Grafting and Characterization of Ethylene Glycol Dimethacrylate on Sodium Alginate, Chitosan and Polyvinyl Alcohol Using Different Initiators

Abstract

In recent years, the usage areas of new graft copolymers synthesized from polymers have increased. Graft copolymerization is performed to reduce the weaknesses of polymers and expand their usage area. Graft copolymers are notable for their potential applications in wastewater treatment, biomedical, pharmaceutical, and nanomedicine fields. In our study, the free radical graft copolymerization method was used to eliminate the weak properties of sodium alginate (ALG), chitosan (CHI) and polyvinyl alcohol (PVA) polymer. By grafting ethylene glycol dimethacrylate (EGDMA) monomer onto the polymers, sodium alginate-graft-poly(ethylene glycol dimethacrylate) (ALG-g-PEGDMA), chitosan-graft-poly(ethylene glycol dimethacrylate) (CHI-g-PEGDMA), polyvinyl alcohol-polymer-poly(ethylene glycol dimethacrylate) (PVA-g-PEGDMA) graft copolymer was synthesized. The synthesis of graft copolymers was carried out using cerium ammonium nitrate (CAN), ammonium persulfate (APS) and benzoyl peroxide (BPO) initiators in a nitrogen gas atmosphere at temperatures suitable for the initiators. The graft percentage and grafting efficiency of graft copolymers synthesized with different initiators were calculated from the mass increase. The lowest grafting results were obtained with the CAN starter. The grafting percentage (15%) and grafting efficiency (6%) of PVA-g-PEGDMA graft copolymer synthesized with CAN initiator were found. The highest grafting results were obtained with the BPO starter. Grafting percentage (116%) and grafting efficiency (30%) of ALG-g-PEGDMA graft copolymer synthesized with BPO initiator were found. The synthesized graft copolymers were characterized by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA/dTG) methods. The glass transition temperature (Tg) of the copolymers were determined.

Keywords

• Sodium alginate
• Chitosan
• Polyvinyl alchol
• Ethylene glycol dimethacrylate
• Graft copolymerization

Etilen Glikol Dimetakrilatın, Sodyum Aljinat, Kitosan ve Polivinil Alkol Üzerine Farklı Başlatıcılar Kullanılarak Aşılanması ve Karakterizasyonu

Öz

Son yıllarda polimerlerden sentezlenen yeni aşı kopolimerlerin kullanım alanları artmaktadır. Polimerlerin zayıf yönle azaltmak ve kullanım alanını genişletmek için aşı kopolimerizasyon yapılmaktadır. Aşı kopolimerler atık su arıtma, biyomedikal, farmasötik, nanotıp alanlarındaki potansiyel uygulamaları nedeniyle dikkat çekicidir. Çalışmamızda sodyum aljinat (ALG), kitosan (CHI) ve polivinil alkol (PVA) polimerinin zayıf özelliklerini bertaraf etmek için serbest radikalik aşı kopolimerizasyon yöntemi kullanıldı. Polimerler üzerine etilen glikol dimetakrilat (EGDMA) monomeri aşılanarak sodyum aljinat-aşı-poli(etilen glikol dimetakrilat) (ALG-g-PEGDMA), kitosan-aşı-poli(etilen glikol dimetakrilat) (CHI-g-PEGDMA) ve polivinil alkol-aşı-poli(etilen glikol dimetakrilat) (PVA-g-PEGDMA) aşı kopolimeri sentezlendi. Aşı kopolimerlerin sentezi, seryum amonyum nitrat (CAN), amonyum persülfat (APS) ve benzoil peroksit (BPO) başlatıcıları kullanılarak azot gazı atmosferinde başlatıcılara uygun sıcaklıklarda gerçekleştirildi. Farklı başlatıcılarla sentezlenen aşı kopolimerlerin aşı yüzdesi ve aşılama verimi kütle artışından hesaplandı. En düşük aşılama sonuçları CAN başlatıcısında elde edildi. CAN başlatıcısı ile sentezlenen PVA-g-PEGDMA aşı kopolimerin aşı yüzdesi (%15) ve aşılama verimi (%6) bulundu. En yüksek aşılama sonuçları BPO başlatıcısı ile elde edildi. BPO başlatıcısı ile sentezlenen ALG-g-PEGDMA aşı kopolimerin aşı yüzdesi (%116) ve aşılama verimi (%30) bulundu. Sentezlenen aşı kopolimerler Fourier dönüşümlü kızılötesi spektroskopisi (FT-IR) ve termogravimetrik analiz (TGA/dTG) yöntemleri ile karakterize edildi. Kopolimerlerin camsı geçiş sıcaklıkları (Tg) belirlendi.

Anahtar Kelimeler

• Sodyum aljinat
• Kitosan
• Polivinil alkol
• Etilen glikol dimetakrilat
• Aşı kopolimerizasyon

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