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Long- and short-term creep of polyoxymethylene/polyurethane/alumina ternary composites by comparison 总被引:2,自引:0,他引:2
S. Siengchin 《Mechanics of Composite Materials》2009,45(4):415-422
Ternary composites consisting of polyoxymethylene, polyurethane (PU), and boehmite alumina were produced by melt blending
with and with out latex precompounding. The latex precompounding served to predisperse the alumina particles. The related
advanced masterbatch (MBa) was produced by mixing the PU latex with the water-dispersible boehmite alumina. The dispersion
of alumina and rubber particles was studied by using the scanning electron micros copy. The creep properties of the composites
were determined from results of long- and short-term creep tests (per formed at various temperatures). The composites produced
by the MBa technique out performed those made by direct melt compounding with respect to most of creep characteristics. The
Findley power law was found to be fairly applicable to the experimental results obtained. Master curves (strain vs. time)
were also constructed by employing the time-temperature super position principle. 相似文献
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An epoxy resin (Epon 828) was filled with single- and multiwalled carbon nanotubes (SWCNT and MWCNT) in two steps by using
the high shear mixing and ultrasonication techniques. The melt flow of the composites was characterized in a plate/plate rheometer.
The thermomechanical properties of the composites were determined in dynamic mechanical analysis tests performed at various
frequencies and temperatures. It was found that the incorporation of SWCNT or MWCNT increased the viscosity and stiffness
of epoxy above its glass-transition temperature. The time-temperature superposition principle was employed to estimate the
storage modulus of the composites as a function of frequency (f = 10–33–103 Hz) in the form of master curves. 相似文献
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T. Senthil Muthu Kumar Huafeng Tian A. Varada Rajulu J. T. Winowlin Jappes Suchart Siengchin 《International Journal of Polymer Analysis and Characterization》2017,22(5):415-423
Using biodegradable polypropylene carbonate as the matrix and the tamarind nut powder (TNP) in 5–25?wt% as the filler, the biocomposites were prepared. The biocomposites were characterized by Fourier transform infrared, X-ray diffraction, and thermogravimetric analysis techniques. The distribution of the TNP in the biocomposites was examined by polarized optical microscope. The tensile strength of the biocomposite films was higher than that of the matrix and increased with filler content whereas a reverse trend was observed in % elongation at break. These films with increased tensile strength can be considered for packaging applications. 相似文献
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Petcharakorn Hanpanich Somchai Pinlaor Lakhanawan Charoensuk Puangrat Yongvanit Chunpen Thomas Suchart Kothan Eimorn Mairiang 《Magnetic resonance imaging》2013,31(8):1418-1425
A 3 T MR scanner was used to investigate the relationship between the alteration of bile duct lesions and the hepatic metabolic changes in hamsters infected with Opisthorchis viverrini by using 3 T MRI and 1H MR spectroscopy. Animals were divided into control and infected groups. Five normal hamsters were used as control; fifty-five hamsters were infected with O. viverrini to induce bile duct lesions and hepatic metabolic changes. T2-weighted image sequence in three orthogonal planes were conducted by MRI scans. Single-voxel 1H MRS was performed to obtain the relative choline-to-lipid ratios. The livers and bile ducts were excised for the histologic examination. The progression of bile duct changes by histology and metabolic changes in O. viverrini infected hamsters were co-investigated. In the O. viverrini-infected group, the T2-weighted images revealed the time-dependent intra- and extra-hepatic duct dilatations in the liver. The mean (± SD) choline-to-lipid ratios were 0.11 ± 0.035 in the control group, whereas the ratio in the infected group increased significantly with the progression of time. Histologic grading of hepatic inflammation and fibrosis were correlated well with the MRI grading (Spearman rank correlation test; r = 0.746 and p < 0.001). The control group showed no dilatation of the bile ducts and showed normal liver patterns. Noninvasive technique, MRI and 1H MRS can demonstrated and applied to evaluate not only the inflammation-related fibrosis in the small bile ducts but also the metabolic changes in the liver induced by O. viverrini infection. A significant increase in the choline-to-lipids ratios were observed in parallel with the time-course of infection. O. viverrini infected in human is detected by stool examination. Hepatobiliary morbidity is detected and followed up by ultrasonography. MRI and MRS can be used in conjunction with ultrasonography for evaluation of progression of the disease. 相似文献
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Chanama Manee Wunnakup Thaniya De-Eknamkul Wanchai Chanama Suchart 《平面色谱法杂志一现代薄层色谱法》2009,22(1):49-53
JPC – Journal of Planar Chromatography – Modern TLC - Plaunotol, an acyclic diterpenoid present in Croton stellatopilosus Ohba leaves, is a product of hydroxylation, catalyzed by... 相似文献
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Jiratti Tengsuthiwat Suchart Siengchin Richárd Berényi József Karger-Kocsis 《Journal of Thermal Analysis and Calorimetry》2018,132(2):955-965
Nd:YAG laser (355 nm) induced surface modifications in polylactic acid (PLA), and its composites with silver nanoparticles (AgNPs, size range between 120 and 150 nm) with and without additional melamine–formaldehyde-coated short sisal fibers were studied as a function of laser pulse numbers. The AgNP content was varied (100, 300 and 500 ppm), whereas the sisal content kept as constant (9 mass%). The PLA-based systems with a fully amorphous matrix were irradiated with 1–256 laser pulses at a constant fluence of 0.32 µJ µm?2. Changes in the irradiated surfaces were assessed and quantified by light and scanning electron microscopic pictures. Protrusion with bubbling, bubbled protrusion with cratering and crater formation with more or less bubbled ridges were found as characteristic ablation features. Bubbling was traced to entrapped gaseous products of PLA degradation, while the onset of ridges was ascribed to the melt flow of the PLA matrix caused by laser shock waves. The laser irradiation caused damage and ablation highly depended on the actual composition, which influenced the UV absorption at 355 nm, which was measured as well. 相似文献
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Rajeshkumar G. Devnani G. L. Maran J. Prakash Sanjay M. R. Siengchin Suchart Al-Dhabi Naif Abdullah Ponmurugan K. 《Cellulose (London, England)》2021,28(9):5373-5385
Cellulose - The aim of the present work was to extract novel natural cellulosic fibers from the leaves of purple bauhinia trees. To the best of our knowledge, this is the first time that, the... 相似文献