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Publication Metadata only Dispersion enhancement of multi-walled carbon nanotube (MWCNT) in nitrile rubber (NBR)(2013-10-04) Atip Boonbumrung; Pongdhorn Sae-Oui; Chakrit Sirisinha; Mahidol University; Thailand National Metal and Materials Technology CenterAttempts to enhance dispersion degree of multi-walled carbon nanotubes (CNT) in nitrile rubber (NBR) matrix, and to improve the NBR-CNT interaction were carried out by different approaches, namely, sonication and chemical treatments of CNTs... with nitric acid (HNO3), nitricsulfuric acid mixture (HNO3/H2SO4) and potassium permanganate (KMnO4). Rheological behavior of NBR/CNT composites was monitored as an indication of filler dispersion degree using the Rubber Process Analyzer (RPA2000) viaPublication Metadata only Relationships among blending conditions, size of dispersed phase, and oil resistance in natural rubber and nitrile rubber blends(2001-10-31) Chakrit Sirisinha; Sauvarop Baulek-Limcharoen; Jarunee Thunyarittikorn; Mahidol University; The Institute of Science and Technology for Research and Development, Mahidol Universitystrongly on the blending time than the rotor speed. The size of the NR dispersed phase is approximately independent of the rotor speed, but it decreases with increasing blending time up to 25 min. With a further increase in the blending time the NR... dispersed phase size decreases. The results for the relative tensile strength, which is an indicator of oil resistance, are in agreement with those of the blend morphology, indicating that the oil resistance in a 20/80 NR/NBR blend strongly dependsPublication Metadata only Oil resistance controlled by phase morphology in natural rubber/nitrile rubber blends(2003-01-03) Chakrit Sirisinha; Sauvarop Limcharoen; Jarunee Thunyarittikorn; Mahidol Universityviscosity of the blends depended more strongly on blending time than rotor speed. Size of the NR dispersed phase was approximately independent of rotor speed but decreased with increasing blending time up to 25 min. As blending time further increased, NR... dispersed phase size increased. The results of relative tensile strength, which is an indicator for oil resistance, in this study were in agreement with those of the blend morphology, indicating that the oil resistance in 20/80 NR/NBR blend depended stronglyPublication Metadata only Effects of silanization temperature and silica type on properties of silica-filled solution styrene butadiene rubber (SSBR) for passenger car tire tread compounds(2016-05-05) Puchong Thaptong; Pongdhorn Sae-Oui; Chakrit Sirisinha; Mahidol University; Thailand National Science and Technology Development Agency© 2016 Wiley Periodicals, Inc. Influence of silanization temperature on properties of silica-filled solution polymerized styrene butadiene rubber was investigated. Two types of silica, i.e., highly dispersible silica (HDSi) and conventional silica... (CSi), were compared. Results show that the increased silanization temperature leads to the enhanced rubber-filler interaction, filler dispersion, and cross-link density giving rise to the improvement in vulcanizate properties such as modulus, heatPublication Metadata only Relationship among Phase Morphology, Oil Resistance, and Thermal Aging Properties in CPE/NR Blends: Effect of Blending Conditions(2003-12-27) Chakrit Sirisinha; Pongdhorn Saeoui; Jantagarn Guaysomboon; Mahidol University; Thailand National Metal and Materials Technology CenterThe CPE/NR blends with blend ratio of 50/50% by weight were prepared with various blending conditions. The resistance to oil and thermal aging of the blends was investigated and correlated with phase morphology. The NR dispersed phase size in blends... was found to decrease with increasing rotor speed up to 45 rpm and subsequently level off at higher rotor speeds. With increasing mixing time at a given rotor speed, NR dispersed phase size reached a minimum and increased again with a further increasePublication Metadata only Development of eco-friendly coupling agent for precipitated silica filled natural rubber compounds(2014-01-01) Sirichai Pattanawanidchai; Surapich Loykulnant; Pongdhorn Sae-Oui; Naruewan Maneevas; Chakrit Sirisinha; Thailand National Metal and Materials Technology Center; Mahidol Universitysilica (ZMS). The success of ZMS preparation is evidenced by Fourier transform infrared spectroscopic results, in which a new absorption peak of the CS stretching vibration of dixanthate is observed, and by energy dispersive X-ray spectrometer (EDS...) results in which the two new elements (sulphur and zinc) can be detected. Compared to the unmodified silica (UMS), the ZMS possesses smaller agglomerate size and gives superior dispersion when incorporated into a natural rubber matrix. The enhancementPublication Metadata only Effects of mixing parameters and their interactions on properties of carbon black filled styrene-butadiene rubber(2018-07-01) Jirawat Narongthong; Pongdhorn Sae-Oui; Chakrit Sirisinha; Mahidol University; Thailand National Science and Technology Development Agencyare analyzed using response surface methodology. Results reveal that the dispersion index, Payne effect, and tensile properties are not linearly related to mixing time and filler loading but are linearly related to rotor speed and fill factor. The effect... of mixing time on dispersion index and Payne effect depends strongly on the levels of rotor speed and filler loading. Increasing the rotor speed or filler loading reduces the effect of mixing time on dispersion index and, thus, on the Payne effect. AmongPublication Metadata only Mixing efficiency in co-rotating batch mixer for preparation of NR/EPDM blends(2012-03-15) Anont Chaisuriyathepkul; Krisda Suchiva; Pongdhorn Sae-Oui; Chakrit Sirisinha; Mahidol University; Thailand National Metal and Materials Technology CenterAn in-house developed co-rotating batch mixer was used to prepare the blends of natural rubber (NR) and ethylene-propylene-diene terpolymer (EPDM) in the present work. Phase morphology and magnitude of dispersive mixing efficiency offered... by the in-house developed co-rotating batch mixer and a conventional counter-rotating batch mixer were compared. It has been found that the co-rotating batch mixer equipped with the MX2 rotor configuration could improve the dispersive mixing efficiency of NR/EPDMPublication Metadata only Oil and thermal aging resistance in compatibilized and thermally stabilized chlorinated polyethylene/natural rubber blends(2004-06-01) Chakrit Sirisinha; Pongdhorn Saeoui; Jantagarn Guaysomboon; Mahidol University; Thailand National Metal and Materials Technology Center, indicating that the oil resistance and thermal aging properties based on relative tensile strength in the 50/50 CPE/NR blends are strongly controlled by the size of the NR dispersed phase in CPE matrix. The smaller the dispersed phase size, the higherPublication Metadata only Influence of precipitated silica on dynamic mechanical properties and resistance to oil and thermal aging in CPE/NR blends(2005-06-15) Sirichai Pattanawanidchai; Pongdhorn Saeoui; Chakrit Sirisinha; Mahidol University; Thailand National Metal and Materials Technology Centerof curatives to the NR phase. In terms of phase morphology, with increasing silica loading, the NR dispersed phase size decreases due to the increase in compound viscosity and, thus, the shear stress available for efficient blending. An increase in silica... loading also en hances resistance to oil due to the decrease in the NR dispersed phase size associated with the dilution effect, but gives no significant impact on thermal aging resistance. According to the change in damping peak height associated