4805

4524

كارشناسي ارشد

شيمي نساجي و علوم الياف

اصفهان: دانشگاه صنعتي اصفهان، دانشكده نساجي

1388

ده،109،[II]ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

عبدالكريم حسيني

حسين توانايي

9/9/88

علي اكبر قره آغاجي، صديقه برهاني

مهندسي نساجي

ID4524

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Investigation of Wicking Phenomenon in Poly Acrylo Nytril Electrospinning Nano Fiber Yarn Mahbube Sadat Musavi Jad musavi@tx iut ac ir Date of Submission 26 April 2009 Department of Textile engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Seyed Abdolkarim hoseini hoseinir@cc iut ac ir Abstract Capillary forces are the cause of automatic penetration of liquid in fibrous network Voids between fibers are assumed as capillary interstice which can be filled by liquid The most important factors in capillary are surface area and void size which vary in nanoyarns in comparison to normal yarns Because nanofibers and their produced yarns have extended surface area and nanometer scale voides This characteristic of fibers is very important in most of textile operations such as dyeing printing finishing and composites This study is based on the observation and measurement of capillarity of colored liquid For this reason liquid height h is expressed as a function of time t During the capillary rising of colored liquid through the yarn images taken by a digital camera should be analyzed For the capillary experiments the produced yarn is a nonofiber The polymer chosen for producing yarn is poly acrylo nitrile In optimizing conditions the yarn is electrospun afterwards heat setting has been done in boiling water using tensile method The Lucas wash burn equation is confirmed for all cases Totally capillary rate coefficient will reduce by increasing yarn twist due to the reduction in capillary interstice size and unity of capillary According to statistical results twist level affect significantly the capillary rise of colored liquid in yarn Increasing heat setting from 0 to 50 will increase the capillary coefficient due to the more homogeneity of capillary spaces in yarn structure Increasing heat setting from 50 to 100 will reduce capillary coefficient because of the low capillary length Keywords Capillary rise nanoyarns poly acrylo nitrile Capillary rate coefficient twist heat set pdfMachine is a pdf writer that produces quality PDF files with ease Get yours now Thank you very much I can use Acrobat Distiller or the Acrobat PDFWriter but I consider your product a lot easier to use and much preferable to Adobe s A Sarras USA

عبدالكريم حسيني

حسين توانايي

علي اكبر قره آغاجي، صديقه برهاني