Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Modification Of Polypropylene

Grafting of maleic anhydride onto polyproylene has a considerable industrial interest because of compatibility, adhesion and reactivity properties of final grafted product obtained. It is the aim of this work to produce maleated polypropylene as a final product by means of melt radical grafting method and also to obtain the processing conditions for this final product as well as the effects of used chemicals; mainly the initiators and maleic anhydride. Maletaed polypropylene is used as a coupling agents for many additives such as calcite, wood, glass, etc together with the polypropylene.

Chemical modification of polymers are important for at least two reasons: 1) They can be inexpensive and rapid way of obtaining new polymers without having to search for new monomers; 2) sometimes they may be the only way to synthesise intended polymers.

During the study, the grafting reaction was carried out in a Haake Thermo Rheomixer by using two rotor blades. The reaction products obtained in the grafting procedure were purified using a precipitation method and used for the measurement of grafting degree. Products was dissolved by using refluxing xylene and precipitated into acetone for the removal of the unbounded maleic anhydride. The grafting degree was determined by a non-aqueous back titration procedure.

Acid indices tests, applied to the purified products, indicated that the highest grafting degree is obtained at the highest temperatures for each initiators and at the highest weight for maleic anhydride used. Grafting degree is increased with the di-cumyl peroxide initiator amount.

The carbonyl group peaks, measured by FT-IR, for the prepared samples and for a corresponding commercial product (DuPont M613-05; maleated polypropylene) were designated at the same 1700-1800 cm^-1 interval values which characterize the existance of grafted maleic anhydride.

It was obtained from the XR-D tests, applied to polypropylene, maleic anhydride and prepared samples, that polypropylene is the PDF#45-1807 numbered isotactic polypropylene (according to device’s material library) and crystality in the prepared samples decreased more compared to polypropylene.

It was also observed from the Scaning Electron Microscopy (SEM) results of prepared samples that the mixture is homogenous and it’s structure is bulk not pourous

BAYGIN Ajda ,

Danışman : Prof.Dr.İsmail BOZ

Anabilim Dalı : Kimya Mühendisliği

Programı (Varsa) : Proses ve Reaktör Tasarımı

Mezuniyet Yılı : 2006

Tez Savunma Jürisi : Prof.Dr.İsmail BOZ (Danışman)

Prof.Dr.M.Ali GÜRKAYNAK

Prof.Dr.Ahmet KAŞGÖZ

Prof.Dr.Süleyman TANYOLAÇ

Prof.Dr.Saadet PABUCCUOĞLU