• 대한가정학회지
• /
• 제11권3호
• /
• pp.285-298
• /
• 1973

The colorfastness of dying persipiration and laundry on summer clothing must be considered, because it has special relation to the human body. The colors of fibers as cotton, p/c, acryl, polyester and nylon which have been widely used for blouse and T-Shirt of Knitted wear are R-P, Y-G, BI-B and print. Studies were carried out with persipirometer, for the natural fiber of cotton the chemical one of nylon, with additional stuff involved, which polluted. The experiment was conducted to colorfastness with acid solution and alkaline solution to see the alteration of color and staining of man-made persiperation. The results obtained from this experiment can be summerized as follows. 1. The order of color alteration isnylon < p/c < coton < polyester < acryl, and the nylon shows the lowest colorfastness, which is 3 class, and the acrly shows the highest colorfateness, which is 5 class. The staining of multifiber test of cotton fabric is nylon < p/c < polyester < cotton < acryl. The staining of multifiber of nylon fabric is nylon polyester < p/c < cotton < acryl. 2. In acid solution and alkaline solution, the alteration of color and staining makes almost no difference, but concerning staining of cotton, the acid solution is lower than the case of alteration solution only. 3. In the pollution on cotton and nylon, the latter is more easily polluted than the former regardless of fabrics. Especially in case of polluted nylon, ti shows the lowest color fastness (2 class), which causes a problem of the dying process and dye stuffs. 4. No difference of color alteration shows among them, but R-P and print show low color fastness (2 class), especially printed nylon shows the lowest value (1 class).

• 한국융합학회논문지
• /
• 제9권4호
• /
• pp.93-98
• /
• 2018

본 연구는 시력교정용 안경렌즈의 재질에 따른 자외선 차단 성능을 확인하고자 하였다. 안경렌즈 Acryl, CR-39, NK-55, MR-8 재질의 렌즈에 대하여 흠집 방지와 반사방지 코팅을 한 렌즈 Group A와 여기에 자외선 차단 코팅을 추가한 렌즈 Group B, 그리고 자외선 차단 전용렌즈 Group C에 대하여 자외선 투과율을 측정하였다. 그 결과, UV-A 파장에서 Group A는 CR-39 렌즈가 7.726 %, NK-55 렌즈, 0.043 %, MR-8과 Acryl 렌즈, 0.007 % 순 이었으며 Group B는 CR-39 렌즈가 0.038 %, NK-55 렌즈, 0.037 %, MR-8과 Acryl 렌즈, 0.007 % 순으로 나타나 CR-39 렌즈의 자외선 차단 성능이 크게 개선되었다. Group C는 굴절률이 1.60과 1.67에서 각각 0.005 %, 0.004 %로 나타나 자외선 차단 성능이 가장 우수하였다. 저 도수의 렌즈와 썬글라스의 경우, CR-39 렌즈를 가장 많이 사용하는 현실에서 자외선 차단을 위한 새로운 재질 또는 자외선 흡수제, 자외선 차단코팅 기술 등의 융 복합적 기술개발이 요구된다고 하겠다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
• /
• pp.449-452
• /
• 2008

철근 콘크리트 구조는 철근과 콘크리트의 상호보완적으로 구성된 우수한 구조체이다. 그러나 구조적 균열 및 비구조적 균열과 같은 여러 원인들로 균열의 발생은 피할 수 없다. 이렇게 발생된 균열은 내구성, 안전성, 기능 및 미관 등 손상을 초래하기 때문에 보수가 필요하다. 다양하게 개발된 균열보수공법은 균열의 형태에 따라 공법의 선택이 달라진다. 그 중 균열주입공법은 구조체의 변형을 극소화하는 공법으로 범용적으로 사용되고 있다. 그러나 주입공법에 사용되는 기존 주입보수액은 성능과 환경적 측면에서 만족할만한 성능을 가지지 못하기 때문에 많은 연구가 진행되고 있는 실정이다. 이에 본 연구는 친환경 재료로써 균열주입재로 사용되는 아크릴 겔의 신속한 성능 발휘를 검토하기위한 방법으로 실험을 실시하였다. 실험결과 촉매제의 첨가량이 증가할수록 아크릴 겔의 겔화시간이 줄어드는 결과가 나타났으며, 연구의 결과는 아크릴 겔을 사용하는 균열주입 보수공법의 기초적 자료로 사용될 것이다.

