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폴리머 - 콘크리트 복합재료 개발 (Ⅰ) - 폴리머 - 시멘트 콘크리트의 물성 -
황의환,길덕수,오인석 ( Eui Hwan Hwang,Deog Soo Kil,In Seok Oh ) 한국공업화학회 1997 공업화학 Vol.8 No.6
폴리머 혼화제로서 styrene-butadiene rubber(SBR)라텍스, ethylene-vinyl acetate(EVA)에멀젼 및 polyacrylic ester(PAE)에멀젼을 사용하여 동일한 스럼프에서 폴리머-시멘트비를 변화시켜 공시체를 제조하여, 압축과 휨강도시험, 흡수시험, 세공분포측정 및 미세구조 관찰등을 실시하였다. 그 결과 폴리머-시멘트비의 증가와 더불어 압축과 휨강도 모두 향상되었고, 동해에 큰 영향을 주는 모세관 공극범위의 세공량은 감소되었으며, 폴리머 시멘트비 l5wt% 이상에서 연속적인 폴리머필름이 형성되었다. Test specimens of polymer-cement concrete composites were prepared using styrene-butadiene rubber(SBR) latex, ethylenevinyl acetate(EVA) and polyacrylic ester(PAE) emulsions as polymer dispersions in cement modified system at constant slump(10±0.5cm), then compressive and flexural strengths water absorption, pore size distribution, and microstructures were investigated. Compressive and flexural strengths of these composites were remarkably improved with an increase of polymer-cement ratio. These composites had a desirable pore size distribution against frost damage due to a small capillary pore volume. Continuous polymer film was able to form in higher than 15% of polymer-cement ratio.
콘크리트-폴리머 복합재료 개발(II) -폴리머(레진) 콘크리트의 물성-
황의환,황택성,길덕수,Hwang, Eui-Hwan,Hwang, Taek-Sung,Kil, Deog-Soo 한국공업화학회 1999 공업화학 Vol.10 No.7
고기능성 건설재료로 활용하기 위하여 불포화폴리에스테르수지를 사용한 폴리머 콘크리트의 물성에 대하여 조사하였다. 탄산칼슘(충전제)의 첨가량(5~20 wt %)과 세골재의 첨가량(10~50 wt %)에 따라 다양한 배합의 공시체를 제작하여 압축 및 휨강도, 흡수시험, 내열수성시험, 내산성시험, 세공분포측정 및 SEM에 의한 미세조직 관찰등을 실시하였다. 그 결과 폴리머 콘크리트의 압축강도와 휨강도는 시멘트 콘크리트보다 4배 정도 향상되었고, 흡수율은 1/100로 감소되었으며, 내산성시험에 의한 중량감소율은 1/27로 현저히 감소되었다. 내열수성시험후에 측정한 폴리머 콘크리트의 압축 및 휨강도는 모두 내열수성시험전에 측정한 강도에 비하여 67%, 47%로 각각 감소되었으며 폴리머결합재의 분해에 의하여 세공량과 세공율은 크게 증가되었다. The physical properties of polymer concrete were investigated for development of high-performance construction materials. Various specimens of polymer concrete were prepared using unsaturated polyester resin as the polymer-binder with the various dosage of calcium carbonate as microfiller (5~20 wt %) and fine aggregate(10~50 wt %). For the evaluation of the physical properties of polymer concretes, tests such as compressive strength, flexural strength, water absorption test, hot water immersion test, acid resistance test and pore size distribution analysis were conducted. As a result, it is concluded that compressive and flexural strengths of polymer concretes increased up to 4 times than those of conventional cement concrete. Whereas the compressive and flexural strengths of polymer concretes tested after hot water immersion, compared with those of polymer concretes tested before hot water immersion, decreased about 67%, 47%, respectively. By hot water immersion, total pore volume and porosity(%) of polymer concretes were remarkable increased due to decomposition of polymer binder. And also, it is showed that water absorption(%) and weight loss(%) of polymer concrete specimens by acid immersion, compared with those of ordinary portland cement concrete, decreased about 1/100, 1/27, respectively.
