پديد آورنده :
درويشي، رضا
عنوان :
بررسي پليمر شدن تعليقي غير همدماي وينيل كلرايد با هدف كاهش زمان واكنش
گرايش تحصيلي :
پليمر - صنايع پليمر
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان ، دانشكده مهندسي شيمي
صفحه شمار :
دوازده،199ص.: مصور، جدول، نمودار
استاد راهنما :
محسن نصر اصفهاني، روح اله باقري
توصيفگر ها :
پلي وينيل كلرايد , فرآيند , افزايش توليد
تاريخ نمايه سازي :
1394/07/14
استاد داور :
شادپور ملك پور، حميد صالحي مباركه، احمدرضا شفيع زادگان اصفهاني
كد ايرانداك :
ID785 دكتري
چكيده فارسي :
به فارسي و انگليسي
چكيده انگليسي :
484 Non isothermal Suspension polymerization of VCM Enhanced productivity Resin morphology and thermal stability Reza Darvishi r darvishi@ce iut ac ir June 25 2014 Chemical Engineering Department Isfahan University of Technology Isfahan 84156 83111 Iran Degree PhD Language FarsiProf M Nasr Esfahany Email mnasr@cc iut ac irProf R Bagheri Email bagheri@cc iut ac ir Abstract In the present study the feasibility of increasing the productivity of suspensionpolymerization of vinyl chloride in batch wise reactors was investigated using temperaturevariation strategy over the process time An optimal temperature trajectory in which thereaction temperature is higher at the beginning of the polymerization than that at the end was obtained applying the particle swarm algorithm PSO Such a non isothermalcondition was implemented in a 15 liter pilot scale reactor and 33 reduction in thereaction time relative to the isothermal case with the same K value and final conversion base case was obtained The molecular morphological and the chemical properties of theproduced poly vinyl chloride PVC resin were characterized Molecular weight andpolydispersity index of the nonisothermally produced PVC is the same as the equivalentisothermal polymerization The particle size distribution would be slightly wider fornonisothermal produced PVC compared to that produced isothermally Spannon isothermal 1 3 and Span isothermal 1 25 Both cold plasticizer absorption as an index of porosity andbulk density increases for PVC prepared by non isothermal condition Scanning ElectronMicroscopy SEM micrographs showed that the PVC grains prepared by variabletemperatures are more spherical with smoother surfaces than those produced isothermally The final mean primary particle size in the PVC resins prepared isothermally are greaterthan that in the grains formed under the nonisothermal trajectory The grains produced inconstant temperature are composed of packed fused primary particles whereas anagglomeration of smaller primary particles promoting the formation of porous PVC grainsis observed in the nonisothermal case The SEM image analysis of primary particles wasanalyzed at different conversions to estimate the conversion at which three dimensionalnetwork is formed The results show that applying the variable temperature acceleratesnetworking between the primary particles inside the polymerizing monomer dropletscreating nano scale pores For the first time in the present work the motionless conversionwas measured experimentally and proved that this conversion is the start point of majorchanges in the internal morphology of PVC particles According to the strong change ofmorphological properties of PVC resin around this point a mechanism was proposed to
استاد راهنما :
محسن نصر اصفهاني، روح اله باقري
استاد داور :
شادپور ملك پور، حميد صالحي مباركه، احمدرضا شفيع زادگان اصفهاني
