• 폴리머
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• 제28권6호
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• pp.531-537
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• 2004

다양한 하프-에스터 아크릴레이트를 합성하기 위하여 다양한 산 무수물에 2-하이드록시에틸 아크릴레이트 (2-hydroxyethyl acrylate)를 반응시켰다. 합성된 하프-에스터 아크릴레이트에 지방족 에폭시 화합물인 네오펜틸글리콜 디글리시딜에테르 (neopentylglycol diglycidylether)를 반응시켜 광경화형 에폭시 변성 아크릴레이트를 제조하였다. 점도는 헥사하이드로프탈산 무수물 (hexahydrophthalic anhydride)을 사용하여 반응시킨 네오펜틸글리콜 디글리시딜에테르-헥사하이드로프탈산 무수물 (NP-HA)이 가장 높았다. 또한 헥사하이드로프탈산 무수물을 사용한 네오펜틸글리콜 디글리시딜에테르-헥사하이드로프탈산 무수물의 광경화물은 비교적 다른 산 무수물을 사용하여 제조한 에폭시 변성 아크릴레이트의 광경화물보다 경도, 인장 강도가 우수하였으며, 5% 무게 감소 온도도 높은 것으로 보아 열적으로 안정하다는 것을 알 수 있었다. 황변 지수값은 숙신산 무수물 (succinic anhydride)을 사용하여 반응시킨 네오펜틸글리콜 디글리시딜에테르-숙신산 무수물 (NP-SA)이 가장 낮았다.

• 접착 및 계면
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• 제20권4호
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• pp.140-145
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• 2019

환경적 관점에서 고분자필름이나 코팅제 산업계에서 이산화탄소와 휘발성 유기화합물의 저감은 가장 중요한 이슈 중의 하나이다. 광경화 시스템은 용제를 사용치 않아 휘발성 유기화합물의 방출을 최소화 할 수 있고 빠른 경화로 인한 에너지 소모가 적은 잇점이 있다. 또한, 생분해성 고분자는 거대한 폐플라스틱의 발생을 고려하면 환경적으로 경제적으로 많은 관심을 받고 있다. 따라서 본 연구에서는 생분해성 고분자인 폴리락타이드 다이올과 폴리에틸렌 글리콜을 폴리올로하여 광경화형 폴리우레탄 아크릴레이트를 합성하였고 자외선에 의해 말단의 아크릴레이트 그룹의 경화반응을 진행하였다. 경화된 필름의 인장강도, 파단율 및 Tg는 폴리락타이드 다이올의 함량 증가와 더불어 증가하였고 친수특성과 열정안정성은 폴리에틸렌 글리콜 함량과 비례하였다. 따라서 친환경적인 폴리올의 함량 조절로 광경화 폴리우레탄 아크릴레이트의 물성이 조절 가능하였다.

• 한국염색가공학회지
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• 제11권4호
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• pp.1-7
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• 1999

Urethane-acrylate propelymers for secondary coating of optical fiber and high - performance material were prepared from the 4,4'-diphenylmethane diisocyanate(MDI), poly(tetramethylene oxide)glycol(PTMG, Mw 650 or 1000), 1,6-hexanediol(HD), 2-hydroxyethyl acrylate(HEA), and dibutyltin dilaurate as a catalyst. UV-Curable polyurethane acrylates were formulated from the urethane-acrylate prepolymers, three types of reactive diluents(DTs) having mono-, di-, and trifunctional-phenoxyethyl acrylate(PEA), hexanediol diacrylate(HDDA), and trimethylolpropane triacrylate(TMPTA), and 1-hydtoxycyclohexyl phenyl ketone(Irgacure 184) as a photoinitiator. The UV-cured films of polyurethane acrylates were obtained by curing using a medium-pressure mercury lamp(U W/cm, $\lambda_{max}=365\;nm)$. In this work, the effects of molecular weights of polyol and diol with low molecular weight into polymer chain on mechanical and dynamic mechanical properties of UV-cured polyurethane acrylates were studied. The structure and properties of the films obtained from the UV photopolymerization of urethane-acrylate prepolymer were investigated by FT-IR spectroscopy, dynamic mechanical measurement, tensile testing, and X-ray diffractometry.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
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• pp.558-561
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• 2005

In-situ photopolymerization of alkyl acrylate monomers in the presence of a nematic fluid provides a cellular matrix of liquid crystalline droplets in which the chemical structure of the encapsulating polymer exerts control over the alignment (anchoring) of the liquid crystalline molecules. Control is obtained by variation of the alkyl side chains and through copolymerization of two dissimilar monofunctional acrylates. Two monofunctional acrylates with opposing tendencies on copolymerization provide control over the tunability of anchoring over a wide temperature range. Using various acrylates we show that a uniform vertical alignment can be achieved over a large area. Utilizing this technique and a nematic with negative dielectric anisotropy, we have fabricated highly flexible liquid crytal based devices, with high contrast and fast response time, without using any alignment layer.

