کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10603178 | 982468 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of molecular weight on thermoreversible gelation and gel elasticity of methylcellulose in aqueous solution
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of molecular weight on thermoreversible gelation and gel elasticity of methylcellulose in aqueous solution Effects of molecular weight on thermoreversible gelation and gel elasticity of methylcellulose in aqueous solution](/preview/png/10603178.png)
چکیده انگلیسی
Aqueous solutions of two methylcellulose (MC) polymers with different molecular weights (Mw=100,000 and 400,000) have been studied. The thermoreversible gelation `properties and the gel elasticity were measured as a function of polymer concentration by means of micro differential scanning calorimetry and rheology, respectively. The experimental results prove that the aqueous solutions of MC are completely thermoreversible and the thermoreversibility of MC is independent of either polymer concentration or molecular weight. The total enthalpy required for the sol-gel transition is a linear function of polymer concentration, which is again independent of molecular weight. The quasi-equilibrium modulus Ge could be scaled with concentration c as Geâ¼c2.19 (c>1.0Â wt%) and Geâ¼c3.12Â (c<1.0Â wt%) for the high molecular weight MC, while Geâ¼c3.12 and (c<1.0 wt%)for the low molecular weight MC. At the same concentration of MC, with increasing molecular weight, Ge increases while the heat absorbed during the sol-gel transition remains constant.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 62, Issue 3, 1 December 2005, Pages 232-238
Journal: Carbohydrate Polymers - Volume 62, Issue 3, 1 December 2005, Pages 232-238
نویسندگان
Qiqiang Wang, Lin Li,