Effect of TEMPO-oxidization and rapid cooling on thermo-structural properties of nanocellulose. (1st October 2017)

• Record Type: Journal Article
• Authors: Mhd Haniffa, Mhd Abd Cader; Ching, Yern Chee; Chuah, Cheng Hock; Yong Ching, Kuan; Nazri, Nik; Abdullah, Luqman Chuah; Nai-Shang, Liou
• Is Part Of: Carbohydrate polymers. Volume 173(2017)
• Page Start: 91
• Page End: 99
• Publication Date: 2017-10-01
• Subjects: Nanocellulose -- TEMPO-oxidation -- Rapid cooling -- Thermal stability -- Hydrogen bond energy -- TGA-DTG; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2017.05.084
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Cellulose nanofibrils (CNFs) were prepared from MCC using TEMPO-oxidation. Acid hydrolyzed nanocrystalline celluloses (NCCs) was treated with TEMPO-oxidation. Thermo-structural properties and thermogravimetric analysis of the nanocellulose were investigated with respect to rapid cooling treatment. Rapid cooling treatment improve thermo-structural properties of the nanocelluloses. TEMPO-oxidation and rapid cooling treatment contributes to the fabrication of NCCs with a high number of carboxyl entities and admirable thermal stability. Abstract: Recently, surface functionality and thermal property of the green nanomaterials have received wide attention in numerous applications. In this study, microcrystalline cellulose (MCC) was used to prepare the nanocrystalline celluloses (NCCs) using acid hydrolysis method. The NCCs was treated with TEMPO [(2, 2, 6, 6-tetramethylpiperidin-1-yl)oxy radical]-oxidation to prepare TEMPO-oxidized NCCs. Cellulose nanofibrils (CNFs) also prepared from MCC using TEMPO-oxidation. The effects of rapid cooling and chemical treatments on the thermo-structural property studies of the prepared nanocelluloses were investigated through FTIR, thermogravimetric analysis-derivative thermogravimetric (TGA-DTG), and XRD. A posteriori knowledge of the FTIR and TGA-DTG analysis revealed that the rapid cooling treatment enhanced the hydrogen bond energy and thermal stability of the TEMPO-oxidized NCC compared to other nanocelluloses. XRD analysis exhibits the effect of rapid cooling on pseudo 2I helical conformation. This was the first investigation performed on the effect of rapid cooling on structural properties of the nanocellulose.