• Bulletin of the Korean Chemical Society
• /
• 제28권10호
• /
• pp.1651-1655
• /
• 2007

Rod-like polymerizable LC molecules having two different reactive groups, i.e. acryl and diacetylene groups were prepared. 4-Hydroxyphenyldiacetylenes were synthesized by the coupling reaction of 1-bromoalkynes with 4-ethynylphenol and then reacted with 4-(6-acryloyloxyalkyloxy)benzoic acid to give polymerizable LC molecules 4a-d. The mesomorphic properties of compounds 4a-d were investigated by differential scanning calorimetry, polarized optical microscopy and X-ray diffractometry. Compounds 4a-c exhibited smectic and nematic phases, but compound 4d having a longest alkyl tail among the series formed only a smectic phase. Photopolymerizability of acryl and diacetylene groups was investigated by IR spectroscopy. An anisotropic polymer film could be prepared by selective polymerization of acryl groups with 365 nm UV light in the presence of a photoinitiator (2,2-dimethoxy-2-phenylacetophenone). The subsequent reaction of diacetylene groups with 254 nm UV light disrupted the anisotropic structure, suggesting that these LC molecules could be used for imaging on the film.

• 한국가구학회지
• /
• 제10권1호
• /
• pp.65-71
• /
• 1999

The bending performance of sloped finger-jointed Rhus verniciflua were tested in order to improve the strength properties of finger-joint. Sloped finger-cut pieces were jointed with three kinds of adhesives (polyvinyl acetate, polyvinyl-acryl acetate and oilic resin). The slope ratios of finger joints were 0, 1.0, 1.5, and 2.0. The MOE, MOR and deflection to maximum load in bending of sloped finger-joints and solid wood specimen were measured. The results were : 1) The efficiencies of MOE to finger and sloped finger-joints to the solid wood were almost same in the three kinds of adhesives(polyvinyl acetate, polyvinyl-acryl acetate and oilic urethane resin) and there were some effect of slope on the MOE in a sloped finger-joint for three kinds of resin adhesives. 2) There was the effect of slope on the MOR in sloped finger-joints in every kind of adhesive. The efficiencies of MOR in slope ratios of 0 and 2.0 ranged 65-79%, respectively. There was also a slight effect of the kinds of adhesives on the MOR. However, the efficiencies of deflection to the urethane resin adhesive were much less than those of polyvinyl acetate, polyvinyl-acryl acetate resin adhesives except the slope ratio of 0. 3) It might be impossible to estimate the bending stregth of sloped finger-jointed Rhus verniciflua by using MOE. The correlation coefficient(0.192) between MOE was very low and not significant at 5% level.

• 공업화학
• /
• 제16권1호
• /
• pp.39-44
• /
• 2005

본 연구에서는 HDI (hexamethylene diisocyanate)와 IPDI (isophorone diisocyanate), Polyol, 2-HEMA (2-hydroxy ethyl-methacrylate), n-BA (n-butyl acrylate) 그리고 MMA (methylmethacrylate)을 사용하여 폴리우레탄-아크릴 공중합 에멀젼 수지를 합성하였다. 또한 폴리올의 종류가 폴리우레탄-아크릴 에멀젼 수지의 제조 방법과 강도 및 내수성 등의 물성에 미치는 영향을 살펴 보았고 이를 아크릴 에멀젼 수지와 비교해 보았다. 실험 결과 폴리에스테르형 폴리올이 폴리에테르형 폴리올이나 아크릴 에멀젼보다 인장강도와 내수성 면에서 더 우수함을 보였다.

• 한국가구학회지
• /
• 제10권2호
• /
• pp.73-78
• /
• 1999

This paper describes the relationship between the bending strength properties of sloped finger-jointed woods and the acoustic emissions(AEs) generated during the test. Rhus verniciflua pieces were cut in sloped-finger types and glued with three kinds of adhesives(polyvinyl acetate, polyvinyl-acryl acetate and oilic urethane resin). The slope ratios of finger joints were 0, 1.0, 1.5, and 2.0. The AE cumulative event count and cumulative count were measured during the bending test. The results were as follows: The lower the bending strength(load) was, the generation time of AE event count got and the higher the increasing rate of AE event count became in the sloped finger-jointed specimens bonded with polyvinyl acetate, polyvinyl-acryl acetate oilic urethane resin adhesives. Therefore, the slope from load-AE cumulative event count was very steep. The patterns of AE event count and count were very similar. The relationship between the MOR and the AE parameter from load and AE cumulatve event count in the early stage of the sloped finger-jointed specimens bonded with polyvinyl acetate, polyvinyl-acryl and oilic urethane resin adhesives was much greater than that between the MOE and the MOR. Therefore, the AE signals obtained during bending test are useful for estimating the strength of sloped finger-jointed Rhus verniciflua specimens.

