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Ming-Kuen Chang,Sung-Po Liu,Shyh-Shin Hwang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The development of fire retardant for wire and cable sheathing materials has oriented toward low smoke and halogen-free flame retardant technology to achieve better safety for electrical equipment and devices and to satisfy standards. However, many polymer flame resistance materials require a very high proportion of metal hydrate filler within the polymer matrix (60 wt%) to achieve a suitable level of flame resistance, which may lead to inflexibility, poor mechanical properties and problems during compounding and processing. In this study, the alumina trihydrate (ATH) was added to montmorillonite (MMT) as the halogen-free flame retardant of ethylene-vinyl acetate (EVA) copolymer, with various ratios of EVA/ATH/MMT. The prepared nanocomposites were characterized through various techniques of XRD, tensile test, DSC analysis, TGA, LOI evaluation, and FE-SEM to explore the effects of organic modified clay (OMMT) and the layer distance on the mechanical, thermal, and flame resistance properties. In the XRD examinations, the layer-distance of MMT increased from 1.27 to 1.96 nm when polymer was added to the octadecylamine modified MMT. The best tensile strength was obtained at 3 wt% MMT. In addition, the halogen-free flame resistance grade of EVA containing 3 wt% OMMT and 47 wt% ATH revealed the best elongation and fire resistance (LOI = 28). The tensile and flame resistance properties of the nanocomposites were also significantly improved.
Ming-Kuen Chang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Polymer layered silicate nanocomposites are very prevailing in both basic research and industrialdevelopment, among them montmorillonite (MMT) provide the most significant applied value. In thisstudy, structures and properties of various organic/inorganic nanocomposites of low-densitypolyethylene (LDPE) containing MMT and LDPE grafted maleic anhydride/montmorillonite (LDPE-g-MA/MMT) were investigated. Mechanical properties and thermal stability of LDPE/MMT and LDPE-g-MA/MMT nanocomposites were examined. Samples of LDPE/MMT and LDPE-g-MA/MMT nanocompo-sites were fabricated with twin-screw extruder and injection molding machine in accordance with thestandard test specimens. Furthermore, tensile, impact, bending, hardness, DSC, TGA, and SEMexaminations were performed to establish the structure–properties relationships. The mechanicalproperties significantly improved when the proper amounts of MMT and MA-grafted materials wereadded to LDPE. This improvement in properties is mainly due to the compatibilizing effect of MA grafts
Ming-Wei Wu,Zeng-Kai Huang,Chun-Feng Tseng,Kuen-Shyang Hwang 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.3
Metal injection molding (MIM) is a versatile technique for economically manufacturing various metal parts with complicated shapes and excellent properties. The objective of this study was to clarify the effects of powder type (water-atomized and gas-atomized powders) and various heat treatments (sintering, solutioning, H900, and H1100) on the microstructures, mechanical properties, and fracture behaviors of MIM 17- 4PH stainless steels. The results showed that better mechanical properties of MIM 17-4PH can be achieved with gas-atomized powder than with water-atomized powder due mainly to the lower silicon and oxygen contents and fewer SiO2 inclusions in the steels. The presence of 10 vol% δ ferrite does not impair the UTS or elongation of MIM 17-4PH stainless steels. The δ ferrite did not fracture, even though the neighboring martensitic matrix was severely cracked. Moreover, H900 treatment produces the highest hardness and UTS, along with moderate elongation. H1100 treatment produces the best elongation, along with moderate hardness and UTS.
Optimizing Channel Access in Wireless Local Area Network Environments with a New Backoff Approach
Hao-Ming Liang,Ce-Kuen Shieh,Sherali Zeadally,Naveen K Chilamkurti 보안공학연구지원센터 2009 International Journal of Multimedia and Ubiquitous Vol.4 No.2
Over the past few years, several backoff algorithms such as Exponential Increase Exponential Decrease (EIED) and Adaptive Enhanced Distributed Coordination Function (AEDCF)) have been proposed for wireless local area networks to improve channel access. We propose a new backoff technique that monitors the number of backoff counter pauses experienced and modifies the contention window accordingly. We evaluate and compare the performance of our proposed approach with EIED and AEDCF channel access techniques. Our simulations results, obtained under different network conditions, show improved performance for metrics such as the fairness index and end-to-end delay.
