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- 저자 : MINOO NAEBE (검색결과 2 건)
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Gelayol Golkarnarenji,MINOO NAEBE,Jeffrey S. Church,Khashayar Badii,Alireza Bab-Hadiashar,Stephen Atkiss,Hamid Khayyam 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
Studying the presence and progress offiber defects, such as skin-core structure, is an important tool foranalysis of a chemical process. In this article, the skin core morphology has been analyzed by opticalmicroscopic (OM) images and Fourier transform infrared attenuated total reflectance mapping (FTIR-ATRmapping). The results of FTIR-ATR mapping showed that thefiber is almost uniform in the core area whileOM images are accurate enough to be used for skin-core analysis. Using OM images, the core ratio ofsamples were measured to quantify the skin-core structure. Non-parametric kernel density estimationmethods have then been compared with conventional parametric distribution models using these data. The results reveal that the parametric methods cannot adequately describe the skin-core phenomenonand that the non-parametric distributions are more appropriate for the quantification of skin-coremorphology. By applying the non-parametric distributions, a model has been developed, which describesthe relationship between the skin-core defect and the operation parameters of thefiber production. Thisapproach can be used to predict the probability of skin-core occurrence and can be used to decrease thepresence of this phenomenon in the carbonfibers production industry. Our results show thattemperature is one of the most significant operational parameter at a typical oxygen concentration (in airat atmospheric pressure) governing the skin-core formation.
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MOHAMMAD MAHDI ABOLHASANI,Qipeng Guo,AZAM JALALI-ARANI,MINOO NAEBE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Poly(vinylidene fluoride) (PVDF) nanocomposites were prepared by melt-mixing. The dispersionof clay platelets and rheology of nanocomposites were analyzed using X-ray diffraction (XRD),scanning electron microscopy (SEM), transmission electron microscopy (TEM) and rheometricmechanical spectrometer (RMS). The transformation of α to β and γ phase in PVDF was inducedby the addition of nanoclay and subsequently the isothermal crystallization kinetics of neat PVDF and its nanocomposite have been investigated. The interaction between clay nanofillers and PVDF macromolecular chains induced the change of conformation from trans-gauche to all-trans crystal structure in PVDF segment. The isothermal crystallization of PVDF/clay nano-composites was carried out by Differential Scanning Calorimetry (DSC) technique. The influence of clay platelets on nucleation crystallization rate and Avrami exponent were studied. PVDF/clay nanocomposite showed higher crystallization rate indicating that nanoclay has acted as an effective nucleation agent. This nucleation effect of nanoclay increased the Avrami exponent anddecreased the degree of crystallinity.
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