• Title, Summary, Keyword: absorbency

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Synthesis of Montmorillonite/Poly(acrylic acid-co-2-acrylamido-2-methyl-1-propane sulfonic acid) Superabsorbent Composite and the Study of its Adsorption

  • Zhu, Linhui;Zhang, Lili;Tang, Yaoji
    • Bulletin of the Korean Chemical Society
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    • v.33 no.5
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    • pp.1669-1674
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    • 2012
  • A novel superabsorbent composite was prepared by intercalation polymerization of acrylic acid (AA) and 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) in the presence of montmorillonite (MMT), using ammonium persulfate (APS) as an initiator and $N,N'$-methylenebisacrylamide (MBA) as a cross linker. The superabsorbent composite was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Maximum absorbency of the composite in distilled water and 0.9% sodium chloride solution was 722 and 108 g/g, respectively. The composite was used for removal of heavy metal ions from aqueous solutions. Maximum amount of adsorption for $Ni^{2+}$, $Cu^{2+}$ and $Pb^{2+}$ was 211.0, 159.6 and 1646.0 mg/g, respectively, and the adsorption was in accordance with both Langmuir and Freundlich model. The composite could be regenerated and reused in wastewater treatment.

Manufacture of Hanji Using Tencel Fiber (텐셀섬유를 활용한 한지의 제조)

  • 민춘기;조중연;신준섭;류운형
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.33 no.4
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    • pp.35-41
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    • 2001
  • A newly developed functional fiber for textile, Tencel, which is known to have some advantages over wood fiber such as fibrillation, absorbency and so on, was examined to see the possibility of a raw material for hanji. Hanji was manufactured by the conventional handmade method using Tencel of three different fiber lengths with three different levels of mixing ratio of Tencel and paper mullberry fiber, and their physical and calligraphic properties were evaluated and compared with one another. It was needed to develop more efficient beating methods than conventional one such as valley beating for Tencel to be used effectively as a raw material for hanji. It was found out by image analysis that the calligraphic properties of hanji could be improved by mixing of 10 to 20% of Tencel of relatively short-length fiber with paper mulberry.

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The Improvement of Experimental Method of Textiles, Home Economics in High School (고등학교 가정과목의 피복재료 실험 방법 개선)

  • 유복현;이전숙
    • Journal of Korean Home Economics Education Association
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    • v.7 no.1
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    • pp.1-10
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    • 1995
  • This study was intended to provide an improved method for testing textiles in high school. Four kinds of test subjects were selected and applied to the classes. Problems of the methods in the textbooks were corrected as follows: 1)Burning test: The number of specimen is reduced to 3 kinds of fibers(cotton, wool, and polyester) and recommends are given to make result by comparing with the burning characteris-tics of paper and hair. 2) Absorbency test: Test Method is changed to drop test. The result is recorded by measuring time required for the water drops absorbed to the specimen. 3) Wrinkle recovery test: A glass is provided instead of metal weight. The method of measuring angle which is made by the specimen is shown in figure. 4) Effects of Detergent: 0.2% of detergent solution is provided before class. The amount of oil and carbon black is specified. Students have generally agreed that the improved methods were better than those in the text-books after they made the above 4 recommendable experiments(p<.001)

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Effects of Polymerization Parameters on Absorption Properties of an Itaconic Acid-based Superabsorbent Hydrogel

  • Kim, Dong Hyun
    • Elastomers and Composites
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    • v.54 no.3
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    • pp.232-240
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    • 2019
  • A superabsorbent hydrogel (SAH) can absorb and retain water weighing more than a hundred times of their dry weight because of their three-dimensional hydrophilic structure. To fabricate an SAH, itaconic acid (IA) and vinyl sulfonic acid (VSA) were subjected to radical polymerization in an aqueous solution, wherein IA and VSA were neutralized, and then, a crosslinker and a thermal initiator were added in sequence. The structure of poly(IA-co-VSA) was characterized using attenuated total reflectance Fourier-transform infrared spectroscopy. We also studied the changes in the absorption properties of the SAH composites according to the polymerization temperature, degree of neutralization, type and content of the initiator used, and type and content of the crosslinker used. Thus, we could determine the effects of some synthetic factors on the absorption properties of the SAH.

