• Title, Summary, Keyword: Clay

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Preparation and Properties of NBR-Clay Hybrid Membranes (NBR-Clay 하이브리드 막의 제조 및 물성)

  • 남상용;김영진
    • Membrane Journal
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    • v.14 no.2
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    • pp.132-141
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    • 2004
  • NBR-Clay hybrid membranes were prepared by melt intercalation method with internal mixer and two roll mills. MMT was intercalated or ekfoliated by the NBR and it was confirmed by X-ray diffraction method. D-spacing of the characteristic peak from MMT plate in WAXD was moved and diminished. Gas permeability, mechanical properties and thermal properties of the NBR-Clay hybrid membranes were investigated. Gas permeability through the NBR-Clay hybrid membranes decreased due to increased tortuosity made by intercalation of clay in NBR.

A Study on Morphology and Mechanical Properties of Biodegradable Polymer Nanocomposites (생분해성 고분자 나노복합체의 형태학 및 기계적 특성 연구)

  • Jang, Sang Hee
    • Clean Technology
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    • v.19 no.4
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    • pp.401-409
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    • 2013
  • BBiodegradable polymers have attracted great attention because of the increased environmental pollution by waste plastics. In this study, PLA (polylactic acid)/Clay-20 (Cloisite 20) and PLA (polylactic acid)/PBS (poly(butylene succinate)/Clay-20 (Cloisite 20) nanocomposites were manufactured in a twin-screw extruder. Specimens for mechanical properties of PLA/Clay-20 and PLA/PBS (90/10)/Clay-20 nanocomposites were prepared by injection molding. Thermal, mechanical, morphological and raman spectral properties of two nanocomposites were investigated by differential scanning calorimetry (DSC), tensile tester, scanning electron microscopy (SEM) and raman-microscope spectrophotometer, respectively. In addition, hydrolytic degradation properties of two nanocomposites were investigated by hydrolytic degradation test. It was confirmed that the crystallinity of PLA/Clay-20 and PLA/PBS/Clay-20 nanocomposite was increased with increasing Clay-20 content and the Clay-20 is miscible with PLA and PLA/PBS resin from DSC and SEM results. Tensile strength of two nanocomposites was decreased, but thier elongation, impact strength, tensile modulus and flexural modulus were increased with an increase of Clay-20 content. The impact strength of PLA/Clay-20 and PLA/PBS/Clay-20 nanocomposites with 5 wt% of Clay-20 content was increased above twice than that of pure PLA and PLA/PBS (90/10). The hydrolytic degradation rate of PLA/Clay-20 nanocomposite with 3 wt% of Clay-20 content was accelerated about twice than that of pure PLA. The reason is that degradation may occur in the PLA and Clay-20 interface easily because of hydrophilic property of organic Clay-20. It was confirmed that a proper amount of Clay-20 can improve the mechanical properties of PLA and can control biodegradable property of PLA.

Preparation and Properties of Ionomer-Clay Hybrid Gas Barrier Membranes (Gas Barrier성 Ionomer-Clay 하이브리드 막의 제조 및 물성)

  • Nam Sang Yong;Goo Hyung Seo;Kim In Ho;Kim Young Jin;Joo Dae Seong;Park Ji Soon;Kim Jin Hak
    • Membrane Journal
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    • v.14 no.4
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    • pp.320-328
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    • 2004
  • Ionomer-Clay hybrid membranes were prepared by melt intercalation method with twin extruder. MMT was intercalated or exfoliated by the ionomer and it was confirmed by X-ray diffraction method. D-spacing of the characteristic peak from MMT plate in WAXD was moved and diminished. Gas permeability, mechanical properties and thermal properties of the ionomer-clay hybrid membranes were investigated. Gas permeability through the ionomer-clay hybrid membranes decreased due to increased tortuosity made by intercalation of clay in Ionomer.

