Özlem ERİNÇ, Hakan ERİNÇ, Behiç MERT, Ayşe ÖZBEY

LİTYUM KLORİT/DİMETİLASETAMİT ORTAMINDA NANOSELÜLOZUN ASETİK ANHİDRİT VE FARKLI YAĞ ASİTLERİ İLE ESTERİFİKASYONUNUN OPTİMİZASYONU

Sunulan bu çalışmada buğday kepeği, mısır koçanı ve ayçiçeği tablasından mikro-akışkan tekniği kullanılarak nanolifler elde edildikten sonra farklı zincir uzunluklarına sahip yağ asitleri (C6, C12, C18, C18:1) ile farklı derecelerde esterleştirilmesinin optimizasyonu yapılmıştır. İlk olarak, selülozik materyal NaOH ile muamele edildi ve daha sonra nano-selüloz lifi elde etmek için kolloid değirmen ve mikro akışkanlaştırıcıda öğütüldü. Bu liflerde selüloz, lignin ve su tutma kapasitesi analizleri yapılmıştır. Örneklerin selüloz içeriği arttıkça su tutma kapasitelerinin arttığı belirlendi. Bu lifler, farklı esterleşme derecelerinde nanoselüloz-yağ asidi esterleri elde etmek için farklı yağ asitleri ile esterleştirildi. Bu sayede, farklı hidrofilik ve lipofilik gruplara sahip nano-selüloz yağ asidi esterleri elde edildi (esterleşme dereceleri 0,41-2,99). Reaksiyon süresinin ve kullanılan yağ asidi miktarının arttırılması, esterleşme reaksiyonunun yüksek oranda gerçekleşmesini sağladı. Maksimum esterleşme derecesine sahip ürünler, 90°C'de 300 dakika sonunda anhidroglükoz birimi başına ortalama 2.45 asetil grubu ve 0.55 yağ asidi olarak elde edildi. Sonuç olarak, selülozun farklı yağ asitleri ve asetik anhidrit ile DMAc/LiCl ortamında farklı derecelerde esterleştirilmesi sağlandı.

Anahtar Kelimeler:

nanoselüloz, esterifikasyon, yağ asitleri, asetik anhidrit

OPTIMIZATION OF NANOCELLULOSE ESTERIFICATION WITH DIFFERENT FATTY ACIDS AND ACETIC ANHYDRIDE IN LITHIUM CHLORIDE/DIMETHYLACETAMIDE MEDIUM

In this study, nano fibers were obtained from wheat bran, corn cob and sunflower receptacle by using micro-fluidization and then esterified with fatty acids (C6, C12, C18, C18:1) in different degrees of substitution. Firstly, cellulosic material was treated with NaOH and then milled through the colloid mill and micro-fluidizer to obtain nano-cellulose fiber. Cellulose, lignin and water holding capacity analyzes were made in these fiber. It was determined that as the cellulose content of the samples increased, their water holding capacity increased. These fibers were esterified with different fatty acids in different degrees of substitution to obtain nanocellulose-fatty acid esters. In this way, nanocellulose-fatty acid esters with different hydrophilic and lipophilic groups were obtained (degrees of substitution 0,41-2,99). Increasing the reaction time and increasing the amount of fatty acid used ensured that the esterification reaction took place at a high rate. Products with the maximum degree of esterification were obtained after 300 minute at 90°C with an average of 2.45 acetyl groups and 0.55 fatty substituents per anhydroglucose unit. As a result, cellulose was esterified with different fatty acids and acetic anhydride in DMAc/LiCl medium at different degrees.

Keywords:

nanocellulose, esterification, fatty acids, acetic anhydride,

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