کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10603284 | 982474 | 2013 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydroxypropyl methylcellulose substituent analysis and rheological properties
ترجمه فارسی عنوان
تجزیه و تحلیل جایگزین هیدروکسی پروپیل متیل سلولز و خواص رئولوژیکی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
The methyl and hydroxypropyl substituents in hydroxypropyl methylcellulose (HPMC) affect the resulting gel properties. These substituents in five HPMC gels were characterized using Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, small-amplitude oscillatory shear measurements, and differential scanning calorimetry (DSC). In FT-IR spectra, the most intense peak appeared at 1053Â cmâ1, denoting the presence of the glucose ring. The ratio of peak intensities at 1452Â cmâ1, which represents CH absorptions, and at 1053Â cmâ1 (I1452/I1053) and percent methylation from gas chromatography exhibited a linear association (r2Â =Â 0.6296). The broadening of the Raman spectra indicated that the relative crystallinity of HPMC decreases with increasing hydroxypropyl contents. DSC showed no linear relationship between the percent hydroxypropylation in HPMC and the percentage of free water in an HPMC gel. Small-amplitude oscillatory shear measurements revealed that the formation of an entanglements networks and/or weak gel depends on substituent contents.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 98, Issue 1, 15 October 2013, Pages 276-281
Journal: Carbohydrate Polymers - Volume 98, Issue 1, 15 October 2013, Pages 276-281
نویسندگان
Hannah Akinosho, Samantha Hawkins, Louise Wicker,