Effect of Nonionic Surfactant Solutions on Wetting and Absorbency of Polyethylene Terephthalate(PET) Fabrics (Part II) -Surfactants Characteristics and Fabric Properties- (비이온계 계면활성제 수용액이 PET직물의 습윤특성에 미치는 영향 (제2보) -계면활성제와 직물의 특성-)

  • Kim, Chun-Hee
    • Journal of the Korean Society of Clothing and Textiles
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    • v.29 no.12
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    • pp.1546-1553
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    • 2005
  • The wetting behavior and liquid transport of nonionic surfactant solutions; Span 20 and Tween 20, 40, 60, 80, 21, 61, 81, 65 & 85: in polyethylene terephthalate(PET) fabrics are reported. Five different PET fabrics are used in this study. PET 1, 2 & 3 have different compactness in structure. PET 4 & 5 have similar physical properties to PET 2, however, PET 4 has heat set finish and PET 5 with rewetting agent. The wetting and water retention properties of PET fabrics are greatly improved by addition of nonionic surfactants. The aqueous liquid retention(W) vs. cosq and W vs. adhesion tension has positive linear relationship. Hydrophilic surfactants which have short hydrophobes and surfactants with unsaturated hydrophobe structures are more efffctive in improving the wetting properties of PET fabrics. PET fabric which has larger thread spacing shows greater value of water retention ratio(W/H) than PET fabric with smaller thread spacing if there are no surfactants present in the system, however, W/H values become very similar among these PET fabrics when the surfactants are added. If there are no surfactants present in the system, PET with heat set finish has smaller value and PET with rewetting agent has greater value of W/H than PET without finish even though the fabrics have the similar physical properties.

Photoprotective Effect and Antioxidative Activity from Different Organs of Morus Bombycis Koidzumi (부위별 산뽕나무의 광보호효과 및 항산화 활성)

  • Sa, Jae-Hoon;Jin, Ying-Shan;Shin, In-Cheol;Shim, Tae-Heum;Wang, Myeong-Hyeon
    • Korean Journal of Pharmacognosy
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    • v.35 no.3
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    • pp.207-214
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    • 2004
  • This study was investigated antioxidatve activity for the purpose of developing antioxidant from Morus bombycis Koidzumi. Antioxidant activities of four different organs of Morus bombycis Koidzumi such as fruit, leaf, stem, and root were examined by radical scavenging effect with 1,1-diphenyl-2-picrylhydrazyl (DPPH). 80% methanol extract from the stem showed strongly antioxidative activity and 80% Ethanol extracts from the root, stem, and fruit had high antioxidative activity among 24 samples tested. The 80% ethanol extract has strong absorbency at UVA region (350 nm). The ethyl acetate (EtOAc) fraction exhibited antioxidative activity with $IC_{50}$ of $15.0\;{\mu}g/ml$ similar to those of synthetic antioxidant, BHT The EtOAc fraction has a good absorbency property as synthetic filter. In the absorbance of various extracts, the 80% ethanol and ethyl acetate extracts from the root of Morus bombycis Koidzumi showed higher absorbancy at 285 nm. The ethyl acetate fraction from the root of Morus bombycis Koidzumi contained total phenolic compounds of 654.8 mg/100 g. These results indicate that phenolic compounds are the major was biological components in the root of morus bombycis Koidzumi extracts. Considering these biological activities, the extracts of Morus bombycis Koidzumi showed a possibility to be used as a new material for natural anti-oxidants and substitutes for synthetic UV sunscreen agents.

Studies on the Composition and Antioxidative Effect of Leaves form Korean Rosa davurica Pall. (한국산 생열귀나무(Rosa davurica Pall.) 잎의 성분 및 항산화 효과에 관한 연구)

  • 김준범;최승필;이득식;함승시
    • Korean Journal of Food Preservation
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    • v.11 no.1
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    • pp.106-110
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    • 2004
  • The objective of this study was carried out to investigate nutritional characteristics and biological activities effects of Korean leaf of Rosa davurica Pall. in vitro. They were extracted with methanol and then further fractionated to n-hexane, chloroform, ethyl-acetate, n-butanol and water from methanol extracts. Methods of the antigenotoxic used in this experiment were UVA/UVB absorption property and DPPH radical scavenge. The proximate compositions of leaves of Rosa dauvrica Pall were 67.5% of crude Moisture, 0.7% of crude fat, 6.8% of crude protein, 6.1% of crude ash, and 20.8% of crude fiber. The major minerals were K (1637.2 mg%), Ca (219.5 mg%), P (182.1 mg%), and Mg (135.1 mg%). Most of the fractions of methanol extract which leaves of Rosa dauvrica Pall. have strong absorbency at UVB region (308 nm) and UV A region (350nm). These fractions have a good absorbency property as synthetic filter and could be served as substitutes for synthetic UV sunscreen agents. All fractions (n-hexane, ethyl-acetate, n-butanol and water) from methanol extracts except chloroform fraction exhibited DPPH radical scavenging activity with IC$\_$50/ of 35.3, 6.0, 14.0, and 18.0 $\mu\textrm{g}$/mL.

