پديد آورنده :
صفايي، بنفشه
عنوان :
بررسي ساختار و خواص الياف پروپيلن حاوي نانو لوله هاي كربني چند ديواره
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شيمي نساجي و علوم الياف
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده نساجي
صفحه شمار :
ده، 94ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
مصطفي يوسفي
توصيفگر ها :
كامپوزيت , خواص مكانيكي
تاريخ نمايه سازي :
20/2/91
استاد داور :
علي زادهوش، شادپور ملك پور
تاريخ ورود اطلاعات :
1396/10/06
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
99 Study of the Structure and Properties of Polypropylene Multi Walled Carbon Nanotube Nanocomposite Fibers Banafsheh Safaie b safaie@tx iut ac ir Date of Submission 15 February 2012 Department of Textile Engineering Isfahan University of Technology Isfahan 8415683111 Iran Degree M Sc Language Farsi Supervisor s Name Dr M Youssefi youssefi@cc iut ac ir Abstract Polymeric composites based on the combination of polymers both thermoplastic and thermoset and mineralfillers metals and fibers have found a wide range of applications over the past 40 years Recently thetremendous potential for property enhancements when nanoscale particles such as layered silicates or carbonnanotubes CNTs are incorporated into polymers has led to an explosion of research activity in polymer basednanocomposites Polypropylene PP is one of the most important commodity polymers It is extensively used inindustry to manufacture bottles films fibers etc Therefore a great deal of effort has been made to modify itsmechanical properties The goal of our research program is producing multi walled carbon nanotubes MWCNT polypropylene composite fibers via straightforward melt spinning and studying mechanical propertiesand morphology of the composite fibers Composites were produced by dry blending of PP granules with a givenratio of multi walled carbon nanotubes MWNTs using a twin screw extruder Fibers were melt spun using amelt spinning apparatus Some of the process variables were investigated e g mixing time rotor speed concentration of nanotube and fiber s draw ratio Physical properties and structure of the composite fibers wereinvestigated using Several techniques such as tensile testing Thermal Gravimetric Analysis TGA FourierTransform Infrared Spectroscopy FTIR X ray Diffraction XRD Differential Scanning Calorimetry DSC birefringence and nanoindentation The results from measurements of helical content ratio of the fibers indicatean increase in the ordered region of the fibers with the increase in nanotube concentration rotor speed and fiber sdraw ratio The molecular orientation of the fibers was increased with increase in nanotube concentration rotorspeed and draw ratio DSC and XRD results showed an increase in overall crystallinity of the composite fiberscompared to pure PP fibers Tensile tests showed a 7 increase in breaking stress of the composite fibers 1 wt MWNT Modulus was increased about 17 in the composite fibers 0 5 wt MWNT compared to pure PPfibers too Young s modulus and the breaking stress of drawn composite fibers increased about 15 withincrease in rotor speed of the mixing twin extruder Increasing draw ratio of the composite fibers caused anincrease in fiber s Young modulus and breaking stress too Composite fiber s hardness was increased withincrease in nanotube concentration Experimental mechanical results were compared with some theoreticalmodels such as Krenchel s rule and Halpin Tsai for elastic modulus and Pukanszky s model for yield stress Key Words Composite Fibers Mechanical properties Muli walled carbon nanotube Polypropylene
استاد راهنما :
مصطفي يوسفي
استاد داور :
علي زادهوش، شادپور ملك پور
