KARBOKSİMETİLLENMİŞ PAMUKLU KUMAŞLARDA SUBSTİTÜSYON DERECESİNİ TESPİT ETMEK İÇİN KOLAY VE HASSAS BİR YÖNTEM

Karboksimetil selüloz (CMC), gıda, farmasötik ve kişisel bakım, kimyasal, sondaj sıvıları, kâğıt ve tekstil gibi pek çok endüstride kullanılan yaygın bir selüloz eteridir. Sübstitüsyon derecesi (DS) karboksimetil selülozun nihai özelliklerini etkileyen en önemli faktördür ve bu nedenle kullanım öncesi hassas şekilde ölçülmelidir. Karboksimetil selüloz toz halde olduğunda sübstitüsyon derecesini tespit etmek için kullanılan pek çok yöntem mevcuttur, ancak kumaş üzerinde tespit ters titrasyon ile sınırlıdır. Konvansiyonel titrasyon esaslı yöntemler pek çok kimyasalın kullanılması ve uzun süren titrasyon işlemleri gerektirmektedir ve bu yöntemle elde edilen sonuçların doğruluğu için işlemi yapan operatörün yüksek seviyede tecrübeli olmasına gerek duyulmaktadır. Bu nedenle, yüksek tekrarlanabilirliğe sahip ve uygulanması kolay alternatif yönteme ihtiyaç duyulmaktadır. Bu çalışmada, karboksimetil selülozun sübstitüsyon derecesinin tespiti için Metilen Mavisi isimli iyi bilinen bir boyarmadde ile lekeleme, kısa süreli durulama ve kurutmanın ardından spektrofotometre ile K/S değerinin tespitini içeren hızlı bir yöntem önerilmektedir. Hassasça yürütülen bir titrasyon prosedürü de çalışılmıştır. Yeni önerilen yöntemle elde edilen sonuçların titrasyon yöntemiyle elde edilenlerle yüksek korelasyona sahip olduğu gösterilmiştir. Titrasyon ile kıyaslandığında, bu alternatif yöntemin uygulanması daha kolaydır, görsel kanıt sunmaktadır ve istendiği takdirde harcanan kimyasallar ve boyarmadde ilave edilerek boyama çözeltisinin tekrar kullanımı mümkündür.

Anahtar Kelimeler:

Karboksimetil selüloz, sübstitüsyon derecesi, karboksimetilasyon, titrasyon, metilen mavisi

AN EASY AND ACCURATE METHOD FOR DETERMINING DEGREE OF SUBSTITUTION ON CARBOXYMETHYLATED COTTON FABRIC

Carboxymethyl cellulose (CMC) is a common cellulose ether used in many industries including food, pharmaceuticals and personal care, chemicals, drilling fluids, paper as well as textile. The degree of substitution (DS) affects final CMC properties primarily, and thus it must be precisely measured before use. There are various methods for determination of DS when CMC is in powder form, however, methods for determination on the fabric are limited to back titration. Conventional titrimetric methods include reactions with a variety of chemicals and timely titration practices whose accuracy depend mainly on high level of expertise of the operator. An easy-to-apply alternative method with high repeatability is thus needed. In this study, a quick method comprising staining with a well-known dyestuff, namely Methylene Blue, followed by short rinsing-drying, and K/S measurement with spectrometer is offered for determination of degree of substitution of CMC. A precisely followed titration procedure is also carried out. It is shown that the results of newly offered method correlates very well with those of titration method. This alternative method is easier to apply, offers visual evidence and dyeing solution can be used again by addition of expended chemicals and dyestuff, if desired.

Keywords:

Carboxymethyl cellulose, degree of substitution, carboxymethylation, titration, methylene blue,

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