《Table 2 Crystallinity and crystal size of pulp and nanocellulose products》

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《Comparable Characterization of Nanocellulose Extracted from Bleached Softwood and Hardwood Pulps》

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Fig.6 shows the TGA and DTG curves of pulp and nanocellulose samples.The corresponding thermal degradation onset temperature（Ton）and maximumdecomposition temperature（Tmax）for all the samples are given in Table 3.Compared with aspen pulp，the thermal stability of Aspen F was clearly improved as evident from the increased value of Ton，and the increase was attributed to the removal of hemicellulose and part of amorphous regions of cellulose during FAhydrolysis[13，15]；however，the Ton and Tmax values of Aspen T and Aspen S were obviously lower compared with aspen pulp（Table3）mainly due to the fact that the carboxyl and sulfate groups introduced on the surface of CNCproducts reduced the activation energies of the degradation of cellulose[14]；thus，the thermal stability of pulp and nanocellulose products could be sorted in an ascending order:Aspen S