نتایج جستجو برای: spinning fibers
تعداد نتایج: 80010 فیلتر نتایج به سال:
Introduction Fibers are produced worldwide in enormous quantities. More than 20 million tons of synthetic fibers and 20 million tons of natural fibers are manufactured each year. The total length of these fibers corresponds to about 10 000 times the distance from the earth to the sun. A characteristic feature of a fiber is that its length is much greater than its diameter. The great anisotropy ...
We report a facile method to control intra-fiber porosity via varying the relative humidity and inter-fiber voids through the blending of two different polymeric fibers via multi-nozzles spinning of electrospun fibers for selective adsorption of oil from water.
Carbonaceous mesophases are liquid crystalline precursor materials that can be spun into high performance carbon fibers using the conventional melt spinning process. Carbon fiber property optimization requires a better understanding of the principles that control the structure development during the fiber formation processes and the rheological processing properties. This work presents the elas...
تکنولوژی نانو مطالعه مواد در سطح نانو است .این موضوع بسرعت در حال رشد می باشدکه به دلیل پتانسیل فوق العاده آن در ایجاد مواد جدیدی است که کاربردهای پیشرفته ای دارد . در این پروژه پلیمر طبیعی کیتوسان با استفاده از روش الکتروریسی به الیاف نانو تبدیل گردیده اند و تاثیر عوامل مختلف روی تولید و خواص (قطر) مورد ارزیابی قرار گرفته است. از کیتوسان , mw=1000kda)وdda=85% (به صورت محلول در اسید استیک 2% بر...
Drawing to change the structural properties and cyclization behaviors of the polyacrylonitrile (PAN) chains in crystalline and amorphous regions is carried out on PAN and PAN/carbon nanotube (CNT) composite fibers. Various characterization methods including Fourier transform infrared spectroscopy, differential scanning calorimetry, X-ray diffraction and thermal gravimetric analysis are used to ...
This study presents a method for fabrication of ultrafine polymeric nanofibers as well as nano/micro particles utilizing centrifugal and electrostatic forces simultaneously. To reduce the diameter and variety of nanofibers produced from solid state polymerized PA66, a unique electrocentrifuge spinning device was utilized with a rotating nozzle and collector, while the fabrication process (spinn...
Lignin/lignin blends were used to improve fiber spinning, stabilization rates, and properties of lignin-based carbon fibers. Organosolv lignin from Alamo switchgrass (Panicum virgatum) and yellow poplar (Liriodendron tulipifera) were used as blends for making lignin-based carbon fibers. Different ratios of yellow poplar:switchgrass lignin blends were prepared (50:50, 75:25, and 85:15 w/w). Chem...
در این تحقیق، فتیله¬های نایلون و پنبه با هفت نسبت مختلف (10، 22، 34، 46، 59، 72 و 85% نایلون) مخلوط شدند و نخ¬های مخلوط نایلون/پنبه، همانند نخ¬های نایلون و پنبه در سیستم ریسندگی رینگ با سه فاکتور تاب مختلف 4/3، 6/3 و 9/3 با نمره 7/19 تکس(ne30)، تولید شدند. خصوصیات فیزیکی-مکانیکی نخ¬های تولیدی از قبیل استحکام کششی، پرزینگی، مقاومت سایشی و یکنواختی مورد بررسی قرار گرفت.نتایج نشان می¬دهد که با افز...
Broader applications of carbon nanotubes to real-world problems have largely gone unfulfilled because of difficult material synthesis and laborious processing. We report high-performance multifunctional carbon nanotube (CNT) fibers that combine the specific strength, stiffness, and thermal conductivity of carbon fibers with the specific electrical conductivity of metals. These fibers consist of...
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