Physical Properties of Silicone Rubber/Clay Composites According to the Clay Type and Modification (Clay의 종류 및 표면처리가 silicone rubber/clay 복합체의 물성에 미치는 영향)

  • Yoon, Jin-San;Kim, Eung-Soo;Kim, Eun-Jeong;Lee, Tae-Hwa
    • Elastomers and Composites
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    • v.44 no.3
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    • pp.260-268
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    • 2009
  • Modification of clay surface was attempted by treating the clay with bis[(3-triethoxysilylpropyl)tetra sulfide (TSS) to raise the hydrophobicity and to induce a chemical reaction between the clay and the high temperature vulcanization-type silicone rubber matrix with purpose of improving the compatibility between the components, and thereby Na-$MMTS_4$ and Fe-$MMTS_4$ were synthesized by treating Na-MMT and Fe-MMT with TSS, respectively. Silicone rubber/clay composites were prepared by compounding the clays with silicone rubber. Thermal stability and mechanical properties were evaluated as a function of the clay types and the surface modification.

Modified Effects or Surfactants with Polymer-Clay Nanocomposites (고분자-점토 나노복합체에 관한 계면활성제의 개질 영향)

  • Kim, Hong-Un;Bang, Yun-Hyuk;Choi, Soo-Myung;Lim, Kyung-Hee
    • Journal of the Korean Applied Science and Technology
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    • v.23 no.4
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    • pp.290-299
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    • 2006
  • This article investigated to polymer-clay nanocomposite, especially in interfacial respect clay structure, its dispersion into polymer matrix, and clay modification is studied. The cationic exchange of surfactants with clay gallery results in preparing organo-clay capable of compatiblizing to monomer or polymer and increasing interlayer adhesion energy due to expansion of interlayer spacing. The orientation of surfactant in clay gallery is affected by chemical structure and charge density of clay, and interlayer spacing and volume is increased with alkyl chain length of surfactant, or charge density of clay. Also, the interaction between clay and polymer in preparing polymer-clay nanocomposite is explained thermodynamically. In the future, the study and development of polymer-clay nanocomposite is paid attention to the interfacial adhesion, clay dispersion within polymer, mechanism of clay intercalation or exfoliation.

Preparation and Properties of SEBS (Styrene Ethylene Butadiene Styrene Copolymer)-Clay Hybrid Gas Barrier Membranes (Gas Barrier성 SEBS (Styrene Ethylene Butadiene Styrene Copolymer)-Clay 하이브리드 막의 제조 및 물성)

  • Nam Sang Yong;Yeom Bong Yeol;Min Byoung Ryul;Kim Young Jin
    • Membrane Journal
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    • v.15 no.1
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    • pp.62-69
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    • 2005
  • SEBS-clay hybrid membranes were prepared by melt intercalation method with internal mixer. In the hybrid, the amount of clay content was fixed to 5 phr. MMT was intercalated or exfoliated by the ionomer and it was confirmed by X-ray diffraction method. D-spacing of the characteristic peak from MMT plate in SAXD was moved and diminished. Gas permeability, mechanical properties and thermal properties of the SEBS-clay hybrid membranes were investigated. Gas permeability through the SEBS-clay hybrid membranes decreased due to increased tortuosity made by intercalation of clay in SEBS.

Amino Silane, Vinyl Silane, TESPD, ZS (TESPD/Zinc Complex) Effects on Carbon Black/Clay Filled Chlorobutyl Rubber (CIIR) Compounds Part III: Comparative Studies on Hard Clay and Soft Clay Filled Compounds

  • Kim, Kwang-Jea
    • Carbon letters
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    • v.10 no.3
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    • pp.190-197
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    • 2009
  • Various silanes, amino silane, vinyl silane, sulfur silane (TESPD), and ZS (TESPD/zinc soap complex), are added into chlorinated isobutylene-isoprene copolymer (CIIR)/soft clay/carbon black (CB) and CIIR/hard clay/CB compounds and they are investigated with respect to the vulcanization characteristics, the processability, and the mechanical properties. Comparing hard clay and soft clay filled compounds, hard clay (Suprex) filled system shows a higher die C tear than the soft clay (GK) filled one. The other properties (Mooney, extrusion torque/pressure, torque rise ($M_H-M_L$), modulus at 300%) are close to each other. Among various silanes, the ZS treated hard clay (Suprex) compound shows the highest mechanical property following hard clay(S)/vinyl silane(V) and soft clay(GK)/vinyl silane(V) compounds. The TESPD and the ZS effectively helps a formation of a strong 3-dimensional network structure between silica and CIIR via coupling reaction due to bifunctional nature of TESPD. In addition to that, the ZS added compounds show both a better processability and mechanical properties compared to the S2 ones at low concentration due to improved compatibility between zinc soap and CIIR matrix. Only the ZS added compound shows both improved processabilities (Mooney, Extrusion torque-& pressure) and improved mechanical properties (degree of crosslinking, elongation modulus, tear, and fatigue to failure counts) on both CIIR/hard clay/CB and CIIR/soft clay/CB compounds.

