کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5202109 | 1502914 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study on thermal degradation kinetics of cellulose-graft-poly(l-lactic acid) by thermogravimetric analysis
ترجمه فارسی عنوان
بررسی سینتیک تجزیه حرارتی سلولز گرافت پلی (ال-لاکتیک اسید) توسط تجزیه و تحلیل ترموگرافی
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
The thermal degradation of cellulose-graft-poly(l-lactic acid) at different heating rates in nitrogen was studied by thermogravimetric analysis (TGA) in the temperature range 20-550 °C. Nuclear magnetic resonance (NMR), wide-angle X-ray diffraction (WAXD), and differential scanning calorimetry (DSC) analyses were utilized to determine the microstructure and glass transition temperature of cellulose-graft-poly(l-lactic acid). The kinetic parameters were determined by using Friedman, Flynn-Wall-Ozawa, and Kissinger methods. Coats-Redfern method was used to investigate the probable degradation mechanism. The results indicated that the trend of activation energy of cellulose-graft-poly(l-lactic acid) increases with increasing the content of the poly(l-lactic acid) and the process of the non-spontaneous degradation stage, goes to a random nucleation with two nuclei on the individual particle mechanism, whose rate-controlling process could be described by conversion rate (α) (integral form 1/(1 â α)).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 99, January 2014, Pages 233-239
Journal: Polymer Degradation and Stability - Volume 99, January 2014, Pages 233-239
نویسندگان
Lin Dai, Lu-Ying Wang, Tong-Qi Yuan, Jing He,