کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5190155 | 1381199 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal degradation behaviors of spherical cellulose nanocrystals with sulfate groups
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A kind of spherical cellulose nanocrystals was prepared by hydrolysis of microcrystalline cellulose with mixed acid. In order to improve the thermal stability, two methods were used: diminishing the acid sulfate groups by desulfation and neutralizing them by using NaOH solution. The thermal degradation behaviors were characterized by thermogravimetric analysis and differential scanning calorimetry at nitrogen current. The results indicated that the degradation of cellulose nanocrystals with acid sulfate groups started at lower temperature and showed two remarkable pyrolysis processes. Profile analysis of the derivative thermogravimetric curves showed that each pyrolysis process was composed of multi-step reactions. When neutralized by NaOH solution, the degradation shifted to the higher temperature and occurred within a narrow temperature range. The influence of particle size of cellulose on degradation was also investigated. The results indicated that the degradation of cellulose with small size took place at lower temperature and facilitated the char residue formation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 48, Issue 12, 4 June 2007, Pages 3486-3493
Journal: Polymer - Volume 48, Issue 12, 4 June 2007, Pages 3486-3493
نویسندگان
Neng Wang, Enyong Ding, Rongshi Cheng,