CMC Esaslı Hidrojel Üretimi için Fenton ile Oksitlenmiş ve Mekanik Rafinasyona Uğratılmış Selüloz ile Sürdürülebilir Takviyesi

Öz

Fenton oksidasyonu mikro ve nano ölçekli selüloz üretimi öncesinde sarf edilen enerji miktarını azaltmasıyla son yıllarda dikkat çeken konu başlıklarından biri olmuştur. Bu kimyasal ön işlem sayesinde lifler mekanik prosesler süresince daha kolay işlenirken, aynı zamanda liflerin yüzey alanlarının arttığı bulunmuştur. Bu çalışmada karboksimetil selüloz (KMS) esaslı hidrojel üretiminde katkı maddesi olarak kullanılan selülozun fenton oksidasyonu ile ön işleme tabi tutulmasının hidrojel özelliklerine olan etkileri araştırılmıştır. Selüloza ayrıca PFI veya kolloid değirmenleri ile mekanik ön işlemden de geçirilmiştir. FTIR, DSC ve SEM ile karakterize edilen hidrojellerin çeşitli sıvılar içerisindeki şişme performansları karşılaştırılmıştır. Ayrıca hidrojel üretiminde iki farklı tip sitrik asit (SA) ve epiklorohidrin (EKH) çapraz bağlayıcı kullanılmış, çapraz bağlayıcıların da hidrojel üzerindeki etkileri değerlendirilmiştir. Her iki çapraz bağlayıcı ile hidrojel üretimi başarı ile sonuçlanmış, çapraz bağlayıcı tipine göre FTIR spektrumlarında doğrulama yapılmıştır. Uygulanan fenton oksidasyonu sayesinde, hidrojelin şişme performansına kullanılan selülozdan kaynaklanan olumsuz etkiler sınırlandırılmıştır. Analizler sonucunda selüloz içermesine rağmen hidrojelin kendi kütlesinin 58 katına kadar sıvı absorplayabildiği belirlenmiştir.

Anahtar Kelimeler

• Fenton
• hidrojel
• PFI
• selülozun oksidasyonu
• süpermasskolloider

Sustainable Reinforcement of CMC Based Hydrogels with Fenton Oxi-dized and Mechanically Refined Cellulose

Abstract

Fenton oxidation has emerged as one of the most prominent topics in recent years due to its ability to reduce the amount of energy consumed in the production of micro- and nano-scale cellulose. This chemical pretreatment enables fibers to be processed more easily during mechanical processes while also increasing their surface area. In this study, the effects of pre-treating cellulose, used as an additive in the production of carboxymethyl cellulose (CMC)-based hydrogels, with Fenton oxidation on the properties of the hydrogels were investigated. The cellulose was also subjected to mechanical pre-treatment using PFI or colloid mills. The hydrogels characterized by FTIR, DSC, and SEM were compared the swelling performance in various liquids. Additionally, two different types of cross-linkers (citric acid and epichlorohydrin) were used in hydrogel production, and their effects on the hydrogels were evaluated. Hydrogel production was successfully achieved with both cross-linkers, and FTIR instrument was verified it. Thanks to the applied Fenton oxidation, the negative effects on the hydrogel's swelling performance caused by the cellulose were limited. The analyses revealed that the hydrogel could absorb liquid up to 58 times its own mass despite containing cellulose.

Keywords

• Fenton
• hydrogel
• oxidation of cellulose
• PFI
• supermasscolloider.

Kaynakça

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