Wu Ming-Wei,Hwang Kuen-Shyang,Huang Hung-Shang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The microstructures of Ni-containing P/M steels produced by admixed powders or diffusion alloyed powders are usually heterogeneous. To improve the microstructure homogeneity, the effects of Mo and Cr additions in the prealloyed powder form were examined. The results showed that the microstructural homogeneity was improved and superior mechanical properties were achieved with increases in the alloy content, particularly for the Cr. Such a beneficial effect was attained due to the reduction of the repelling effect between Ni and C, as was demonstrated through thermodynamic analysis using the Thermo-Calc software.
Analysis of a cantilever bouncing against a stop according to Timoshenko beam theory
Tsai, Hsiang-Chuan,Wu, Ming-Kuen Techno-Press 1997 Structural Engineering and Mechanics, An Int'l Jou Vol.5 No.3
The bouncing of a cantilever with the free end pressed against a stop can create high-frequency vibration that the Bernoulli-Euler beam theory is inadequate to solve. An analytic procedure is presented using Timoshenko beam theory to obtain the non-linear response of a cantilever supported by an elastic stop with clearance at the free end. Through a numerical example, the bouncing behavior of the Timoshenko and Bernoulli-Euler beam models are compared and discussed.
Lu-Yen Chen,Jo-Ming Tseng,Chung-Hwei Su,Kuen-Yuan Chuang,Chun-Ping Lin,Shuh-Woei Yu 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.10
Tert-butyl(2-ethylhexyl)monoperoxy carbonate (TBEHC) 95 mass% is intrinsically a very unstable substance that can induce self-decomposition even under normal atmospheric condition. During storage, TBEHC 95mass%can release an enormous amount of heat if the temperature is higher than the recommended storage temperature, due to the self-accelerating reaction having been ignited. In this study, TBEHC 95mass% was tested by differential scanning calorimetry (DSC) under five heating rates (1, 2, 4, 6, and 8 oC/min) and four isothermal conditions (120, 125, 130,and 135 oC) to evaluate the basic kinetic and safety parameters of time to maximum rate (TMR), self-accelerating decomposition temperature (SADT), and temperature of no return (TNR). Under runaway reaction TBEHC 95 mass%releases a great quantity of heat. This study establishes an important guiding principle for related manufacturing processes worldwide.
Sikhumbuzo Charles Kunene,KUEN-SONG LIN,Meng-Tzu Weng,Maria Janina Carrera Espinoza,Chun-Ming Wu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
In this study, a series of thermo- and pH-dependent doxorubicin (DOX) carriers based on magnetic graphenenanosheets (MGNSs), functionalized by poly(N-isopropylacrylamide) (PNIPAM) and polyethylenemine(PEI) nanogel, targeting liver cancer cells were formulated. The temperature phase transitions of thecarriers can be tuned as a function of pH to the intended value in the range of 38–42 C. In vitro studiesshowed a high cell viability of above 90% at all doses of MGNSs and MGNS-nanogel against HEK293T normaland HepG2 cancerous cells, confirming the biocompatibility and nontoxicity of the carriers. In comparison,the MGNS-nanogel-DOX demonstrated a sufficient therapeutic effect towards HepG2 cell line. The cell viability results showed enhanced efficacy of the drug released by means of applied magneticfield (AMF). Moreover, an efficient cellular intake of the carriers into the HepG2 cells was achieved. Additionally, the achieved low DOX release at a lower temperature and neutral pH can retain the drugin the carriers until reaching the targeted sites. Nevertheless, the high drug release showed that therelease was triggered by high temperature and acidic pH. Hence, the developed thermo- and pHtunableMGNS-nanogel-DOX showed a high potential for microenvironment stimulus-prompted drugdelivery and cancer cell suppression.