• 대한화학회지
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• 제54권6호
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• pp.761-765
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• 2010

Poly (N,N-dimethylacrylamide)는 수용성과 생체적합성이 뛰어나 다양한 분야에서 매우 유용하게 사용되고 있다. 본 연구는 N,N-dimethylacrylamide를 교차결합제인 EGDMA (ethylene glycol dimethacrylate)와 HEMA (2-hydroxyethyl methacrylate), MMA (methyl methacrylate), NVP (N-vinyl-2-pyrrolidone) 그리고 개시제인 AIBN (azobisisobutyronitrile)과 함께 공중합 하였다. 생성된 고분자의 물리적 특성을 측정한 결과, 함수율 36 - 42%, 굴절률 1.433 - 1.426, 가시광선 투과율 90 - 91%, 산소전달율 13.1 - $21.29{\times}10^{-11}(cm^2/sec)$ ($mlO_2/mL{\times}mmHg$) 범위의 분포를 나타내었다. 또한 polarographic method에 의한 공중합체의 산소전달율을 측정한 결과 N,N-dimethylacrylamide의 함량이 증가할수록 11.0% - 80.5% 증가한 결과를 보였다. 본 실험결과로 볼 때 생성된 공중합체는 고산소투과성을 지닌 하이드로젤 렌즈 재료로 사용될 수 있을 것으로 판단된다.

• 대한화학회지
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• 제62권2호
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• pp.113-117
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• 2018

The basic hydrogel lens with addition of N,N-dimethylacrylamide (DMA) and N-methyl-N-vinylacetamide (NMV) were manufactured. The optical and physical characteristics of ophthalmic lens were evaluated by measuring water content, oxygen permeability (Dk), refractive index and optical transmittance. The water content & oxygen permeability (Dk) of sample containing Ref., DMA group and NMV group was in the average of 34.48%, 35.54~49.19% & $13.003{\sim}18.468{\times}10^{-11}(cm^2/sec)$($mlO_2/ml{\times}mmHg$) and 36.28~44.95% & $12.270{\sim}16.883{\times}10^{-11}(cm^2/sec)$ ($mlO_2/ml{\times}mmHg$), respectively. And also, refractive index of the sample containing Ref., DMA group and NMV group was in the average of 1.4350, 1.4330~1.4131 and 1.4335~1.4195, respectively. Standard hydrogel monomer containing DMA and NMV was expected to be used usefully as a material for fabricating hydrophilic functional ophthalmic lens.

• Advances in environmental research
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• 제2권4호
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• pp.309-321
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• 2013

High AA new high capacity sorbent for preconcentration and determination of nickel in environmental samples was synthesized. The sorbent was synthesized by copolymerization of allyl glaycidyl ether / imminodiacetic acid with N,N-dimethylacrylamide as functional monomers in the presence of N,N-bismethylenacryl amid as cross linker and characterized by Fourier transform infra red spectroscopy, elemental analysis, thermogravimetric analysis and scanning electron microscopy. A recovery of 93.6% was obtained for the metal ion with 0.1 M, sulfuric acid as the eluting agent. The sorption capacity of the functionalized sorbent was 55.9 $mgg^{-1}$. The equilibrium sorption data of Ni(II) on polymeric sorbent were analyzed using Langmuir, Freundlich, Temkin and Redlich.Peterson models. Based on equilibrium adsorption data the Langmuir, Freundlich and Temkin constants were determined 0.87 (L mg-1), 25.87 ($mgg^{-1}$) $(Lmg^{-1})^{1/n}$ and 171.4 ($Jmol^{-1}$) respectively at pH 4.5 and $20^{\circ}C$.

