Alifatik Ester-Eter Yapılı Yeni Makromonomerlerin Sentezi ve “Dolaylı Aşılama” Stratejisinde Kullanımı

Yıl 2024, Cilt: 14 Sayı: 3, 1471 - 1485, 15.09.2024

Efkan Çatıker , Temel Öztürk

https://doi.org/10.31466/kfbd.1475630

Öz

Bu çalışmada, poli(akrilik asit-g-hidroksietil akrilat) (PAA-g-PHEA) ve poli(akrilik asit-g-hidroksipropil akrilat) (PAA-g-PHPA) aşı kopolimerlerinin serbest radikal polimerizasyonu (SRP) yöntemiyle sentezleri gerçekleştirildi. Bunun için ilk aşamada, 2-hidroksietil akrilat (HEA) ve 2-hidroksipropil akrilat (HPA) kullanılarak baz katalizli hidrojen transfer polimerizasyonu (HTP) metoduyla sırasıyla poli(2-hidroksietil akrilat) (PHEA) ve poli(2-hidroksipropil akrilat) (PHPA) elde edildi. Elde edilen bu yapılar zincir uçlarında vinil grupları barındırdığından ikinci aşamada makromonomer olarak kullanıldılar. Bu aşamada “dolaylı aşılama” (“grafting through”) yaklaşımı ile akrilik asit ve bu makromonomerlerin ayrı ayrı serbest radikal polimerizasyonuna (SRP) uğratılmasıyla PAA-g-PHEA ve PAA-g-PHPA aşı kopolimeri elde edildi. Sentezlenen her iki ürünün yapısal ve termal karakterizasyonu en temel spektroskopik ve termal analiz yöntemlerinden olan 1H-NMR, FT-IR ve TGA yöntemleri ile sağlandı. SRP verimlerinin neredeyse %100 olması, nihai ürünlerin 1H-NMR spektrumlarında vinil uç grubuna ait sinyallerin olmaması ve TGA termogramlarında her iki bileşene ait kütle kayıp yüzdesinin neredeyse eşit olması uygulanan sentez stratejisinin başarısını ortaya koymaktadır.

Anahtar Kelimeler

Serbest radikal polimerizasyonu, Hidrojen transfer polimerizasyonu, Aşı kopolimer, “Dolaylı aşılama” stratejisi, Makromonomer

Etik Beyan

Yazarların Katkısı Tüm yazarlar çalışmaya eşit katkıda bulunmuştur. Çıkar Çatışması Beyanı Yazarlar arasında herhangi bir çıkar çatışması bulunmamaktadır. Araştırma ve Yayın Etiği Beyanı Yapılan çalışmada araştırma ve yayın etiğine uyulmuştur.

Synthesis of Novel Macromonomers with Aliphatic Ester-ether Backbone and Their Use in “Grafting Through” Strategy

Öz

In this study, poly(acrylic acid-g-hydroxyethyl acrylate) (PAA-g-PHEA) and poly(acrylic acid-g-hydroxypropyl acrylate) (PAA-g-PHPA) graft copolymers were synthesized by the free-radical polymerization (SRP) method. For this, in the first step, poly(2-hydroxyethyl acrylate) (PHEA) and poly(2-hydroxypropyl acrylate) (PHPA) were obtained by base-catalyzed hydrogen transfer polymerization (HTP) method using 2-hydroxyethyl acrylate (HEA) and 2-hydroxypropyl acrylate (HPA) as monomers, respectively. Since these obtained structures contained vinyl groups at the chain ends, they were used as macromonomers in the second stage. At this stage, PAA-g-PHEA and PAA-g-PHPA graft copolymers were obtained by subjecting acrylic acid and these macromonomers separately to free radical polymerization (SRP) with the "grafting through" approach. Structural and thermal characterization of both synthesized products was achieved by 1H-NMR, FT-IR, and TGA methods, which are among the most basic spectroscopic and thermal analysis methods. The fact that SRP yields are almost 100%, there are no signals of the vinyl end-group in the 1H-NMR spectra of the final products, and the mass loss values of both components are almost equal in the TGA thermograms reveal the success of the applied synthesis strategy.

Anahtar Kelimeler

Free radical polymerization, Hydrogen transfer polymerization, Graft copolymer, “Grafting through” strategy, Macromonomer

Kaynakça

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