• Title/Summary/Keyword: kneading

Search Result 78, Processing Time 0.021 seconds

Comparison of Electrochemical Properties of EDLCs using Activated Carbon Electrodes Fabricated with Various Binders (활성탄소 전극의 제조방식에 따른 EDLC 특성비교)

  • Yang, Sun-Hye;Jeon, Min-Je;Kim, Ick-Jun;Moon, Seong-In;Kim, Hyun-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2006.11a
    • /
    • pp.353-354
    • /
    • 2006
  • This work describes the effect of binders, such as carboxymethylcellulose (CMC), CMC+Polytetrafluoroethylene (PTFE) and PTFE, on the electrochemical and mechanical properties of activated carbon-electrode for electric double layer capacitor. The cell capacitors using the electrode bound with binary binder composed of CMC and PTFE, especially m composition CMC ; PTFE = 60 : 40 wt %, has exhibited the better rate capability and the lower internal resistance than those of the cell capacitor with CMC. On the other hand, the sheet type electrode kneaded with PTFE was bonded with conductive adhesive on Al foil. This cell capacitor using the electrode with PTFE exhibited the best mechanical properties and rate capability compared to the CMC and CMC+PTFE one These behaviors could be explained by the well-developed network structure of PTFE fibrils during the kneading process.

  • PDF

Characterization and Properties of Composites of Woodflour and Polylactic Acid

  • Febrianto, Fauzi;Yoshioka, Mariko;Nagai, Yuko;Syafii, Wasrin;Shiraishi, Nobuo
    • Journal of the Korean Wood Science and Technology
    • /
    • v.34 no.5
    • /
    • pp.67-78
    • /
    • 2006
  • Modification of polylactic acid (PLA) and 10% maleic anhydride (MAH) with 15% dicumyl peroxide (DCP) based on MAH weight was conducted in the kneader at $160^{\circ}C$ and 30~70 rpm, for 15 min. The resulting MAH-modified PLA (PLA-MA) was then evaluated as a compatibilizer for PLA-wood flour (WF) composites. The FTIR and $^1H$-NMR analysis gave evidence of PLA-MA formation. After kneading and reacting with MAH and DCP, the number (Mn) and the weight average (Mw) molecular weights of PLA decreased as compared to the original PLA. The presence of WF in the composites decreased the tensile strength and several other physical properties. The higher the WF loading resulted in the greater the reduction of tensile strength. An addition of 10% PLA-MA as a compatibilizer to the composites improved the tensile strength and several other physical properties, increased the flow temperature, and decreased the melt viscosity. The improved composite revealed 1.42 times increased in tensile strength but not over PLA alone, and absorbed considerably less water compared to those of the composites free-compatibilizer.

Effect of Binders on Electrochemical and Mechanical Properties of Activated Carbon Electrode for Electric Double Layer Capacitor (EDLC용 활성탄소 전극의 전기화학적 기계적 특성에 미치는 바인더의 영향)

  • Jeon, Min-Je;Kim, Ick-Jun;Yang, Sun-Hye;Moon, Seong-In;Kim, Hyun-Soo;Oh, Dae-Hee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.19 no.12
    • /
    • pp.1167-1171
    • /
    • 2006
  • This work describes the effect of binders, such as carboxymethylcellulose (CMC), CMC+ Polytetrafluoroethylene (PTFE) and PTFE, on the electrochemical and mechanical properties of activated carbon-electrode for electric double layer capacitor. The cell capacitors using the electrode bound with binary binder composed of CMC and PTFE, especially in composition CMC PTFE = 60 : 40 wt.%, has better rate capability and the lower internal resistance than those of the cell capacitor with CMC. On the other hand, the sheet type electrode kneaded with PTFE was bonded with conductive adhesive on Al foil. This cell capacitor using the electrode with PTFE exhibited the best mechanical properties and rate capability compared to the CMC and CMC+PTFE one. These behaviors could be explained by the well-developed network structure of PTFE fibrils doting the kneading process.