Imide 단위를 포함하는 Polyamide의 합성과 열적 성질
길덕수,배장순,공명선 단국대학교 신소재기술연구소 1997 신소재 Vol.7 No.-
Imide 단위를 포함하는 diamine과 dicarboxylic acid 단량체들, N-(4-aminophenyl)-4-aminophthalimide(1), N-(4-carboxyphenyl)-4-carboxyphthalimide(2), N,N'-oxydiphenylenebis(4-aminophthalimide)(3) 및 N,N'-oxydiphenylenebis(4-carboxyphthalimide)(4)를 합성하였다. 위의 단량체들은 서로 축합하여 imide 단위가 교대된 poly(imide-amide)s를 합성하였으며 imide 단위를 포함하는 diamine 단량체들은 terephthaloyl chloride, isphthaloyl chloride와 축합하여 또다른 poly(imideamide)s를 합성하였다. 이렇게 합성된 중합체들은 NMP/LiCl 용액에 매우 잘 용해하였으나 그밖에 극성 반양자성 용매인 DMF, DMSO 및 DMAc 등에는 낮은 용해도를 보여주었다. 고유 점성도는 0.15-0.51 dL/g 이었으며 NMP/LiCl 용액으로부터 단단하지만 취성이 있는 고체막이 형성되었다. 중합체들의 유리전이온도 및 융점은 관찰되지 않았으나 400℃ 부근에서 서서히 분해가 시작되었으며, 중합체들은 500℃에서 82-93%의 잔사량을 나타내어 우수한 열적성질을 보여주었다. Diamine and dicarboxylic monomers with imide linkage, N-(4-aminophenyl)-4-aminophthalimide(1), N-(4-carboxyphenyl)-4-carboxyphthalimide (2), N,N'-oxydiphenylenebis (4-aminophthalimide)(3) and N,N'-oxydiphenylenebis (4-carboxyphthalimide) (4) were prepared, and poly(amide-imide)s with ease processing characteristics were prepared from the monomers, 1-4 and terephthaloyl chloride or isophthaloyl chloride. Intrinsic viscosity of polymers was 0.15-0.51 dL/g and brittle hare films were obtained by casting the NMP/LiCl polymer solution on to glass plate. The poly (amide-imide)s are easily solubiel in NMP/LiCl and also in polar aprotic solvents such as DMF, DMSO, NMP and DMAc at 80℃. These polymers showed no glass transition temperature and melting temperature in their DSC thermograms. All the polymers decomposed at around 400℃ and 500℃ in nitrogen and had 88∼93% residual weight at 500℃.
崔乘載,吉德洙,趙壬元 단국대학교 1995 論文集 Vol.29 No.-
The graft ploymerization of methyl methacrylate onto starch initiated by ceric ammonium nitrate. The grafted polymer was identified by using IR spectroscopy. Four copolymer samples with grafting percents of 34.29%, 48.71%, 57.89% and 67.89% were tested for their microbial susceptibility in a synthetic medium employing a inoculum of aspergillus niger, trichoderma viride. Starch-g-poly(methyl methacrylate)copolymer films show excellent susceptibility to fungal growth, some samples losing more than 14% of their weight after 15days of incubation with aspergillus niger. There was initial rapid weight loss accompanied by the exponential increase in bacterial population and pH of the culture medium during the second week. The extent of degradation seems to decress with increasing grafting percent.
폐FRP 미분말을 재활용한 PAE 폴리머 모르타르의 물리적 특성
황의환,길덕수,노재성,이병기 공주대학교 자원재활용 신소재 연구센터 2002 센터사업 성과집 Vol.- No.1
In order to recycle the FRP wastes from SMC bathtubes, polymer-modified mortars containing a fine powder of fiber-rainforced plastics(FRP) as a part of the sand were prepared with various FRP replacements for sand and polymer cement rations. The polymer modifier used was polyacrylic ester(PAE) emulsion. The FRP waste fine powder was obtained by pulverizing FRP wastes. The water-cement ratio, compressive and flexural strength, water absorption and hot water immersion of the mortar were tested and the results compared to those of ordinary cement mortal and polymer-cement mortal. As the results, compressive and flexural strengths of ordinary portland cement mortars containing FRP wastes fine powder were remarkably decreased with an increase of a content of FRP wastes fine powder. But those strengths of ordinary portland cement mortars were greatly improved by adding PAE emulsion. When the replacement ratios of FRP wastes fine powder and adding rations of PAE emulsion were 5, 10, 20wt% and fine powder were showed as much those strengths of ordinary portland cement mortar. Otherwise heat curing of PAE-modified mortar containing FRP wastes fine powder accelerated the improvement of early compressive and flexural strengths. But the compressive and flexural strengths of PAE-modified mortar containing FRP wastes fine powder were remarkably decreased after hot water immersion test.