Bu çalışmada, kontrollü/yaşayan radikal polimerizasyon tekniklerinden biri olan tersinir katılma -bölüşme zincir transfer polimerizasyon (reversible addition - fragmentation chain transfer polymerization - RAFT) tekniği kullanılarak hava üflenmiş keten yağının stirenlenmesi gerçekleştirilmiştir. RAFT ajanı (Zincir transfer ajanı) olarak Fenasil Morfolin Ditiokarbamat (PMDC) kullanılmıştır ve polimerizasyonda uygun miktarı belirlenmiştir. RAFT ajarıı miktarı, peroksit gruplarının oluşturacağı serbest radikaller esas alınarak hesaplanmıştır. Polimerizasyonda, değişen miktarlarda PMDC kullanılarak, miktarın ürün özellikleri üzerine etkisi incelenmiştir. . Elde edilen sonuçlara göre, ortamda oluşan serbest radikallere ekivalent miktarda PMDC kullanıldığında polimerizasyonun kontrol edilebildiği ve dar molekül ağırlığı dağılımının sağlandığı görülmüştür. Ekivalent miktardan daha fazla PMDC kullanıldığında ise polidispersitenin daha da düştüğü gözlenmiştir. Elde edilen stirenlenmiş yağ örnekleri GPC ve FT-IR analizleri ile karakterize edilmiştir. Sonuç olarak RAFT polimerizasyon tekniği kullanılarak, polidisper sitesi düşük (

Triglyceride oils owe their value as raw materials for decorative and protective coatings to their ability to polymerize and cross-link or dry after they have been applied to a surface, to form tough, adherent films. In order to obtain coating material having better performance in industry, oils are modified with various methods. Among these modified methods, copolymerization of oils with vinyl monomers such as styrene occupies an important place. In the classical styrenation process, homopolystyrene formation is likely to occur. The formation of homopolystyrene is not favor in product since the presence of homopolymer leads to weak film properties. By taking this fact into account, the methods by which homopolymerization was minimized and polymer structure was controlled, were previously developed in our laboratory. As a continuation of these studies, in this study, in order to obtain styrenated oil, air blowing linseed oil was copolymerized with styrene by the controlled / living radical polymerization technique (CLRP). CLRP is particularly appealing as it not only delivers polymers having a narrow molecular weight distribution with predetermined average molecular weight but also can be performed using normal radical procedures without the stringent experimental conditions required in living ionic polymerization. The most widely used controlled radical polymerization techniques are reversible addition fragmentation chain transfer polymerization (RAFT), nitroxide mediated polymerization (NMRP) and atom transfer radical polymerization (ATRP). Among of these techniques, the RAFT polymerization has been considered a the most versatile and robust method, since it can be compatible with almost all monomers and reactions conditions that are applicable to conventional free radical polymerization. The RAFT process and its benefits are achieved simply by the addition of a suitable RAFT agent to the reaction medium.In this work, styrenated oil was obtained in three step. In the first step, the air was passed out through preheated linseed oil for 18 hours at 80 °C, thus, the peroxide groups on the oil triglyceride molecules created. Polymerization of oils is provided due to free radicals resulting in their decomposition. Peroxide value of oil was determined as 485 meq peroxide - oxygen/kg oil. In the second step, phenacyl morpholine dithiocarbamate (PMDC) was prepared in laboratory and used as RAFT agent, R and Z being phenacyl and morpholine, respectively. The structures of R and Z of the RAFT agent would exist in the chain ends of the final polymers. Thus, the end group of the polymer can be predesigned by choosing the RAFT agent with the desired structures. In the third step, air blown linseed oil was styrenated in the presence of PMDC under nitrogen atmosphere at 90 0 C. Temperature was kept constant with controlled heating. In order to investigate the effect of the RAFT agent amount on the copolymer, different amounts of the RAFT agent were used in the reaction. The characteristic properties of the samples such as molecular weight, polydispersity and molecular structure were determined by Gel Permeation Chromatography (GPC). The results show that, in the RAFT polymerization technique, when RAFT agent was used in the equivalent amount to the free radicals, products with low polydispersity were obtained while without homopolystyrene formation. Also when the amount of RAFT agent was excess than that of the equivalent to the free radicals, polydispersity became lower. In addition to these, polymer with higher molecular weight and higher conversion were obtained with increasing reaction time and polydispersity was still at low level. For all that, three peaks were observed in GPC chroma-tograms. This is the expected result since the hydroperoxides decompose to give free radicals under blowing conditions. As a result this fact, chain propagation by coupling and abstraction reactions cause different molecular weight and ultimately leads to deviation from the unimodel shape. Besides, the oil-styrene copolymer structure was assigned by means of FT - IR measurements. The FT - IR spectrum of styrenated oil showed the characteristic bands of both styrene and initial oil segment.The film properties of the resulting sample was determined according to related standards as well. Copolymer of the oil with styrene was also prepared by conventional method and this sample were used as a comparative sample. The sample obtained with RAFT polymerization technique showed better alkali and water resistance and better adhesion and the shorter drying time than the classical sample which obtained in the absence of the RAFT agent..