• 제목, 요약, 키워드: super absorbent polymer

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고흡수성 수지를 이용한 흡수성 실리콘의 특성 연구 (Study on the Characteristics of the Absorbency Silicone by Super Absorbent Polymers)

  • 차국찬;송점식;이석민
    • Elastomers and Composites
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    • v.47 no.2
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    • pp.141-147
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    • 2012
  • 실리콘 수지는 소수성이 강한 고분자이기 때문에 수분을 흡수하는 기능이 전혀 없다. 하지만 고흡수성 수지(Super Absorbent Polymer)를 첨가제로 사용하면 기존의 실리콘보다 월등한 흡수성을 갖게 된다. 본 연구에서는 무정형 형태의 입자 크기가 다른 아크릴계 고흡수성 수지 3가지를 선택하여 배합비를 설정하고 2액형 타입의 의료용 실리콘 소재에 적용해서 수분을 흡수하는 기능을 갖는 새로운 실리콘 소재를 개발하였다. 고흡수성 수지의 첨가에 의한 실리콘 수지의 제조시 입자 사이즈와 함량을 달리하면서 인장, 인열, 압축, 경도에 대한 기계적 물성 변화를 알아보았으며, 시간에 따른 실리콘 수지의 흡수성을 측정하였다. 또한 전자 현미경을 통해 고흡수성 수지의 입자형태와 실리콘 수지와의 분포도를 관찰하였다.

고흡수성고분자가 조핵제로 첨가된 빙축열용 축열재 개발 (An Evaluation of a super-absorbent polymer as the Nucleating Agent for a Capsule-type Ice Storage System)

  • 최형준;홍성안;박원훈
    • 태양에너지
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    • v.10 no.2
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    • pp.28-37
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    • 1990
  • 빙축열의 문제점인 물의 과냉각을 억제 또는 제거하기 위하여 고흡수성 고분자를 조핵제로 사용하는 방법이 고안되었다. 축열재인 물을 $25^{\circ}C$에서 $-12^{\circ}C$로 냉각시킨 결과 순수한 물의 경우 샘플중 25%의 샘플은 전혀 결빙되지 않았으며 나머지 얼음이 생성된 샘플의 경우도 평균 $9.8^{\circ}C$의 과냉각을 보인 반면, 조핵제가 첨가된 경우 35%가 전혀 과냉각을 보이지 않았으며 과냉각이 일어난 샘플의 평균과 냉각온도 역시 현저히 감소되었다. 0.5wt%의 고흡수성 고분자가 첨가된 축열재를 사용하여 캡슐타입으로 제작한 축열조에서 열전달 실험을 실시한 결과 과냉각은 전혀 관찰되지 않았으며 이로 인하여 순수물을 축열재로 사용하는 경우보다 축열속도가 증가하였다. 이상의 결과로부터 고흡수성 고분자가 빙축열 시스템의 조핵제로 사용될 수 있음을 확인하였다.

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Responses of Low-Quality Soil Microbial Community Structure and Activities to Application of a Mixed Material of Humic Acid, Biochar, and Super Absorbent Polymer

  • Li, Fangze;Men, Shuhui;Zhang, Shiwei;Huang, Juan;Puyang, Xuehua;Wu, Zhenqing;Huang, Zhanbin
    • Journal of Microbiology and Biotechnology
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    • v.30 no.9
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    • pp.1310-1320
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    • 2020
  • Low-quality soil for land reuse is a crucial problem in vegetation quality and especially to waste disposal sites in mining areas. It is necessary to find suitable materials to improve the soil quality and especially to increase soil microbial diversity and activity. In this study, pot experiments were conducted to investigate the effect of a mixed material of humic acid, super absorbent polymer and biochar on low-quality soil indexes and the microbial community response. The indexes included soil physicochemical properties and the corresponding plant growth. The results showed that the mixed material could improve chemical properties and physical structure of soil by increasing the bulk density, porosity, macro aggregate, and promote the mineralization of nutrient elements in soil. The best performance was achieved by adding 3 g·kg-1 super absorbent polymer, 3 g·kg-1 humic acid, and 10 g·kg-1 biochar to soil with plant total nitrogen, dry weight and height increased by 85.18%, 266.41% and 74.06%, respectively. Physicochemical properties caused changes in soil microbial diversity. Acidobacteria, Bacteroidetes, Chloroflexi, Cyanobacteria, Firmicutes, Nitrospirae, Planctomycetes, and Proteobacteria were significantly positively correlated with most of the physical, chemical and plant indicators. Actinobacteria and Armatimonadetes were significantly negatively correlated with most measurement factors. Therefore, this study can contribute to improving the understanding of low-quality soil and how it affects soil microbial functions and sustainability.

