کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7791899 | 1500651 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal degradation and stability of sodium hyaluronate in solid state
ترجمه فارسی عنوان
تخریب حرارتی و پایداری هیالورونات سدیم در حالت جامد
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
The kinetics and mechanism of depolymerisation of solid sodium hyaluronate at elevated temperatures and various pH have been investigated. Depolymerisation was found to be governed by random chain scission. The activation energy at neutral pH was found to be 127Â kJ/mol. The solid polymer was most stable at neutral pH. Results suggest the depolymerisation mechanism in solid- and solution state to be the same. Correlation of log intrinsic viscosity to log weight-average molecular weight was investigated to ensure high quality data for polymer size. Based on more than sixty hyaluronate samples spanning from 0.4 to 2.3Â MDa, it was concluded that a second order polynomial regression gives a better fit than the linear regression offered by classical Mark-Houwink-Kuhn-Sakurada description. This finding was supported by literature data and could be expanded to other simple, well behaving linear polymers, such as polystyrene and polyethylene.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 107, 17 July 2014, Pages 25-30
Journal: Carbohydrate Polymers - Volume 107, 17 July 2014, Pages 25-30
نویسندگان
Mikael Bjerg Caspersen, Johannes P. Roubroeks, Liu Qun, Huang Shan, Jytte Fogh, Zhao RuiDong, Kristoffer Tømmeraas,