5033

4737

كارشناسي ارشد

شيمي نساجي و علوم الياف

اصفهان: دانشگاه صنعتي اصفهان، دانشكده نساجي

1388

[هشت]،122ص: مصور، جدول، نمودار

ص.ع: به فارسي و انگليسي

علي زادهوش

21/11/88

شادپور ملك پور، محمد مرشد

1396/09/27

كتابنامه

مهندسي نساجي

ID4737

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

Comparison of Changes in Average Molecular Weight of a PET by Solid State Polymerization and Chain Extender Method Ima Ghaeli Ema ghaeli@tx iut ac ir July 11 2009 Department College of Textiel Engineering Isfahan University of Technology Isfahan 84156 83111 Iran 12pt TNR Degree M Sc Language FarsiSupervisor s Name and Email address Dr Ali Zadhoush zadhoush@cc iut ac irAbstractAfter its introduction as a suitable material for synthetic fibers about fifty years ago poly ethyleneterephthalate PET has found new interesting and enduring applications in many cases without anyalternatives The opportunities for PET applications are related to its properties originating mostly from itsstructural characteristics In general the range of applications is based on the typical set of propertiesoffered by the material which are a result of its chemical structure and its processing history In otherwords the chemistry during material synthesis and chemical changes during post reactor processing havean influence on the desired application In this research comparison between two methods of increasing the molecular weight of PET chainextension method and solid state polymerization method separately and simultaneously has beeninvestigated The experiments were based on the addition of a multifunctional glycidyl compound TGIC as reactive additive in the melt phase and transmission of the resulted product to the solid statepolymerization reactor Finally the effect of chain extender and solid state polymerization on the polymerproperties such as molecular weight and end group concentration will be investigated Experimental works such as inherent viscosity end group titration X Ray diffraction and FTIR have beendone to study the polymer properties The results show the significant increase in the molecular weight of samples treated in solid state phasewhich is more than the molecular weight of samples treated with chain extenders in the melt phase Theresults show the reduction in the molecular weight of samples treated with chain extenders in the first stepand solid state polymerized in the second step due to the end group consumption by the chain extenders inthe first step which causes the lack of end groups needed for the second process So the SSP conditioncauses thermal degradation in polymer chains and decreases the molecular weight of polymer Key WordsSolid State Polymerization Chain extender Poly Ethylene Terephthalate GlycidylCompound

علي زادهوش

شادپور ملك پور، محمد مرشد