化学工程
结晶度
热稳定性
微晶纤维素
材料科学
差示扫描量热法
结晶
傅里叶变换红外光谱
分解
动力学
热重分析
作者
Mariana Alves Henrique,Wilson Pires Flauzino Neto,Hudson Alves Silvério,Douglas Ferreira Martins,Leandro Vinícius Alves Gurgel,Hernane da Silva Barud,Luís Carlos de Morais,Daniel Pasquini
标识
DOI:10.1016/j.indcrop.2015.06.048
摘要
Abstract Cellulose nanocrystals (CNs) were extracted from different sources by acid hydrolysis using H2SO4 and HCl. The thermal decomposition of resulting CNs was studied by thermogravimetric analysis (TGA). The kinetic parameters were determined using the Flynn–Wall–Ozawa (FWO) and Kissinger methods. CNs were also characterized by X-ray diffraction (XRD), Atomic Force Microscopy (AFM), elemental analysis (EA), Zeta Potential (ZP) and degree of polymerization (DP). The results of the XRD analysis showed different profiles, making it possible to differentiate cellulose I from cellulose II. The results obtained by the FWO method showed that cellulose II CNs had an increased activation energy (Ea) with conversion (α), while in CNs of cellulose I the Ea remained constant or decreased slightly. This difference between Ea values for the thermal decomposition of CNs was mainly attributed to different crystalline arrangements of cellulose I and cellulose II, and to the type of acid employed.
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