کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1198771 1493485 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Separation of maleic anhydride grafted polypropylene using multidimensional high-temperature liquid chromatography
ترجمه فارسی عنوان
جداسازی پلی پروپیلن پیوند شده آنیدرید منیزیم با استفاده از کروماتوگرافی مایع مادون قرمز چند بعدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• PP-g-MA were baseline separated into a functionalized and a non-functionalized portion by using HT-HPLC with silica gel (PerfectSil®) and Mica as stationary phase and a solvent gradient decalin → cyclohexanoneG–1 min at 140 °C.
• The separation by HT-HPLC was confirmed by offline hyphenating with FTIR.
• HT 2D-LC → IR shows that PP-g-MA contains ∼20% non-grafted homopolymer (i-PP) and ∼80% graft copolymer (PP-g-MA).

Functionalization addresses a property gap of polyolefins and opens new perspectives due to improved surface properties in applications like composites (e.g., glass fiber reinforced polypropylene) and anti-corrosive coatings for metals. Various techniques have been developed to characterize functionalized polyolefins, yet no analytical approach addressing their chemical heterogeneity exists. Using High Temperature Size Exclusion Chromatography (HT-SEC) coupled to infrared spectroscopy we could show for two model samples of polypropylene grafted maleic anhydride (PP-g-MA), differing in their nominal MA content, that the grafting density increases with decreasing molar mass. Crystallization Analysis Fractionation (CRYSTAF) does not enable to separate these samples according to their composition to the extent required. Yet, when using High Temperature High Performance Liquid Chromatography (HT-HPLC), with either silica gel or Mica as stationary phase and a gradient mobile phase, a deformulation into a grafted and a non-grafted fraction could be achieved. This was confirmed by analyzing the eluted fractions by infrared spectroscopy. Hyphenating the separation according to composition with a separation according to molar mass (HT-HPLC x HT-SEC) enabled for the first time to reveal the bivariate distribution of PP-g-MA with regard to the molar mass and composition. Using on-line infrared detection quantitative information on the compositional and molar mass parameters of the individual fractions could be obtained.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1441, 8 April 2016, Pages 96–105
نویسندگان
, , , , , , ,