Borik Asit-Gliserin’ in Reolojik Özelliklerinin Deneysel Olarak İncelenmesi

Öz

Bu çalışmada kütlece %0.1-1 bölüntülerde gliserin içerisinde hazırlanmış borik asit solüsyonların reolojik özellikleri incelenmiştir. Reolojik ölçümler stress kontrollü reometre kullanılarak 20-50 oC sıcaklıklarda gerçekleştirilmiştir. Reolojik ölçümler, lineer ve lineer olmayan viskoelastisite ölçümleri olmak üzere iki farklı yöntem ile yapılmıştır. Doğrusal olmayan viskoelastik ölçümlerde solüsyonun kayma hızına karşı viskozitesinin değişimi, hem farklı kütle fraksiyonları için hem de sabit bir kütle fraksiyonunda farklı sıcaklıklar için incelenmiştir. Diğer bir deneysel aşamada ise frekans bağımlı depolama G' ve kayıp modülü G'', küçük salınım kayma gerilimi altında ölçülerek akışkanın elastik davranışı belirlenmiştir. Farklı kütlesel fraksiyonlarda hazırlanan örneklerin detaylı reolojik analizleri sonucunda; tüm solüsyonların Newton kuralına uyan akışkan davranışı gösterdiği belirlenmiştir. Ayrıca artan sıcaklıkla solüsyonların viskozitesinin azaldığı açıkça görülmüştür. Gerçekleştirilen doğrusal reolojik ölçümler sonucunda G''> G' olduğundan, verilen frekans aralığında solüsyonların viskoz davranış özelliği gösterdiği gözlenmiştir.

Anahtar Kelimeler

• Reoloji
• borik asit
• gliserin

Experimental Investigation of Rheological Properties of Boric Acid-Glycerin

Öz

In this study, the rheological properties of boric acid solutions prepared in glycerine in 0.1-1% aliquots by mass were investigated. Rheological measurements were carried out at 20-50 oC using a stress-controlled rheometer. Rheological measurements were made with two different methods, linear and non-linear viscoelasticity measurements. The variation of viscosity of the solution versus shear rate in nonlinear viscoelastic measurements was investigated both for different mass fractions and for different temperatures at a constant mass fraction. In another experimental step, the elastic behavior of the fluid was determined by measuring frequency dependent storage G' and loss modulus G'' under small swing shear stress. As a result of detailed rheological analysis of the samples prepared in different mass fractions; It was determined that all solutions showed fluid behavior in accordance with Newton's rule. It was also clearly seen that the viscosity of the solutions decreased with increasing temperature. As a result of the linear rheological measurements performed, it was observed that the solutions showed viscous behavior in the given frequency range, since G'' > G'.

Anahtar Kelimeler

• Rheology
• boric acid
• glycerin

Kaynakça

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