• Korean Chemical Engineering Research
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• 제54권2호
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• pp.206-212
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• 2016

Experimental data are reported on the phase equilibrium of propoxylated neopentyl glycol diacrylate in supercritical carbon dioxide. Phase equilibria data were measured in static method at a temperature of (313.2, 333.2, 353.2, 373.2 and 393.2) K and at pressures up to 27.82 MPa. At a constant pressure, the solubility of propoxylated neopentyl glycol diacrylate for the (carbon dioxide + propoxylated neopentyl glycol diacrylate) system increases as temperature increases. The (carbon dioxide + propoxylated neopentyl glycol diacrylate) system exhibits type-I phase behavior. The experimental result for the (carbon dioxide + propoxylated neopentyl glycol diacrylate) system is correlated with Peng-Robinson equation of state using mixing rule. The critical property of propoxylated neopentyl glycol diacrylate is predicted with Joback and Lyderson method.

• Bulletin of the Korean Chemical Society
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• 제22권7호
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• pp.769-771
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• 2001

• 폴리머
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• 제25권4호
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• pp.568-574
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• 2001

Bisphenol A ethoxylate diacrylate를 가교제로 사용하여 PEO계 고분자 고체전해질을 제조하였으며, 이의 전기화학적 특성 및 기계적인 물성을 조사하였다. 제조된 고분자 고체전해질은 이온전도도를 높이기 위해 비휘발성의 PEGDMe [poly(ethylene glycol) dimethyl ether]를 가소제로 도입하였다. 첨가된 PEGDMe 함량이 높을수록 전기전도도는 증가하였다. 최대 이온전도도는 30에서 1.0 ${\times}$ 10$^{-3}$S/cm [Bisphenol A ethoxylate diacrylate ([EO]/[phenol]=15), PEGDMe250 80 wt%, LiCF$_3SO_3$]이었다. 제조된 고분자 전해질의 인장강도는 0.4 ~ 5 MPa이었으며 ${\phi}$=3 mm 봉에 대해 90$^{\circ}$ 및 180$^{\circ}$ 의 굽힘에도 균열을 발생하지 않았다. 리튬 기준전극에 대해 4.5 V 이상의 산화전위에도 전기화학적으로 안정하였다.

• 멤브레인
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• 제14권3호
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• pp.250-257
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• 2004

이산화탄소 분리에 이용하기 위하여 PEG (Poly(ethylene glycol)diacrylate)와 PPG (Poly(propylene glycol) diacrylate)를 광학 중합반응(Photopoly merization)을 이용하여 제조하였다. PEG와 PPG는 분자량이 각각 258과 540이었다. PEG와 PPG의 질량 혼합비(wt%)를 9:1, 8:2, 7:3, 6:4, 5:5로 변화시키면서 막을 제조하였다. $25^{\circ}C$에서 PEG/PPG (9:1)의 이산화탄소 투과도는 28.9 barrel 으로 나타났으며, 선택도($PCO_2$/$PN_2$)는 57.9로 나타났다. 같은 온도에서 PEG/PPG(5:5)로 조성을 변화시켰을 때 이산화탄소 투과도는 40.4 Barrer, 기체선택도($PCO_2$/$PN_2$)는 51.8를 나타냈다 이산화탄소의 투과도는 5:5 > 6:4 > 7:3 > 8:2 > 9:1의 경향을 나타내었다. $35^{\circ}C$로 승온을 하는 경우에 PEG/PPG (9:1)는 45.4 Baller, 선택도($PCO_2$/$PN_2$)는 48.2을 나타냈으며, PEG/PPG (5:5)의 이산화탄소 투과도는 78.9 Barrer을 나타내고 선택도($PCO_2$/$PN_2$)는 33.2로 나타났다. 각각의 온도에서 이산화탄소의 기체선택도($PCO_2$/$PN_2$)는 PPG의 함량이 증가하면서 감소하는 경향을 나타내었다.

• 폴리머
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• 제32권2호
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• pp.95-102
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• 2008

The $\alpha$,$omega$-diacrylate poly(dimethylsiloxane) (DA-PDMS) containing vinyl ester of versatic acid/vinyl acetate (Veova-10/VAc) was prepared by emulsion copolymerization of (DA-PDMS), Veova-10 (with VAc), and auxiliary agents at $85^{\circ}C$ in the presence of ammonium peroxodisulfate (APS) as an initiator. Sodium dodecyl sulfate (SDS) and nonylphenol ethylene oxide-40 units (NP-40) were used as anionic and nonionic emulsifiers, respectively. The resulting copolymers were characterized by using Fourier transform infrared spectroscopy (FT-IR). Thermal properties of the copolymers were studied by using thermogravimetric analysis(TGA) and differential scanning calorimetry (DSC). The morphology of copolymers was also investigated by scanning electron microscopy (SEM) and then the effects of variables such as temperature, agitation speed, surfactant kinds, molecular weights, initiator, and DA-PDMS concentrations on the properties of the silicone-containing Veova-10/VAc emulsions were examined. The calculation of monomer conversion versus time histories indicates that by increasing the DA-PDMS concentration the polymerization rate and the number of polymer particles decrease, respectively.

