurethane dispersion, PUD)을 합성하였다. 이 PUD에 아크릴 단량체인 HEMA (2- hydroxyethyl methacrylate):MMA (methyl methacrylate), HEMA:BA (butylacrylate), HEMA:BMA (butyl methacrylate), HEMA:HEA (2-hydroxyethyl acrylate), HEMA:PETA (pentaerytritol triacrylate) 혼합물을 첨가하여 수분산 폴리우레탄 -아크릴 혼성 용액을 제조하였다. 또한 아크릴 단량체의 종류가 수분산 폴리우레탄-아크릴 혼성 용액의 내약품성과 내 마모성에 미치는 영향을 조사하였다. 실험 결과 내약품성은 HEMA와 MMA를 중합한 것이 가장 우수했으며, 내마모 성은 HEMA와 PETA를 중합한 것이 가장 우수한 결과를 나타내었다. Waterborne polyurethane dispersions (PUD) were synthesized from isophorone diisocyanate (IPDI), polycarbonate diol (PCD) and dimethylol propionic acid (DMPA) as starting materials. Subsequently, polyurethane-acrylic hybrid solutions were prepared by reacting the PUD with different types of acrylate monomers, such as HEMA (2- hydroxyethyl methacrylate):MMA (methyl methacrylate), HEMA:BA (butylacrylate), HEMA:BMA (butyl methacrylate), HEMA:HEA (2-hydroxyethyl acrylate), HEMA:PETA (pentaerytritol triacrylate) mixture. Also, the effects of acrylate types on the chemical resistance and the abrasion resistance of polyurethane-acrylic hybrid solutions were investigated. The test results showed that the HEMA: MMA mixture had the strongest chemical resistance, while the HEMA: PETA mixture had the strongest abrasion resistance among several types of acrylate mixtures.

Solvent-Free Deposition of Ultrathin Copolymer Films with Tunable Viscoelasticity for Application to Pressure-Sensitive Adhesives

Moon, Heeyeon,Jeong, Kihoon,Kwak, Moo Jin,Choi, Siyoung Q.,Im, Sung Gap American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.38

<P>A new fabrication method for an ultrathin (500 nm thick) pressure-sensitive adhesive (PSA) was demonstrated by utilizing a series of in situ cross-linked viscoelastic copolymer films. Viscoelastic films composed of poly(2-hydroxyethyl acrylate-<I>co</I>-2-ethylhexyl acrylate) were synthesized successfully in a one-step manner by an initiated chemical vapor deposition (iCVD) process, where free-radical polymerization is triggered in the vapor phase either by heat or UV, or a combination of both. In particular, the photoinitiated chemical vapor deposition method generated a highly cross-linked polymer film, whereas cross-linking of the copolymer film was suppressed greatly in the conventional thermal iCVD method. A combination of thermal and photoinitiated chemical vapor deposition could regulate the cross-linking density of the copolymer films. We controlled the cross-linking density of the copolymer films to exhibit a viscoelastic property so that they would readily adhere to various kinds of substrates with only 500 nm thick copolymer PSA. The adhesion performance of the PSA was systematically optimized by tuning the copolymer composition as well as the cross-linking density, and consequently a high shear strength of more than 85.2 ± 5 N/cm<SUP>2</SUP> was achieved despite the 500 nm thickness. In addition, the PSA was completely transparent. We expect that the ultrathin PSAs developed in this work will be utilized widely for the realization of various soft electronic devices, which usually require strong adhesion, tunable viscoelastic properties, and optical transparency.</P> [FIG OMISSION]</BR>

Hydroxyethyl Methacrylate와 Methyl Methacrylate의 첨가량 변화가 수분산 폴리우레탄-아크릴 혼성 용액의 물성에 미치는 영향

김병석 ( Byung Suk Kim ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),변태강 ( Tae Gang Byun ),송기창 ( Ki Chang Song ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4

Waterborne polyurethane dispersions (PUD) were synthesized from isophorone diisocyanate (IPDI), polycarbonate diol (PCD) and dimethylol propionic acid (DMPA) as starting materials. Subsequently, waterborne polyurethane- acrylic hybrid solutions were prepared by reacting the PUD with different amounts of the mixture of acrylate monomers, HEMA (2-hydroxyethyl methacrylate) and MMA (methyl methacrylate). As a result, the average particle size of waterborne polyurethane-acrylic hybrid solutions was increased with increasing the addition amounts of acrylate monomers. Also, the prepared coating films from waterborne polyurethane-acrylic hybrid solutions showed better abrasion resistance and chemical resistance than those of pure PUD.

pH-Sensitive Hydrogels Based on (Meth)Acrylates and Itaconic Acid

Simonida Lj. Tomić,Marija M. Babić,Katarina M. Antić,Jovana S. Jovašević Vuković,Neda B. Malešić,Jovanka M. Filipović 한국고분자학회 2014 Macromolecular Research Vol.22 No.11

Novel hydrogels based on 2-hydroxyethyl methacrylate (HEMA), itaconic acid (IA) and different poly(alkylene glycol) (meth)acrylates (PAGM) (P(HEMA/IA/PAGM)) were synthesized. We investigated the influenceof different PAGM components, with acrylic or methacrylic acid residues in the main chain and ethylene glycol (EG)and/or propylene glycol (PG) units in pendant chains of varying length, on the nature and inherent properties ofP(HEMA/IA/PAGM) copolymeric hydrogels. Swelling studies revealed pH sensitive behavior of P(HEMA/IA/PAGM)samples. Hydrogel structure and morphology were characterized by Fourier transform infrared (FTIR) spectroscopyand scanning electron microscopy (SEM), which confirmed their chemical structure and differences in pore size. The shear modulus values for P(HEMA/IA/PAGM) hydrogels were close to that of PHEMA, but slightly lower thanthe value for P(HEMA/IA). Cephalexin (CEX) drug release profiles from P(HEMA/IA/PAGM) samples showed amarked dependence on the PAGM component. The presence of IA also influenced the release rate of CEX, leadingto a faster release when IA was combined with the more hydrophilic PAGM component. An in vitro assay of P(HEMA/IA/PAGM) cytotoxicity showed good cell viability. The results obtained indicate that P(HEMA/IA/PAGM) hydrogelproperties were significantly dependent on the PAGM component, meaning that the type of side chains can be usedto tune the characteristics of such biomaterials. These properties make P(HEMA/IA/PAGM) copolymeric hydrogelsapplicable in biomedical and biotechnological fields and controlled drug delivery.

SA/HEMA 라텍스가 도공지 특성에 미치는 영향

권수진(Soojin Kwon),오규덕(Kyudeok Oh),이학래(Hak Lae Lee) 한국펄프·종이공학회 2019 한국펄프·종이공학회 학술발표논문집 Vol.2019 No.4