پديد آورنده :
باصري، سميه
عنوان :
بررسي ريز ساختار الياف پلي ﴿اتيلن ترفتالات﴾ كشيده شده در دماي محيط و عمل شده با سيال فوق بحراني
گرايش تحصيلي :
مهندسي نساجي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده نساجي
صفحه شمار :
نوزده،167ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمد مرشد، محمد كريمي
استاد مشاور :
مصطفي يوسفي
توصيفگر ها :
كشش سرد , انتقالات مزومورفيك
تاريخ نمايه سازي :
27/1/91
استاد داور :
ناصر محمدي، محمد حقيقت كيش، مرتضي صادقي
كد ايرانداك :
ID420 دكتري
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
187 Study of Microstructure of Cold Drawn PET Fibers Exposed to Supercritical Carbon Dioxide Somayeh Baseri s baseri@tx iut ac ir Jan 3 2012 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Supervisors Dr Mohammad Morshed morshed@cc iut ac ir Dr Mohammad Karimi mkarimi@aut ac ir Advisors Dr Mostafa Yousssefi Department Graduate Program Coordinator Dr Mohammad Reza SalimpourAbstractIn this thesis samples of partially oriented yarn POY PET fibers were uniaxially drawnbelow the glass transition temperature Tg at a various draw ratios to obtain filaments withdifferent structures and then were exposed to scCO2 under and without tension conditionsto induce morphological changes in them The evolution of mesomorphic phases and thestructural changes under exposure to scCO2 were investigated by conventional methodssuch as DSC FTIR WAXS DMA birefringence density measurements and mechanicalproperties A good correlation was obtained between the results of various analyses Theresults showed that sample treatment conditions have an important role on the structuralchanges and in transforming the oriented chains in the mesophase into the crystalline ornon crystalline domains PET fibers exposed to scCO2 under tension present higher valuesof crystallinity orientation tenacity Young s modulus and molecular compactness in theamorphous domains but lower values of the breaking elongation extensibility and transientstructures than the samples exposed without tension Key Words Poly ethylene terephthalate Mesomorphic transformation Cold drawing Supercritical CO2 Fractional Free Volume Full Professor Associate Professor Asistance Professor
استاد راهنما :
محمد مرشد، محمد كريمي
استاد مشاور :
مصطفي يوسفي
استاد داور :
ناصر محمدي، محمد حقيقت كيش، مرتضي صادقي
