Akrilonitril İçeren Kopolimer Sentezi ve Kopolimerin Magnezyum İyonları Adsorpsiyonu

Yıl 2024, , 879 - 890, 18.06.2024

Ergül Meyvacı , Temel Öztürk

https://doi.org/10.31466/kfbd.1446325

Öz

Serbest radikal polimerizasyonu yoluyla akrilonitril ve metil metakrilat monomerleri kullanılarak 2,2'-azobisizobütironitril varlığında poli(akrilonitril-ko-metil metakrilat) [P(AN-MMA)] kopolimeri elde edildi. Sentezlenen kopolimerin yüzeyi sodyum hidroksit çözeltisinde hidrolize edildi. P(AN-MMA) kopolimer yüzeyindeki nitril grupları (-C≡N), konjuge imin gruplarına (-C=N-) dönüştürüldü. Magnezyum iyonlarının adsorpsiyonunda hidrolize poli(akrilonitril-ko-metil metakrilat) [HP(AN-MMA)] kopolimeri kullanıldı. Magnezyum iyonu, adsorpsiyondan önce ve sonra Mg(NO3)2.6H2O içeren sulu bir çözelti içerisinde etilendiamintetraasetik asit ile belirlendi. HP(AN-MMA) kopolimerinin Mg2+ iyonlarına karşı adsorpsiyon kapasitesi 1,27 mmol.g-1 (pH=4,5) olarak bulunmuştur. Ürünün izolasyonu ve kurutulmasının ardından temel polimer karakterizasyon yöntemlerinden olan 1H-nükleer manyetik rezonans spektroskopisi, Fourier transform-kızılötesi spektroskopisi ve termogravimetrik analiz ile yapısal ve termal karakterizasyonu belirlendi. Magnezyum iyonu adsorpsiyonu sonrasında gelişen ortalama yüzey pürüzlülüğü (Ra) değerleri atomik kuvvet mikroskobu analizi ile incelenmiştir. Magnezyum iyonu adsorpsiyonu ile Ra değeri 136 nm’den 354 nm’ye çıkmıştır.

Anahtar Kelimeler

Magnezyum İyon Adsorpsiyonu, Hidrolize Poli(Akrilonitril-ko-Metil Metakrilat) Kopolimeri, Atomik Kuvvet Mikroskobu, Serbest Radikal Polimerizasyonu

Acrylonitrile-Containing Copolymer Synthesis and Magnesium Ions Adsorption of the Copolymer

Öz

Poly(acrylonitrile-co-methyl methacrylate) [P(AN-MMA)] copolymer was obtained in the presence of 2,2'-azobisisobutyronitrile by using acrylonitrile and methyl methacrylate monomers via free radical polymerization. The surface of the synthesized copolymer was hydrolyzed in sodium hydroxide solution. Nitrile groups (-C≡N) on the P(AN-MMA) copolymer surface were converted into conjugated imine groups (-C=N-). Hydrolyzed poly(acrylonitrile-co-methyl methacrylate) [HP(AN-MMA)] copolymer was used in the adsorption of magnesium ions. Magnesium ion was determined with ethylenediaminetetraacetic acid in a water solution containing Mg(NO3)2.6H2O before and after adsorption. The adsorption capacity of the HP(AN-MMA) copolymer against Mg2+ ions was found to be 1.27 mmol.g-1 (pH=4.5). After isolation and drying of the product, its structural and thermal characterization was determined by 1H-nuclear magnetic resonance spectroscopy, Fourier transform-infrared spectroscopy and thermogravimetric analysis, which are the basic polymer characterization methods. The average surface roughness (Ra) values developed after magnesium ion adsorption were investigated by atomic force microscopy analysis. With magnesium ion adsorption, the Ra value increased from 136 nm to 354 nm.

Anahtar Kelimeler

Magnesium Ion Adsorption, Hydrolyzed Poly(Acrylonitrile-co-Methyl Methacrylate) Copolymer, Atomic Force Microscopy, Free Radical Polymerization

Kaynakça

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