• 한국염색가공학회지
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• 제22권3호
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• pp.239-245
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• 2010

Breathable waterproof PET fabrics were prepared by the UV coating of UV-curable polyurethaneacrylate(PUA) formulation mixed with polyethyleneglycol(PEG) as a water soluble pore former. The dispersed PEG in the UV-cured coating was extracted by warm water, which can generate individual circular pores uniformly distributed all over the coating instead of pore channels. Accordingly the moisture permeability of the microporously coated fabrics increased substantially with increasing PEG addition without significant reduction of hydrostatic pressure. Also the silicone diacrylate addition in the formulation was beneficial in increasing the hydrostatic pressure. The UV-based microporous coating can be an alternative to conventional thermal curing of solventborne polyurethane coating owing to the enhanced environment friendliness and energy saving.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
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• pp.437-438
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• 2005

A polymer stabilization method is employed to reduce the transition time from field-induced homeotropic(H) state to reflecting planar(P) state in the cholesteric liquid crystal(ChLC) display. To stabilize ChLC by polymer, we mixed ChLC with diacrylate of 2 $wt%{\sim}6$ wt%. Two samples were made with different method of stabilization. For one sample the diacrylate of 2 wt% was polymerized with the ChLC in P state, while for the other sample diacrylate of 16 wt% was polymerized with ChLC in H state. In the former case, the transition time was 1000 times faster then those in the pure sample. In the latter sample, the transition time was 1700 times faster than those in pure ChLC sample.

• Elastomers and Composites
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• 제49권3호
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• pp.199-203
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• 2014

아크릴 단량체인 2-ethylhexyl acrylate (2-EHA), 2-hydroxyethyl acrylate (2-HEA), isobornyl acrylate (IBOA)를 광중합을 통하여 3원 공중합체 시럽을 합성하였다. 이관능기 아크릴 단량체인 1,6-hexanediol diacrylate (HDDA), poly(ethylene glycol) diacrylate (PEGDA, Mn = 250, 575, 700)를 가교제로 사용하여 semi-IPN형 감압성 점착제 (Pressure sensitive adhesives; PSAs)를 UV-광가교 시켜 제조하였다. 가교제 변화에 따른 감압성 점착제의 점착특성, 저장탄성율, 그리고 광학특성을 고찰하였으며, 점착특성과 저장탄성율은 가교제의 화학구조와 분자량에 의존하였다. 광학특성은 모든 감압성 점착제에서 92.5 % 이상의 광투과도 (at 550 nm), 1.0 % 이하의 haze값, 0.3 이하의 색차계값을 보임을 확인하였다. 결과적으로 가교제의 종류에 영향을 받지 않음을 확인하였다.

• 폴리머
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• 제26권5호
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• pp.653-660
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• 2002

가교제 poly(ethylene glycol) diacrylate (PEGDA)를 사용하여 제조한 poly(N-iso-propylacrylamide) (PNIPAAm) 및 poly (N-isopropylacrylamide-co-sodium methacrylate) (P(NIPAAm-co-SMA)) hydrogels의 부피 상전이 현상을 함수율과 표면적의 변화로 고찰하였다. Hydyogel의 부피 상전이 온도는 가교제의 농도에는 영향을 받지 않았으나 공단량체인 SMA의 소량 첨가로 4$0^{\circ}C$ 이상 상승하였다. 특히 PEGDA를 가교제로 사용하였을 경우 가교 길이가 길어짐에 따라 부피 상전이 온도가 더 높게 상승하였다. PNIPAAm 및 P(NIPAAm-co-SMA) hydrogels의 표면적 역시 부피 상전이 온도를 전후하여 감소하였는데 이는 부피 상전이 과정에서 기공의 크기가 현저하게 감소하였기 때문이다. 따라서 표면적과 기공 크기의 변화가 부피 상전이를 나타내는 주요한 인자임을 알 수 있다.

• 한국인쇄학회지
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• 제12권1호
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• pp.81.2-98
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• 1994

This syudy analyzed the main bodies, marginal space, Position of the main bodies of current textbooks in high schools and "the eriteria of reading system for textbooks" which was suggested the Department of Education and Provided some suggestions for the improvement. The research methods used for the study were both literature review and survey rdsdarch with a questionaire. Inorder to research for the main body of textbook, space of margin, the optimum position of the main body, sizes of litters, spaces between letters, words, lines, length of lines, sizes of main body and margin, and margin and position of main body were checked through a related literature review. For the questionaire experiment, a questionaire based on data drawn from analysis of current textbooks, :criteria for reading system of textbook" suggested by the Department of Education, and some suggestions for improvement by the researcher was made and used for the test, targetting 384 body and girl student in high schools.n high schools.