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- 저자 : Sung-Po Liu (검색결과 2 건)
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Sung-Po Liu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Polyethylene (PE) provides good flexibility at low temperatures, chemical stability, and electrical performance that makes it an ideal insulating material for wire and cable, but it has low melting point and is flammable. In fire events, PE must be modified with additives to enhance its flame retardancy and satisfy the fire safety standards. In this study, we used the LDPE and cross-linked polyethylene (XLPE) as the matrix, added nanoclay montmorillonite (MMT), flame retardant magnesium hydroxide (MH) and compatibilizer LDPE grafted maleic anhydride (LDPE-g-MA). The PE/PE-g-MA/MH/MMT nanocompo-sites were compounded using the twin screw extruder, then were injection molded into the standardized specimens. The properties of nanocomposites were characterized with XRD, TGA, and DSC techniques and LOI, tensile, and impact examinations. The results showed that the interlayer of OMT (modification of organoclay) modified with dodecylamine expanded to about 4.1 A˚ and there was no 2θ peaks between 1.5˚ and 10˚, indicating that the dispersion of nanocomposites were exfoliation structure from XRD pattern. The tensile and impact strengths were enhanced with LDPE-g-MA and clay added. The increase in char residual of nanocomposites indicated that the thermal stability at elevated temperatures improved. The XLPE nanocomposites achieved the effective level of flame retardancy.
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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.
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