کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1198991 1493517 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Towards determination of absolute molar mass of cellulose polymer by size exclusion chromatography with mulitple angle laser light scattering detection
ترجمه فارسی عنوان
جهت تعیین توالی مولکول مولکولی سلولز با استفاده از اندازه گیری کروماتوگرافی با اندازه گیری پراکندگی نور لیزر
کلمات کلیدی
سلولز تریکوبانیلات، اندازه کروماتوگرافی حذف، درجه پلیمریزاسیون، ضریب دوم وییرال، افزایش معنی داری خاص، شاخه
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• Second virial coefficient and refractive index increment determined for cellulose CTC in THF analysed by SEC/MALLS/RI system.
• Significant impact of A2 on molecular weights values noted.
• Cellulose branching upon accelerated ageing excluded.

The study focuses on determination of a set of crucial parameters for molar mass calculation of cellulose from the results of size exclusion chromatography coupled with multiple angle laser light scattering (MALLS) and differential refractive index (DRI) detectors. In the present work, cellulose has been derivatised to obtain cellulose tricarbanilate (CTC) soluble in tetrahydrofuran (THF). The parameters of Rayleigh scattering in the MALLS detector: refractive index increment (dn/dc) and second virial coefficient (A2) of CTC in THF were determined for laser wavelength 658 nm. In order to avoid errors resulting from cellulose derivatisation by-products present in the CTC solution, the so called “on-line” method of measuring dn/dc and A2 was applied. Based on the A2 determination, its influence on cellulose molar mass calculations and cellulose molecular dimensions were critically assessed. The latter includes evaluation of artificially aged cellulose towards conceivable branching by conformation plot analysis.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1409, 28 August 2015, Pages 53–59
نویسندگان
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