Studies on Evaluation of Spent Bleaching Clay as a Feed Ingredient in Broiler Chicks (육계의 사료원으로 식용유 정제 폐백토(Spent Bleaching Clay)의 평가에 관한 연구)

  • Jeon, H.Y.;Son, J.H.
    • Korean Journal of Poultry Science
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    • v.34 no.2
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    • pp.99-104
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    • 2007
  • Studies were conducted to evaluate spent bleaching clay as a feed resource. Raw spent bleaching clay from the soybean refining process in a rotary reactor is rich in crude fat (26.0%) and crude ash (68.3%) but low in moisture (5.2%) and crude protein (0.5%). The peroxide value of spent bleaching clay was significantly higher than soybean oil (P<0.05). Also the acid value of spent bleaching clay and soybean oil were 9.72 and 0.001, respectively, it was significantly different(P<0.01). It is possible that the acidification of spent bleaching clay was prevented by artificial method. On the feeding experiment, 2.0 to 4.0% of dietary spent bleaching clay were improve body weight gain, feed intake and feed/ gain. Results indicate that spent bleaching clay may be used at 2.0 to 4.0% for broiler diets without deleterious effects on performance.

Organic/inorganic Hybrid Electrolytes for the Application of Direct Methanol Fuel Cell (DMFC) - Preparation and Properties of Sulfonated SEBS (SSEBS)-clay Hybrid Membranes - (직접메탄올 연료전지용 유무기 하이브리드 전해질 - 술폰화된 SEBS (SSEBS)-clay 하이브리드 막의 제조 및 물성 -)

  • Nam Sang Yong;Park Byung-Kil;Kong Sung-Ho;Kim Young Jin
    • Membrane Journal
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    • v.15 no.2
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    • pp.165-174
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    • 2005
  • Sulfonated poly(styrene-ethylene-butadiene-styrene) (SSEBS)-clay hybrid membranes were prepared by solution method. In the preparation of hybrid membrane, the amount of clay content was fixed to 5 phr and montmorillonite (MMT) was fully exfoliated by the SEBS and it was confirmed by X-ray diffraction method. D-spacing of the characteristic peak from MMT plate in WAXD was fully diminished. Gas permeability, mechanical properties and thermal properties of the SSEBS-clay hybrid membranes were investigated. Gas permeability through the SSEBS-clay hybrid membranes decreased due to increased tortuosity made by exfoliation of clay in SEBS.

The Introduction of Egg-Cam Clay Model and Elasto-Plastic Analysis of Reinforcement Effect on Buried Pipe (Egg-Cam Clay 모델 제안 및 지중매설관의 보강효과의 탄소성모델 해석)

  • Ahn, Tae-Bong;Cho, Sam-Duck;Kim, Jin-Man
    • Journal of the Korean Geoenvironmental Society
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    • v.3 no.2
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    • pp.5-14
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    • 2002
  • In this study, stress-deformation characteristics of buried pipe are studied. A numerical model, i.e., Egg-Cam Clay is introduced for the analysis of soft clay. Cam Clay model has a difficulty in analyzing soft clay that has two properties of shrinkage and swelling. Egg-Cam Clay model is modified format of Cam Clay model. In addition, Mohr-Coulomb model using finite element method is employed to verify effects of the geogrid, EPS geofoam. Stress deformation of several cases of pipe and other reinforcemnt material combinations are analyzed. Geofoam and geogrid have positive effects on the deformation characteristics.

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