From 5 different plant species distributed in Turkey (Festuca valesiaca L., Stipa pulcherrima subsp. epilosa (martinovsky) tzvelev, Asphodeline taurica (pall. ex m. bieb) endl., Juncus compressus jacq. ve Verbascum helianthemoides hub-mor.) cellulose isolation and characterization.

In this study, cellulosic fiber isolation was performed from four plant species (Festuca valesiaca, Stipa pulcherrima subsp. epilosa, Asphodeline taurica, Juncus compressus) and endemic Verbascum helianthemoides species that are widely distributed and grow naturally in Turkey. The chemical, physical and morphological properties of the isolated cellulose fibers were determined by FT-IR, TGA, XRD, SEM, elemental analysis. Cellulose ratios of plant species are Festuca valesiaca root 57.7%, Festuca valesiaca stem 44.49%, Asphodeline taurica 73.91%, Juncus compressus 43.51%, Stipa pulcherrima subsp. epilosa was found to be 59.36% and Verbascum helianthemoides was found to be 78.34%. Thermogravimetric analysis revealed that the degradation of cellulosic fibers obtained from all five plant species occurred in three stages, and it was determined that the maximum decaying temperatures occurred between 316.1 °C and 337 °C. The XRD results showed crystallinity indices of Festuca valesiaca stem 28.3%, Festuca valesiaca stem 30.7%, Asphodeline taurica 27.2%, Juncus compressus 27.2%, Stipa pulcherrima subsp. epilosa was calculated as 26.7% and Verbascum helianthemoides as 25.5 It has been observed that the fiber surfaces have a rough structure. According to the results of elemental analysis, the presence of the most oxygen, carbon and hydrogen elements in the fibers was determined sequentially. The results of this study have shown that cellulose fibers obtained from the plant species subject to the thesis have chemically, physically and morphologically similar properties and are suitable for potential cellulose-derived applications and the development of biocomposite materials.