• Fibers and Polymers
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• 제2권3호
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• pp.141-147
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• 2001

The effect of compositions of isophorone diisocyanate (IPDl)/4.4'-diphenylmethane diisocyalate (MDI) and polypropylene oxide diol (PPG, $M_w$: 3000)/1,4-butane diol (BD) on the properties of UV-cured polyurethane acrylate films based on 2-hydroxyethyl acrylate (HEA) was examined. UV-curable polyurethane acrylates were formulated from the prepolymer. trimethylol propane triacrylate (TMPTA) as a reactive diluent, and 1-hydroxycyclohexyl ketone (Irgacure 184) as a photoinitiator. Dynamic mechanical thermal properties and elastic properties of UV-cured polyurethane acrylates was fecund to depend on the chemical composition of IPDl/MDl and PPG/BD. As the BD content increased, the tensile storage modulus of all series samples increased significantly. The storage modulus increased in the order of samples A (IPDI based samples)> samples B (IPDI/MDl (7/3 molar ratio) based samples) > samples C (IPDI/MDl (5/5 molar ratio) based samples at the same composition. Two distinct louts modulus peaks for all samples are observed owing to the softs segment glass transition temperature ($T_gh$) and hard segment glass transition temperature ($T_gh$). The difference between $T_gh$, and $T_gh$, (Δ$T_g$) increases in the order of A > B > C at the same composition. In cycle test, the initial onset strain (%) was found to decrease with increasing BD content in PPG/BD and with increasing MDI content in IPDI/MDl.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 추계학술발표논문집
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• pp.80-83
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• 2009

Application of UV curing technique for poly vinyl chloride (PVC) floor tiles coating has improved the quality of PVC floor. Various formulations including acrylated oligomers based on a polyurethane were blended with reactive monomers, photoinitiators and other additives. The used oligomers are commercial aliphatic urethane acrylates. Thin films were prepared on PVC tiles by bar coating with different formulations using UV radiation. The coating resins were characterized by FTIR. The properties of UV-cured films such as gloss grade and adhesion were examined. The properties of UV-cured films dependent on the influence of composition and processing conditions was studied. The investigation was conducted to achieve an optimal domain of composition and desired coating effect.

• 공업화학
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• 제16권3호
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• pp.342-347
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• 2005

하이퍼브랜치 폴리올(HBP-16, 32, 64)과 acrylic acid로부터 광경화형 하이퍼브랜치 아크릴레이트를 합성하였고, 그 물성을 조사하였다. TGA로 측정한 UV 경화필름의 열안정성은 관능기 수가 증가할수록 좀더 높은 온도로 이동하였다. 또한 아크릴 레이트의 관능기 수가 증가할수록 경도, 내마모성, 인장강도가 우수하였으며, 내후성 테스트에서는 아크릴레이트의 관능기수가 증가할수록 황변 지수 값이 증가하는 결과를 보여주었다.

• Bulletin of the Korean Chemical Society
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• 제22권8호
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• pp.793-794
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• 2001

• 대한화장품학회지
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• 제33권1호
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• pp.7-10
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• 2007

수용성 폴리머와 계면활성제의 상호작용을 레올로지와 표면 장력을 측정하여 연구하였다. 본 연구에 사용된 폴리머는 acrylates/$C_{10-30}$ alkyl acrylate crosspolymer (AC), ammonium acryloyldimethyltaurate/VP copolymer (AV)이다. 계면활성제는 PEG-40 hydrogenated castor oil (HC), polysorbate 60 (P60)이다. HC와 P60은 AC 폴리머 주위에서 마이셀을 형성하여 점도를 증가하였다. 그러나, HC는 P60보다 보다 높은 농도 범위에서 점도 증가 거동을 보였다. 같은 농도 범위에서 계면활성제들의 표면장력을 비교해보면, 표면장력이 AC/HC의 농도 증가에 따라 증가한 반면, AC/P60의 농도증가에 대해서는 거의 증가하지 않았다. 이런 결과는 AC/HC 사이의 마이셀이 강하게 조직화된 구조를 형성하기 때문으로 추정된다.

• 청정기술
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• 제23권2호
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• pp.148-157
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• 2017

To prepare UV-curable polyurethane-acrylate oligomer, NCO-terminated urethane prepolymers with trimethylolpropane, [TMP; 0 (0), 0.1 (0.021) and 0.2 (0.043) mole (mole fraction)] as crosslinkable tri-functional chain extender were end-capped with pentaerythritol triacrylate [PETA; 2.0 (0.400), 1.7 (0.354) and 1.4 (0.304) mole (mole fraction)] with one hydroxyl group/three vinyl functionalities. The stable as-formulated UV-curable polyurethane-acrylates [stable mixtures of PETA-capped oligomer/reactive acrylic monomer diluents without/with heptadecafluorodecyl methacrylate (PFA; 0, 6 and 9 wt%)] were formed up to 0.2 (0.043) mole (mole fraction) of TMP content in the prepolymer, while homogeneous-mixing failed at 0.3 (0.068) mole (mole fraction), in which the crosslink density in NCO-terminated urethane prepolymer was too high to enable the formation of stable mixture. This study examined the effect of TMP/PETA molar ratio and heptadecafluorodecyl methacrylate (PFA) content (wt%) on the properties of UV-cured polyurethane-acrylates as marine antifouling coating materials. The properties of UV-cured polyurethane-acrylate were found to be significantly dependent on the crosslinkable TMP/PETA ratio and PFA content. With the increasing of the TMP and PFA contents, the contact angles increased, and consequently the surface tension decreased. The adhesion of algae/barnacles to PFA contained film samples were found to be sufficiently weak to allow their easy removal. These results suggest that the UV-cured samples containing PFA have strong potential as coating materials for antifouling applications.