Poli(β-Propiyolakton)-b-Poli(Metil Metakrilat) Üç Kollu Blok Kopolimerinin Atom Transfer Radikal Polimerizasyonuyla Sentezi ve Karakterizasyonu

Year 2023, , 882 - 893, 15.09.2023

Ergül Meyvacı , Efkan Çatıker , Temel Öztürk

https://doi.org/10.31466/kfbd.1260147

Cited By: 2

Abstract

Son uçları dibromlanmış poli(β-propiyolakton), sırasıyla β-propiyolaktonun halka açma polimerizasyonu ve poli(β-propiolakton)un dibrominasyonu yoluyla hazırlandı. Poli(β-propiyolakton)-b-poli(metil metakrilat) üç kollu blok kopolimer sentezi, metil metakrilatın bromür uç gruplarına sahip poli(β-propiyolakton) üzerine atom transferiyle radikal polimerizasyonuyla elde edildi. Polimerlerin karakterizasyonu, 1H-NMR, DSC, TGA ve GPC kullanılarak gerçekleştirildi. Son ürünün GPC analizi, 9353 g.mol-1 ortalama molekül ağırlığına karşılık gelen bir tek dağılımlı eğri gösterdi. Üç kollu blok kopolimerin TGA analizi, 212 oC ve 411 oC'de sırasıyla β-propiyolakton ve metil metakrilat bloklarına karşılık gelen iki basamaklı bozunma eğrisi sergiledi. Poli(β-propiolakton)-b-poli(metil metakrilat) üç kollu blok kopolimerinin DSC analizi, -22.02 oC ve 86.55 oC'de sırasıyla β-propiyolakton ve metil metakrilat bloklarına karşılık gelen iki camsı geçiş sıcaklığı gösterdi. Spektroskopik ve termal analizler, üç kollu blok kopolimerin sırasıyla halka açma polimerizasyonu ve atom transfer radikal polimerizasyonu yoluyla başarılı bir şekilde sentezlendiğini kanıtladı.

Keywords

Atom Transfer Radikal Polimerizasyonu, Makro Başlatıcı, Poli(β-propiyolakton), Halka Açılması Polimerizasyonu, Üç Kollu Blok Kopolimer.

Synthesis and Characterization of Poly(β-Propiolactone) b-Poly(methyl methacrylate) Tri-arm Block Copolymer Using Atom Transfer Radical Polymerization

Abstract

Terminally dibrominated poly(β-propiolactone) was prepared through sequentially ring-opening polymerization of β-propiolactone and dibromination of the former product. Synthesis of poly(β-propiolactone)-b poly(methyl methacrylate) tri-arm block copolymer was achieved by atom transfer radical polymerization of methyl methacrylate onto the poly(β-propiolactone) with bromide end groups. The characterization of the polymers was carried out using 1H-NMR, DSC, TGA, and GPC. GPC analysis of the final product resulted in an unimodal curve corresponding to the weight average molecular weight of 9353 g.mol-1. TGA analysis of the tri-arm block copolymer exhibited a two-step decomposition curve corresponding to the β-propiolactone and the methyl methacrylate blocks at 212 oC and 411 oC, respectively. DSC analysis of poly(β-propiolactone)-b poly(methyl methacrylate) tri-arm block copolymer showed two glass temperatures corresponding to the β-propiolactone and the methyl methacrylate blocks at -22.02 oC and 86.55 oC, respectively. The spectroscopic and thermal analyses proved that the tri-arm block copolymer was successfully synthesized through ring-opening polymerization and atom transfer radical polymerization, respectively.

Keywords

Atom Transfer Radical Polymerization, Macro Initiator, Poly(β-Propiolactone), Ring-Opening Polymerization, Tri-Arm Block Copolymer.

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