Copolymerization of N- 2-acetyl–benzofuran-3-yl methacrylamide monomer with styrene : synthesis, characterization and determination of monomer reactivity ratios

Year 2018, Volume: 7 Issue: 2, 79 - 87, 01.07.2018

Esra Barım Mustafa Değirmenci Cumhur Kırılmış

Abstract

In this study, the copolymerization of N- 2-acetyl–benzofuran-3-yl methacrylamide NABM monomer with styrene St was studied. The copolymerization reaction between NABM and St monomers was carried out in 1,4-dioxane solution at 70 oC using azobisi sobutyronitrile AIBN as initiator via free radical polymerization method. The structures of the obtained copolymers having different monomer compositions were characterized by FT-IR and NMR techniques. The compositions of the copolymers were calculated by 1HNMR spectra. The average-molecular weights of the polymers were found from Gel Permeation Chromatography GPC . The monomer reactivity ratios were calculated according to the general copolymerization equation using Kelen-Tüdös K-T and Finemann-Ross F-R linearization methods. The thermal behaviours of copolymers with various compositions were investigated by differential scanning calorimetry DSC and thermogravimetric analysis TGA . Thermogravimetric analysis of the copolymers reveals that the thermal stability of the copolymers increases with an decrease in the mole fraction of NABM in the copolymers. Glass transition temperatures of the copolymers were found to increase with an increase in the mole fraction of NAMB in the copolymers. The reactivity ratios of copolymers indicated a tendency toward alternative copolymerization.

Keywords

Benzofurane, methacrylamide, copolymerization, free radical polymerization, monomer reactivity ratio

N- 2-asetil–benzofuran-3-il metakrilamit monomerinin stiren ile kopolimerizasyonu: sentez, karakterizasyon ve reaktivite oranlarının belirlenmesi

Abstract

Bu çalışmada N- 2-asetil–benzofuran-3-il metakrilamit NABM monomeri ile stiren St monomerinin kopolimerizasyonu çalışıldı. NABM monomerinin, St monomeri ile kopolimerizasyonu serbest radikalik polimerizasyon yöntemi ile başlatıcı olarak azobisizo bütironitril AIBN kullanılarak, 1,4-dioksan çözücüsü içerisinde 70 oC sıcaklıkta gerçekleştirildi. Elde edilen farklı monomer bileşimlerine sahip kopolimerlerin yapıları FT-IR ve NMR teknikleriyle karakterize edildi. Kopolimerlerin bileşimi, 1H-NMR spektrumlarından tayin edildi. Polimerlerin ortalama molekül ağırlıkları GPC ölçümleriyle belirlendi. Monomer reaktivite oranları, Kelen-Tüdös K-T ve Finemann-Ross F-R metotlarında kullanılan genel kopolimerizasyon eşitliğine göre hesaplandı. Farklı bileşimlere sahip kopolimerlerin termal davranışları, diferansiyel taramalı kalorimetre DSC ve termogravimetrik analiz TGA ile incelendi. Kopolimerin termogravimetrik analizleri, kopolimerlerdeki NABM’nin mol fraksiyonun artması ile termal kararlılığının azaldığını ortaya koydu. Kopolimerlerin camsı geçiş sıcaklığının, kopolimerlerdeki NABM mol fraksiyonun artması ile arttığı bulundu. Kopolimerlerin reaktivite oranları, kopolimerizasyonun alternatif eğilimli olduğunu gösterdi.

Keywords

Benzofuran, metakrilamit, Serbest radikalik polimerizasyon, kopolimerizasyon, monomer reaktivite oranı

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