Preparation and thermostability of cellulose nanocrystals and nanofibrils from two sources of biomass: rice straw and poplar wood
Preparation and thermostability of cellulose nanocrystals and nanofibrils from two sources of biomass: rice straw and poplar wood
复制标题
稻草和杨木两种生物质来源的纤维素纳米晶体和纳米原纤维的制备及其热稳定性
DOI：
10.1007/s10570-019-02683-8
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发表时间：
2019
期刊：
影响因子：
5.7
通讯作者：
Chen Dengyu
中科院分区：
文献类型：
--
作者：
Zhao Guomin;Du Jun;Chen Weimin;Pan Mingzhu;Chen Dengyu
摘要从两种生物质资源中分离得到两种类型的纳米纤维素（纤维素纳米晶体- cncs和纤维素纳米原纤维- cnfs）。对纳米纤维素的形貌、结晶度和热稳定性进行了系统的比较。由稻草（CNC-Rs）和杨木（CNC-Ps）经硫酸水解得到的cnc具有短棒状结构，CNC-Rs和CNC-Ps的平均直径分别为9.1 nm和11.4 nm。以稻秆（CNF-Rs）和杨木（CNF-Ps）为原料制备的cnf具有网状结构，平均直径分别为13.3 nm和18.5 nm。冷冻干燥后，CNCs和CNFs仍保持其纳米结构。CNFs和CNC-Ps由典型的纯纤维素i组成，而CNC-Rs由纤维素i组成。纳米纤维素的结构依次为CNC-Ps（72.9%）、> CNC-Rs（68.0%）、> CNF-Ps（56.4%）、> CNF-Rs（54.4%）。纳米纤维素的热稳定性与其来源生物质材料和制备方法有关，这导致了它们的尺寸、结晶度和硫酸盐基团的差异。杨木纳米纤维素的热稳定性略高于稻秆纳米纤维素。CNFs的热稳定性高于cnc。计算表观活化能(E)来评价降解过程。纳米纤维素hadec为85.17 ~ 101.98 kJ/mol， CNFs为94.92 ~ 108.76 kJ/mol。图形抽象
AbstractTwo types of nanocellulose (cellulose nanocrystals—CNCs and cellulose nanofibrils—CNFs) were isolated from two biomass resources. The morphology, crystallinity and thermal stability of the nanocelluloses were systematically compared in this paper. CNCs derived from rice straw (CNC-Rs) and poplar wood (CNC-Ps) by sulfuric acid hydrolysis had short rod-shaped structures and average diameters of 9.1 nm for CNC-Rs and 11.4 nm for CNC-Ps. CNFs derived from rice straw (CNF-Rs) and poplar wood (CNF-Ps) by grinding had web-network structures and average diameters of 13.3 nm for CNF-Rs and 18.5 nm for CNF-Ps. After freeze-drying, the CNCs and CNFs retained their nano structures. CNFs and CNC-Ps consisted of the typically pure celluloseI, while CNC-Rs consisted of celluloseIandII. TheCrIof the nanocellulose followed the order of CNC-Ps (72.9%) > CNC-Rs (68.0%) > CNF-Ps (56.4%) > CNF-Rs (54.4%). The thermal stability of the nanocellulose was correlated with their source biomass materials and preparation method, which led to the differences in their dimensions, crystallinity, and sulfate groups. Nanocellulose isolated from poplar wood showed the slightly higher thermal stability than that of nanocellulose from rice straw. CNFs exhibited the higher thermal stability than that of CNCs. The apparent activation energy (E) was calculated to evaluate the degradation process. The nanocellulose hadEof 85.17–101.98 kJ/mol for CNCs and 94.92–108.76 kJ/mol for CNFs.Graphic abstract