• Elastomers and Composites
• /
• 제35권3호
• /
• pp.196-204
• /
• 2000

방수제로 사용하는 EVA 에멀젼 수지에 라텍스 형태의 아크릴 수지, 에폭시 수지, 우레탄 수지, SBR 수지를 전체 혼합물 중에 $0{\sim}50%$ 혼합하여 소포성, 기계적 물성, 내수성 등을 조사하였다. 소포제의 소포효과는 BYK-021이 가장 우수하였으며 적절한 사용량은 전체 혼합물에 대하여 0.3phr이었다. 수축율은 수지간의 상용성과 기공형성도에 영향을 받았으며 기계적 강도는 수지 분자간의 응집력, 수지와 시멘트의 결합력, 시멘트 입자간의 응집력 등에 영향을 받았다. 라텍스를 혼합한 것은 혼합하지 않은 것보다 수축율, 굴곡강도, 접착강도, 충격강도 등에서 우수한 물성을 나타내었다. EVA에 시멘트를 혼합했을 때에는 혼합하지 않았을 때보다 내수성이 떨어졌다.

• 대한방사선기술학회지:방사선기술과학
• /
• 제21권2호
• /
• pp.36-42
• /
• 1998

Treatment of a large diseased area with electron often requires the use of two or more adjoining fields. In such cases, not only electron beam divergence and lateral scattering but also fields overlapping and separation may lead to significant dose inhomogeneities(${\pm}20%$) at the region of junction of fields. In this study, we made Acrylic Electron Wedges to improve dose inhomogeneities(${\pm}5%$) in these junction areas and to apply it to clinical practices. All measurements were made using 6, 9, 12, 16, 20 MeV Electron beams from a linear accelerator for a $10{\times}10\;cm$ field at 100cm of SSD. Adding a 1 mm sheet of acryl gradually from 1 mm to 15 mm acquires central axis depth dose beam profile and isodose curves in water phantom. As a result, for all energies, the practical range was reduced by approximately the same distance according to the acryl insert, e.g. a 1 mm thick acryl insert reduces the practical range by approximately 1 mm. For every mm thickness of acryl inserted, the beam energy was reduced to approximately 0.2 MeV. These effects were almost Independent of beam energy and field size. The use of Acrylic Electron Wedges produced a small increase(less than 3%) in the surface dose and a small increase(less than 1%) in X-ray contamination. For acryl inserts, thickness of 3 mm or greater, the penumbra width increased nearly linear for all energies and isodose curves near the beam edge were nearly parallel with the incident beam direction at the point of penumbra width($35\;mm{\sim}40\;mm$). We decide heel thickness and angle of the wedge at this point. These data provide the information necessary to design Acrylic Electron Wedge which can be used to improve dose uniformity at electron field junctions and it will be effectively applied to clinical practices.

• 폴리머
• /
• 제36권3호
• /
• pp.315-320
• /
• 2012

아크릴 공중합체의 구조와 다관능성 단량체의 관능성 및 함량을 조절하여 반도체 제조공정에 적합한 자외선 경화형 점착제를 제조하였다. 아크릴 공중합체는 점착력을 부여하는 기본수지로 사용되었고 다관능성 단량체는 광가교 특성으로 인하여 3차원 가교구조와 가교밀도를 변화시키기 위해 사용하였다. 아크릴 공중합체는 단량체 조성에서 2-ethylhexyl acrylate의 함량이 감소할수록 자외선 조사 후의 박리 점착력이 감소하였다. 광경화 특성을 갖는 다관능성 단량체의 탄소 이중결합 관능성이 증가할수록 자외선 조사 후 가교밀도가 증가하여 박리 점착력이 감소하였고 박리 후 웨이퍼 표면에 남게 되는 점착제 잔사물도 크게 감소하였다. 6관능성 단량체를 20 phr 포함하는 광가교형 감압점착제가 자외선 조사 전 점착력이 높고, 자외선 조사 후 박리 점착력이 낮고, 박리 후 웨이퍼 표면에 남게 되는 점착제 잔사물이 가장 적었다.