Poly(sodium acrylate-co-acrylamide-co-2-hydroxyethyl acrylate)의 제조와 고흡수 특성 (Preparation and Super-Water-Absorbency of Poly(sodium acrylate-co-acrylamide-co-2-hydroxyethyl acrylate))

  • Zhang Yuhong;Deng Min;He Peixin
    • 폴리머
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    • v.30 no.4
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    • pp.286-292
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    • 2006
  • Super water-absorbent resins were prepared by inverse suspension copolymerization of sodium acrylate, acrylamide and 2-hydroxyethyl acrylate using N, N'-methylene-bis-acrylamide as cross-linker. For the suspension copolymerization, monohexadecyl phosphate was employed as the dispersing agent, cyclohexane as the dispersing medium and potassium persulfate as the initiator. The dependence of water-absorption capacity on the amount of crosslinking agent, oil/water ratio, degree of neutralization and the composition of the copolymer were systematically investigated. Furthermore, the swelling kinetics of the super water-absorbent copolymer was carried out. The absorption of the resins is more than 1800 g/g for deionized water and 100 g/g for 0.9% NaCl solution, respectively. The copolymers showed an increased salt resistance and enhanced water retention of soil.

식용버섯 재배시 초고흡수성 폴리머의 효과 (Application of Super Water Absorbent for Edible Mushroom Production)

  • 김명곤;윤숙;문성필;김형무;장태복;홍재식
    • 한국균학회지
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    • v.28 no.1
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    • pp.16-21
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    • 2000
  • 식용버섯 인공재배시 수분조정제로 아크릴아미드와 아릴설폰산염의 공중합물의 가수분해물인 CPAM-AS-hyd-1의 흡수겔을 첨가하여 각종 식용버섯의 균사생장 및 자실체 수량에 영향을 살펴본 결과 배지 100cc에 200g까지의 첨가는 균사생장에 큰 영향을 미치지 많았다. 식용버섯 생산을 위한 흡수겔의 적정 농도는 배지 100 cc에 대하여 느타리버섯의 경우는 200 g, 노루궁뎅이버섯은 $200{\sim}250\;g$, 팽이버섯은 200 g 첨가시 양호하였으며, 팽이버섯 재배시 폴리머 흡수겔과 10%(v/v)의 평화왕겨 첨가가 수량증대에 효과적이었다.

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Swelling Behavior of Biodegradable Crosslinked Gel based on Poly(aspartic acid) and PEG-diepoxide

  • Min, Suk-Kee;Kim, Ji-Heung;Chung, Dong-Jun
    • Macromolecular Research
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    • v.9 no.3
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    • pp.143-149
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    • 2001
  • Poly(aspartic acid), PASP, is a biodegradable, water-soluble polymer and offers a biodegradable alternative to polycarboxylates and other non-degradable water-soluble polymers. PASP one of poly (amino acid)s, possesses carboxylic acid pendant group in its repeating unit, which can be used for various further modification purposes. In this study we prepared high molecular weight polysuccinimide, as the precursor polymer for PASP, by thermal polycondensation ofL-aspartic acid in the presence of phosphoric acid. The polysuccinimide was hydrolyzed with 0.1 N sodium hydroxide, and then acidified to give PASP. High water-absorbent gels were produced by thermal crosslinking of freeze-dried mixture of partially-neutralized PASP and different amount of low moi. wt. PEG-diepoxide compounds in aqueous medium. The swelling behavior of the prepared gels from different size and composition of crosslinking reagent in different media was investigated and the results were discussed. This PASP-based hydrogel materials possessing inherent biodegradability, potential non-toxicity and biocompatibility, is expected to be used as a substrate for various biomedical applications as well as a general purpose super-absorbent polymer.

