Kademeli kimyasal ve mekanik ön işlemlerden geçirilmiş selülozik liflerle güçlendirilen CMC bazlı kopolimer hidrojellerin performans özelliklerinin değerlendirilmesi: Ilımlı alkali oksidasyon uygulaması

Yıl 2025, Cilt: 21 Sayı: 1, 172 - 192, 30.06.2025

Asena Damla Büyüküstün , Esat Gümüşkaya , Emir Erişir

https://doi.org/10.58816/duzceod.1624349

Öz

Bu çalışmada, selülozun hidrojelin performans özelliklerinde yan etkilerini azaltmak için selüloza mekanik rafinasyon ve alkalin oksidasyon ön işlemleri uygulanmıştır. H2O2 ile 80°C'de ılımlı oksidasyonun yanında, mekanik işlemler PFI veya supermasscolloider ile gerçekleştirilmiştir. Hidrojel üretiminde çapraz bağlayıcı olarak epiklorohidrin ve sitrik asidin etkinliği ayrı ayrı incelenmiştir. Üretilen hidrojellerin sıvı emme kapasitesi, su alma ve şişme oranları üzerinden değerlendirilmiştir. Hidrojellerin yapısal, morfolojik ve termal özellikleri FTIR, SEM ve DSC ile belirlenmiştir. IR spektraları, çapraz bağlayıcılar ile hidrojel sentezinin başarılı olduğunu göstermiştir. %10 selüloz içeren ve sitrik asit ile çapraz bağlanmış hidrojeller başlangıç kütlesinin 50 katına kadar sıvı absorbe etmesine rağmen, epiklorohidrin ile üretilen örneklerin performansının daha üstün olduğu görülmüştür. SEM görüntüleri, sitrik asit ile sentezlenen örneklerde gözenekliliğin azaldığını ve yüzey kapalılığının arttığını bu durumunda difüzyon ve absorpsiyon kapasitesinde azalmayla sonuçlandığı değerlendirilmiştir.

Anahtar Kelimeler

Hidrojel , CMC , alkali oksidasyon , süpermaskolloider rafinasyonu , PFI rafinasyonu

Etik Beyan

Bu çalışmada, bilimsel araştırma ve yayın etiğine uygun hareket edilmiştir. Araştırma sırasında elde edilen veriler, gerçeği yansıtmaktadır ve hiçbir şekilde yanıltıcı veya manipülatif bir işlem yapılmamıştır. Çalışmada, herhangi bir çıkar çatışması bulunmamaktadır. Çalışmanın yalnızca kontrol örnekleri (2 grup veri) ile ilgili olan verileri daha önce yapılan diğer çalışmalarda kullanılmıştır. Geriye kalan 10 grup örneğe ait veriler ilk defa bu çalışma kapsamında değerlendirmeye tabi tutulmuştur. Kontrol grubu örneklerine ait verilerin kullanıldığı ilgili çalışma Drewno isimli dergiden kabul almış ancak henüz basılmamıştır.

Destekleyen Kurum

TÜBİTAK

Proje Numarası

215O313

Teşekkür

Bu çalışma için sağlamış olduğu finansal destek nedeniyle yazarlar Türkiye Bilimsel ve Teknolojik Araştırmalar Kurumu (TÜBİTAK)'na teşekkürlerini sunmaktadır.

The Evaluation of Performance Properties of CMC-Based Copolymer Hydrogels Reinforced with Cellulosic Fibers Subjected to Stepwise Chemical and Mechanical Pretreatments: Moderate Alkaline Oxidation Treatment

Öz

In this study, mechanical refining and alkaline oxidation pretreatments were applied to cellulose reducing the side effect of it on hydrogel performance. In addition to moderate oxidation with hydrogen peroxide at 80°C, mechanical treatment was performed using PFI or supermasscolloider. The effectiveness of epichlorohydrin and citric acid as crosslinkers for hydrogel formation was investigated separately. The liquid absorption capacity, water uptake and swelling ratios of the produced hydrogels were measured and evaluated. The structural, morphological and thermal properties of the hydrogels were analyzed using FTIR, SEM and DSC. IR spectrum revealed that the interactions with both crosslinkers were effective. Although hydrogels with 10% cellulose ratio and cross-linked with citric acid can absorb liquid up to 50 times the initial mass, the overall performance of the samples produced with epichlorohydrin was found to be superior. SEM images showed that the porosity of the hydrogel decreased and the surface closedness increased in the samples with citric acid. These phenomena were considered as a reduction in diffusion of liquids and absorption capacity.

Anahtar Kelimeler

Hydrogel , CMC , alkaline oxidation , supermasscolloider refining , PFI refining

Destekleyen Kurum

TÜBİTAK

Proje Numarası

215O313

Kaynakça

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