The Quality Characteristics of Sponge Cake Containing a Functional and Natural Product(1. Mulberry Leaf Powder) (기능성 천연물을 첨가한 스펀지 케이크의 품질 특성(1. 뽕잎 분말))

  • Choi, Gil-Young;Bae, Jong-Ho;Han, Gab-Jo
    • Journal of the East Asian Society of Dietary Life
    • /
    • v.17 no.5
    • /
    • pp.703-709
    • /
    • 2007
  • The purpose of this study was to investigate the quality characteristics of sponge cake with various amounts of mulberry leaf powder in place of flour. The specific gravity of kneading was maintained at the different amounts of added mulberry leaf powder, which increased at ratios of 5, 10, 15, and 20 percent. The crumb decreased greatly when flour rather than mulberry leaf powder was used. As the amount of mulberry powder increased, red and yellow color decreased in both the crumb and crust. The volume and symmetry indices of the sponge cake slightly decreased when the amount of mulberry powder increased. However, uniformity was not significantly different between the samples. The specific volume of the cake decreased when the amount of the mulberry leaf powder increased. In addition, mulberry leaf powder increased the degrees of hardness and gumminess of cake, but did not show any differences for the cohesiveness and springiness of the cake texture. In the consumer acceptability test, the most favorable taste and odor were attained at the 10 percent level of mulberry leaf powder.

  • PDF

Preparation and Characterization of Polyamide/MEPDM Alloy to Improve a Low Temperature Impact Strength and Antistatic Property (저온 충격강도 및 대전방지성 향상을 위한 개질 EPDM을 함유한 polyamide alloy의 제조 및 물성)

  • Lee, Soo;Jin, Seok-Hwan
    • Journal of the Korean Applied Science and Technology
    • /
    • v.28 no.3
    • /
    • pp.299-305
    • /
    • 2011
  • Alloys of nylon(PA6) and ethylene-propylene-diene polymer, modified with maleic anhydride(MEPDM) were prepared using a melt kneading process. This study focuses on the effects of the content of MEPDM in PA6 blend on the mechanical and thermal properties of such blends where MEPDM is the dispersed phase. Mechanical properties were examined by stress-strain measurements and impact strength test. Both impact strength of PA6/MEPDM at room temperature and at $-20^{\circ}C$ were improved up to 400-550% with the amounts of MEPDM. However, PA6/MEPDM containing 3-5 wt% of MEPDM showed the about $700kg_f/m^2$ of the maximum tensile strength but 8.5 % of the lowest elongation. For certain compositions of PA6 with rubbery MEPDM, the interesting reduction of elongation is caused by the reaction of the polyamide amine end groups with maleic anhydride portion in MEPDM, that provided a reinforcement in the PA6 matrix. In addition, the introduction of antistatic agent on the surface of alloys causes significant reduction of their surface electrostatic resistance.

High-Performance and Fabrication of Graphene-based Flexible Supercapacitor

  • Ra, Eun Ju;Han, Jae Hee;Kim, Kiwoong;Lee, Sun Suk;Kim, Tae-Ho;An, Ki-Seok;Lim, Jongsun
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 2014.02a
    • /
    • pp.442-442
    • /
    • 2014
  • Although electrochemical capacitors (ECs), also known as supercapacitors or ultracapacitors, is one of the most promising energy-storage devices because of its high power density, super-high cycle life, and safe operation. We herein report a synthesis of graphene-based flexible films by kneading method. Thus, a device can be readily made by sandwiching a polymer membrane included ionic liquid electrolytes between two identical graphene-based flexible films. Devices made with these electrodes exhibit ultrahigh energy density values while maintaining the high power density and excellent cycle stability of ECs. Moreover, these ECs maintain excellent electrochemical attributes under high mechanical stress and thus hold promise for high-energy, flexible electronics.

  • PDF

Diagnosis and Treatment of Connective Tissue Massage (결합조직마사지의 진단과 치료)

  • Bae Sung-soo;Choi Jae-won;Lee Keun-heui;Kim Jong-soon;Kim Soo-min;Kim Byung-jo;Hwang Bo-Gak;Ju Mu-yeol
    • The Journal of Korean Physical Therapy
    • /
    • v.14 no.4
    • /
    • pp.224-233
    • /
    • 2002
  • General massage and sports massage techniques are kneading, petrisage and tappotment. These will be improve physiological reaction. Connective tissue massage is a reflex zone massage in the subcutaneous tissues. These are superficial and deeper fascia, intermuscular septa, blood vessel, perinerve tissue. It is frame work on organs in human-being, Therefore, abnormality of there tissues are a pathologic change of the organs. The pathologic changes are fined with visible investigation, manual investigation and stroking investigation on the reflex zone. The stroking on the reflex zone is the treatment also. Stroking methods are depend upon tissues and area. Short strokings are directed at approximately right angles against bone, muscular or facial board. Long strokings are very often follow the original cleavage lines. The back is divided for treatment purposes into sections. There are basic section, thoracic section and cervical section.