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고 흡수성 수지 첨가가 증류수의 과냉각 및 열적 특성에 미치는 영향 (Effects of Super Absorbent Polymer Addition on the Supercooling and Thermal Properties of Distilled Water)

  • 이석준;장정익;김진혁;이명규;박설현
    • 공학기술논문지
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    • v.11 no.3
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    • pp.171-176
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    • 2018
  • This paper investigated the thermal properties of phase change materials (PCMs) prepared by adding a super absorbent polymer (SAP) to distilled water. The thermal properties of PCMs were investigated using differential scanning calorimeter (DSC) and T-history methods. It was found that 0.1 g SAP addition to distilled water resulted in the best PCM in terms of its thermal properties. The experimental results obtained from the DSC analysis showed that the addition of SAP to distilled water lowered the latent heat from 11.2 J/g to 17.2 J/g. However, the phase separation characteristics which are typically observed for water-based PCMs were found to be improved by adding the SAP. Similar behaviors were observed in results determined from the T-history method. Additionally, the T-history method clearly demonstrated that adding the SAP to distilled water improved the supercooling temperature, shortening the liquid retention time. Despite reductions in the latent heat of PCM with the SAP addition, it is expected that the operating cost of the cooling system can be further reduced due to its improved phase change characteristics such as phase separation and supercooling temperature when the PCM with the 0.1 g SAP added is applied.

폴리아크릴아마이드를 기반으로 하는 다기능성 토양안정제의 특성에 관한 연구 (Research on Characteristics of Multifunctional Soil Binder Based on Polyacrylamide)

  • 김진경;김대호;주상현;이명천
    • 공업화학
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    • v.29 no.2
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    • pp.155-161
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    • 2018
  • 훼손된 비탈면을 효율적으로 복구하고 토양을 견고하게 지지하고 식물 생장을 도울 수 있는 토양바인더 사용이 매우 중요하다고 할 수 있다. 이러한 토양바인더는 토양을 오염시키지 않는 친환경 소재이면서 토양의 생태를 복원할 수 있어야 한다. 본 연구에서는 토양바인더 외에 흡수제와 응집제를 첨가하여, 최적의 함수율, 투수계수, 직접전단강도 값을 갖는 조건을 도출하였다. 토양바인더로는 다양한 음이온강도의 polyacrylamide (PAM)를, 흡수제로는 super absorbent polymer (SAP), 응집제로는 cellulose ether (CE)를 사용하여 그 효과를 관찰하였다. 그 결과 우선 토양바인더를 사용한 경우 토양시험편의 직접전단강도와 함수율을 각각 수십 배 이상 그리고 두 배 이상 증가시킬 수 있었으며 변수위 투수계수를 낮춤으로 인해 방수의 효과가 증가함을 관찰되었다. 첨가제로서 SAP를 사용한 경우 그 효과를 더욱 높일 수 있었고 SAP의 응집력을 높이기 위해 첨가된 CE 역시 직접전단강도와 함수율을 높임을 관찰할 수 있었다.

A Super-Absorbent Polymer Combination Promotes Bacterial Aggressiveness Uncoupled from the Epiphytic Population

  • Lee, Bo-Young;Kim, Dal-Soo;Ryu, Choong-Min
    • The Plant Pathology Journal
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    • v.24 no.3
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    • pp.283-288
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    • 2008
  • Plant leaf surface is an important niche for diverse epiphytic microbes, including bacteria and fungi. Plant leaf surface plays a critical frontline defense against pathogen infections. The objective of our study was to evaluate the effectiveness of a starch-based super-absorbent polymer(SAP) combination, which enhances water potential and nutrient availability to plant leaves. We evaluated the effect of SAP on the maintenance of bacterial populations. In order to monitor bacterial populations in situ, a SAP mixture containing Pseudomonas syringae pv. tabaci that expressed recombinant green fluorescent protein(GFPuv) was spray-challenged onto whole leaves of Nicotiana benthamiana. The SAP combination treatment enhanced bacterial robustness, as indicated by disease severity and incidence. Unexpectedly, bacterial numbers were not significantly different between leaves treated with the SAP combination and those treated with water alone. Furthermore, young leaves treated with the SAP combination had more severe symptoms and a greater number of bacterial spots caused by primary and secondary infections compared to young leaves treated with the water control. In contrast, bacterial cell numbers did not statistically differ between the two groups, which indicated that measurement of viable GFP-based bacterial spots may provide a more sensitive methodology for assessing virulence of bacterial pathogens than methods that require dilution plating following maceration of bacterial-inoculated leaf tissue. Our study suggests that the SAP combination successfully increased bacterial aggressiveness, which could either be used to promote the ability of biological agents to control weedy plants or increase the robustness of saprophytic epiphytes against competition from potentially harmful microbes.