KİMYASAL MODİFİKASYON SONRASI TERMAL OLARAK STABİLİZE EDİLEN VİSKOZ RAYON LİFLERİN YAPISAL ANALİZİ

Kemal Şahin Tunçel

doi:10.17780/ksujes.1615990

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KİMYASAL MODİFİKASYON SONRASI TERMAL OLARAK STABİLİZE EDİLEN VİSKOZ RAYON LİFLERİN YAPISAL ANALİZİ

Öz

Bu çalışmada, viskoz rayon liflerin fosforik asitle kimyasal modifikasyonu sonrası termal stabilizasyon sürecinde meydana gelen yapısal değişimleri analiz edilmiştir. Viskoz rayon lifleri öncelikle %4’lük fosforik asit çözeltisi ile muamele edilmiş ve ardından 160°C’den 250°C’ye kadar değişen sıcaklıklarda termal olarak stabilize edilmiştir. Stabilizasyon sonrasında elde edilen numunelerin karakterizasyonunda kızılötesi spektroskopisi (FT-IR), X-ışını kırınımı (XRD), termogravimetrik analiz (TGA) ve diferansiyel taramalı kalorimetri (DSC) teknikleri kullanılmıştır. Kızılötesi spektroskopisinden elde edilen bulgular, hidroksil grupların dehidrasyonunu ve aromatik yapıların oluşumunu göstermiştir. XRD analizinde, artan sıcaklıklarla selüloz-II kristal yapısının amorf faza dönüştüğü ve 250°C’de tamamen kaybolduğu gözlenmiştir. TGA termogramları, modifikasyonun maksimum ağırlık kaybı sıcaklığını düşürdüğünü ve kömürleşme verimini %13,2’den %50’ye yükselttiğini göstermiştir. DSC analizleri, endotermik pik sıcaklığının 330°C’den 215°C’ye kaydığını ve dehidrasyon reaksiyonlarının hızlandığını göstermiştir. Fosforik asidin, selülozun ayrışma mekanizmasını değiştirerek karbonizasyon verimini artırdığı, lifleri ileri karbonizasyon süreçlerine hazırladığı ve termal olarak stabilize edilen viskoz rayonun aktif karbon lif üretimi için uygun bir öncü (precursor) olabileceği anlaşılmıştır.

Anahtar Kelimeler

STRUCTURAL ANALYSIS OF THERMALLY STABILIZED VISCOSE RAYON FIBERS AFTER CHEMICAL MODIFICATION

Abstract

In this study, the structural changes that occurred during the thermal stabilization process after chemical modification of viscose rayon fibers with phosphoric acid were analyzed. Viscose rayon fibers were first treated with 4% phosphoric acid solution and then thermally stabilized at temperatures ranging from 160°C to 250°C. Infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques were used in the characterization of the samples obtained after stabilization. The findings obtained from infrared spectroscopy showed the dehydration of hydroxyl groups and the formation of aromatic structures. In XRD analysis, it was observed that the cellulose-II crystal structure transformed into the amorphous phase with increasing temperatures and completely disappeared at 250°C. TGA thermograms showed that the modification decreased the maximum weight loss temperature and increased the char yield from 13.2% to 50%. DSC analyses showed that the endothermic peak temperature shifted from 330°C to 215°C and dehydration reactions accelerated. It was concluded that phosphoric acid increased the carbonization yield by changing the decomposition mechanism of cellulose and prepared the fibers for further carbonization processes, and it was understood that thermally stabilized viscose rayon is a suitable precursor for the production of activated carbon fiber.

Keywords

Ethical Statement

Yazar bu makalede sunulan araştırmayla ilgili herhangi bir çıkar çatışması olmadığını beyan etmektedir. Bu yazıda insan veya hayvan denekleri bulunmadığından etik onayı gerekmemektedir.

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Details

Primary Language

Turkish

Subjects

Material Characterization , Fiber Technology , Textile Science , Textile Sciences and Engineering (Other)

Journal Section

Research Article

Authors

Kemal Şahin Tunçel ^*
0000-0001-5095-6543
Türkiye

Publication Date

June 3, 2025

Submission Date

January 8, 2025

Acceptance Date

February 16, 2025

Published in Issue

Year 2025 Volume: 28 Number: 2

DOI

https://doi.org/10.17780/ksujes.1615990

IZ

https://izlik.org/JA34LL89TY

Cite

RIS / Bibtex

APA

Tunçel, K. Ş. (2025). KİMYASAL MODİFİKASYON SONRASI TERMAL OLARAK STABİLİZE EDİLEN VİSKOZ RAYON LİFLERİN YAPISAL ANALİZİ. Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi, 28(2), 823-834. https://doi.org/10.17780/ksujes.1615990