  • PDF

국산 골판지 고지를 재활용한 골판지 원지의 강도 극대화 기술

  • 최병수;류정용;김용환;신종호;송봉근
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
    • /
    • 2001.04a
    • /
    • pp.158-158
    • /
    • 2001
  • 산업용 포장재의 주원료로서 이용되고 있는 국산골판지고지(KOCC)는 반복적인 재활용 으로 인하여 섬유장이 짧고 매우 각질화된 상태이며, 펄프 내 미세분 함량이 50%이상에 달 하고 있다. 또한 섬유의 표면이 인쇄잉크, stickies 및 각종 이물질로 오염됨에 따라, 섬유자 체가 보유하고 있는 섬유간 결합 능력이 저하된 상태이다. 국산 골판지 고지를 재활용한 골판지 원지의 생산 시 탈수성 및 강도 저하의 단점을 극 복하는 것은 생산성과 품질향상의 측면이외에 고지 재생을 촉진시킨다는 의미를 지니고 있다. 상기한 KOCC의 단점을 극복하는 방안으로 섬유분과 미세분의 적절한 분급을 통하여 초지 시 탈수저향을 감소시키고 더불어 종이의 강도를 개선하는 방안이 본 연구센터에 의해 고안되었다. 아울러 고온압착건조 처리를 활용한 종이의 물성 개선법이 국내에 이미 적용된 상태로 건조시간의 단축 및 종이의 제반물성을 개선시켜주게 되었다. 하지만 이미 열화된 KOCC에 고온압착건조 처리를 적용하여 밀도를 증가시킨다 할지라 도 천연의 UKP를 이용한 종이에 준 하는 강도를 얻는 데에 한계가 있었다. K KOCC 펄프의 섬유간 결합 능력을 개선시키기 위하여 본 연구에서는 Kneading처리와 지력증강제를 첨가를 함께 실시하는 방안을 검토하였으며, 고온압착건조된 골판지 원지의 표면에 코팅처리를 실시하여 그 효과를 분석하였다. 이를 통해 국산 골판지고지를 재활용한 골판지원지의 강도 극대화 방안을 탐색하고자 하였다.

  • PDF

The study for compressibility of reconsititued Busan clay (부산점토 재성형 시료의 압축특성에 관한 연구)

  • Hong, Sung-Jin;Lee, Moon-Joo;Choi, Young-Min;Kim, Min-Tae;Lee, Woo-Jin
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • 2009.09a
    • /
    • pp.1141-1146
    • /
    • 2009
  • The compressibility of clay has been expressed e-log p' graph. In natural clay, e-log p' graph are changed by deposition condition and chemical cementation as well as Atterberg limits, whereas in reconstituted clay, it is generally known that e-log p’ curve is varied with Atterberg limits. However, e-log p' graph is possible to change according to the reconstituting methods and test conditions. In this study, consolidation tests are performed as various test condition for reconstituted Busan clay. Test results show that the relationship e/$e_L$ and log p' is almost constant with $e_L$. And the compression index obtained from slurry method sample is larger than one obtained from kneading method sample. Intrinsic compression line (ICL) of Busan clay is identical with ICL suggested by Burland.

  • PDF

A Study on Thermoplastic Elastomer Blend Using Waste Rubber Powder(I): Screw Configurations, Morphologies and Mechanical Properties (폐고무 분말을 이용한 TPE 블렌드에 관한 연구(I) : 스크류 조합, 모폴로지, 기계적 물성)

  • Lee, Sung-Hyo;Hwang, Sung-Hyuk;Kim, Jin-Kuk
    • Elastomers and Composites
    • /
    • v.36 no.2
    • /
    • pp.86-93
    • /
    • 2001
  • For solving the environmental problem of the waste EPDM and for new TPE blend materials, we developed a new kind of TPE material using a co-rotating twin screw extruder. To improve the mechanical properties of TPE material such as tensile strength, elongation at break, and modulus of the blend, PP and waste EPDM powder were blended with different screw configurations. The mechanical properties of the blends and morphology of the TPE were investigated. As the number of kneading disc and left-handed screw element increased, dynamic vulcanization of the material was increased because the shear stress and residence time of blends increased.

  • PDF