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RISS 인기검색어
- 검색키워드
- 저자 : Pourdeyhimi, B. (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Effect of Dilation on the Mechanical Characterization of Vascular Prostheses
Ulcay Y.,Pourdeyhimi B. The Korean Fiber Society 2005 Fibers and polymers Vol.6 No.1
The purpose of this study has been to investigate the effect of dilation on the some mechanical properties of several types of warp-knitted vascular grafts. The structures of warp knit vascular grafts used in the experiments were reverse locknit, locknit, and Tricot. Various mechanical properties of these grafts were determined using devices developed for the purpose. Clinical data obtained were compared with experimental results of warp knit vascular grafts. The most important mechanical properties are found to be creep extension, bursting strengths, and compliance. Preliminary results indicate that vascular grafts are non-compliant and exhibit creep which is predictive of the long term dilation that has been noted in the clinical results. It is found that there is a positive correlation between experimental data and clinical results for at least the grafts tested.
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Boehmite Nanoparticles Incorporated Electrospun Nylon-6 Nanofiber Web for New Electret Filter Media
염봉열,심은경,Behnam Pourdeyhimi 한국고분자학회 2010 Macromolecular Research Vol.18 No.9
Nylon-6 (PA6) nanofiber webs incorporated with boehmite nanoparticles as an electrostatic charging agent were electrospun and their fiber morphology was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). SEM showed that the median fiber diameter of the PA6 nanofibers was 73 nm and boehmite nanoparticles had little effect on the fiber diameter. The filtration performance of the nanofiber web was measured using 0.3 micron DOP aerosols at a 5.3 cm/s face velocity. Processed and corona charged PA6nanofiber web showed significant improvement in the submicron aerosol capture efficiency without a change in the air flow resistance compared to the discharged nanofiber web. These results suggest that the electrospinning process imparted electrostatic charge efficiently on the PA6 nanofiber web, and the electrostatic surface potential of a nanofiber web is increased with the incorporation of boehmite nanoparticles.
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Surface Crystallinity of Meltspun Isotactic Polypropylene Filaments
Ali Kilic,Keith Jones,심은경,Behnam Pourdeyhimi 한국고분자학회 2016 Macromolecular Research Vol.24 No.1
In this study, surface crystallinity of meltspun polypropylene (PP) filaments was reported. Results obtained from attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy were confirmed with tapping mode atomic force microscopy (TM-AFM) analysis. ATR-FTIR tests were performed directly on longitudinal surfaces of the filaments, where IR radiation penetrates up to a specific depth. TM-AFM measurements were done on microtomed cross-sections of the filaments, which were scanned carefully to investigate stiffness. Annealing enhanced the surface crystallinity of the filaments in a significant way. Interestingly, samples annealed at 70 and 110 oC for 12 h exhibited similar crystallinity on the uppermost 500 nm surface, whereas for the bulk a continuous increase was observed after XRD studies. 12 h annealing at 70 oC modified the endothermic thermogram, while it did not causes significant effect on overall bulk crystallinity. Differences in the behavior of surface and bulk of the fibrous materials should be considered particularly for surface treatment, i.e. plasma, corona discharge, chemical vapor deposition. Results are also pertinent for water and dye absorbency in polymers.
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