• 한국안전학회지
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• 제19권3호
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• pp.57-64
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• 2004

This is the study for the removal of a toxic heavy metal ions and the recycling of expanded polystyrene wastes. Thus expanded polystyrene wastes collected from the packing materials of TV or chemicals and dissolved by $80wt.\%$ solvent(N, N-Dimethylacrylamide), electrospun in DC 20kV by power supply. Generally, the electrospinning is a process of manufacture to the fibers of nanosize from polymer solution. Manufactured nanofiber mats by electrospinning were sulfonated by cone.-sulphuric acid with $Ag_2S_O_4$ catalysts for the exchange capacity of heavy metal ions and the properties of structure with sulfonated time investigated by FESEM(Feild Emission Scaning Electron Microscope). The ion exchange capacity of light metal$(Na^+)$, Cd(II) and Ni(II), and by a nanofiber mats were 1.94[mmo1/g-dry-mat), 1.72(mmol/g-dry-mat), 1.24(mmol/g-dry-mat), respectively., and water uptake content showed a similar trend with IEC. and The selectivity coefficients $K^M_H$ of Cd(II), Ni((II) ions showed 0.324, 0.228. respectively.

• 한국재료학회지
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• 제29권7호
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• pp.399-407
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• 2019

This research is carried out to analyze the effects of Styrene and PVP on the properties of silicone hydrogel lenses. Styrene group and PVP(Polyvinylpyrrolidone) are used as additives for a basic combination containing silicone monomer, TSMA(trimethylsilyl methacrylate) and DMA(n,n-dimethylacrylamide) added to the mix at ratios of 1~10 %. Silicone hydrogel lens is produced by cast-mold method. The polymerized lens sample is hydrated in a 0.9 % saline solution for 24 hours before its optical and physical characteristics are measured. Measurement of the physical characteristics of the produced material shows that the refractive index is 1.3682~1.4321, water content 77.11~45.73 %, visible light transmittance 95.14~88.20 %, and tensile strength 0.0652~0.3113 kgf. The results show a decrease of refractive index as the ratio of additives and water content decreases. The result of the stabilization test of polymerization show an increase of extractables along with increase of the ratio of additives, but the difference is not significant for all samples, so it can be judged that the stabilization of the polymer is maintained. Therefore, the additions of styrene and PVP should be taken into consideration for their effects on the physical properties of silicone hydrogel lens.

• Korean Chemical Engineering Research
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• 제49권3호
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• pp.352-356
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• 2011

리빙 프리 라디칼 중합법은 ATRP, NMP, RAFT 등의 방법이 있으며, 지난 수 십년간 매우 빠르게 발전해 왔다. 그 중에서 RAFT 중합법은 다른 방법들에 비해 최근에 학문적으로 크게 주목 받고 있다. RAFT 중합법은 다른 리빙 프리 라디칼 중합법에 합성할 수 있는 단량체의 종류나 합성의 제한이 비교적 작아서, 다양한 기능성 고분자를 쉽게 중합할 수 있으며, 합성한 고분자의 분자량 분포 또한 좁게 만들 수 있는 장점이 있다. 따라서 RAFT 중합법을 통해 다양한 형태의 블록 공중합체, 댄드리머 등을 합성하는데 이용되고 있다. 이 논문에서는 위와 같은 RAFT 중합법을 이용해, 친수성 블록을 갖는 새로운 블록 공중합체를 합성한다. Poly(ethylene-b-styrene)와 poly(ethylene-b-metharylate-bstyrene) 같은 블록 공중합체 박막을 이용해 용매 증발법에 의한 높은 수준의 정렬도를 갖는 연구가 진행, 보고되었다. 그리고 위의 2가지 연구에서 습도가 정렬도에 큰 영향을 미치는 것으로 보고되고 있다. 하지만 위의 연구에서 친수성 블록에 의한 영향을 명확하게 규명하지 못했다. 따라서 이 논문에서는 다른 친수성 블록을 갖는 poly(N,Ndimethylacrylamide-b-styrene)를 RAFT 중합법에 의해 합성하고, 이를 이용해 박막 내에서 용매 증발법 중의 습도에 의한 영향을 일반화하고자 한다.