Preparation and characterization of medical silk sponge (인체적용을 위한 실크 스펀지의 제조 및 특성)

  • Jo, You-Young;Kweon, HaeYong;Lee, Kwang-Gill;Yeo, Joo-Hong;Lee, Heui-Sam
    • Journal of Sericultural and Entomological Science
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    • v.51 no.1
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    • pp.68-72
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    • 2013
  • Fibroin and sericin are natural proteins obtained from cocoon and one of the spotlight materials for medical device. Medical device made of these proteins also has the advantage that this material is biodegradable in to amino acid. In this study, we prepared silk sponges using fibroin, sericin and additives. The characterizations of the silk sponges such as morphology, stability, and blood absorbency were observed. The structural stability of the silk sponge decreased significantly by increasing sericin contents. The effect on the concentrations of ethanol to induce crystallization was observed to be superior to 70% ethanol. Structural stability of silk sponges containing additives was very lower than those not containing additives. The blood absorbency of the silk sponges was found to be excellent, regardless of the composition of sericin and fibroin. The resilient power of these sponges was also very good, in spite of the repeated soaking and drying. Therefore, we expect that the silk sponges can be used medical supplies such as plastic implants and hemostatic cotton.

Subjective Sensation and Tactile Preference of Face Towel Fabrics by Pile Fiber Type and Laundering Time (세면용 타월의 파일섬유 종류와 세탁에 따른 주관적 감각과 촉감 선호도)

  • Na, Younhee;Seo, Sangwon;Choi, Jongmyoung
    • Science of Emotion and Sensibility
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    • v.21 no.2
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    • pp.89-100
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    • 2018
  • This study was performed to develop face towel fabrics that reflect consumer's tactile preferences. Three different kinds of pile fiber (100% cotton, 50% cotton/50% bamboo, 100% bamboo) of the towel fabrics were selected for the test. The towels were laundered one, five and 10 times repeatedly in a normal washing condition, and fabric softeners were applied to the towels that were laundered 10 times. The flexibility and absorbency (absorption rate and water absorptivity) were evaluated by laundering times of the face towels. Male and female university students evaluated their subjective sensations of the face towels. The flexibility of towel fabrics showed no significant difference according to type of pile fiber or laundering time. The absorbency of the towels was significantly different according to the type of pile fiber and laundering time. The absorption rate was higher in 100% bamboo fiber, and water absorptivity was higher for cotton fibers. There were no significant differences in subjective sensation according to the type of pile fiber of towels before laundering. As the frequency of laundering increased, the tactile preference for the towel slightly decreased. The 100% bamboo towel was rated the most comfortable among the three kinds of towels. The tactile preference for the towels was influenced by smoothness, fabric softness, and softener treatment, in that order.

Reactive Extrusion of Starch-g-Polyacrylonitrile in the Preparation of Absorbent Materials

  • Yoon, Kee-Jong;Carr, M.E.;Bagley, E.B.
    • Proceedings of the Korean Fiber Society Conference
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    • pp.8-8
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    • 1990
  • A new method for the graft polymerization of acrylonitrile onto starch is presented. Graft polymerization of acrylonitrile onto starch and the subsequent hydrolysis in sodium hydroxide solution to prepare absorbents is well known. This process has been utilized to produce the commercial product, Super Slurper. In a typical batch process, ~5% starch in water mixture is gelatinized at $95^{\circ}C$ under stirring for 1 hour then cooled to room temperature. The graft polymerization itself is carried out for approximately 2 hours at $25~30^{\circ}C$ on the gelatinized starch by eerie ion initiation. In this study, graft polymerization of acrylonitrile onto starch via a reactive extrusion process which is a continuous, efficient process is described. Initial concentration of starch in water is 35% and the reaction temperatures are between $50~80^{\circ}C$. However, the most significant difference in the reactive extrusion process is the short time in which the graft polymerization takes place. Preliminary results on the properties of graft polymerization products obtained from the reactive extrusion process are compared to those obtained from the batch process as well as the absorbency of the hydrolyzed samples. Absorbent material has also been prepared by sequential grafting and saponification in the extruder followed by a 2 hour heat treatment of the extrudate in an air circulated oven at $100^{\circ}C$.

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