Multielement characterization of metal-humic substances complexation by size exclusion chromatography, asymmetrical flow field-flow fractionation, ultrafiltration and inductively coupled plasma-mass spectrometry detection: A comparative approach

2006 ◽  
Vol 1129 (2) ◽  
pp. 236-246 ◽  
Author(s):  
E. Bolea ◽  
M.P. Gorriz ◽  
M. Bouby ◽  
F. Laborda ◽  
J.R. Castillo ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Size Exclusion ◽  
Comparative Approach ◽  
Field Flow Fractionation ◽  
Mass Spectrometry Detection ◽  
Inductively Coupled ◽  
Exclusion Chromatography ◽  
Plasma Mass Spectrometry

scholarly journals Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1034
Author(s):  
Martina Ussia ◽  
Giusy Curcuruto ◽  
Daniela Zampino ◽  
Nadka Tzankova Dintcheva ◽  
Giovanni Filippone ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Oxidative Degradation ◽  
Point Of View ◽  
Size Exclusion ◽  
Polyamide 11 ◽  
Inductively Coupled ◽  
Flight Mass Spectrometry ◽  
Exclusion Chromatography ◽  
Plasma Mass Spectrometry

The photo-oxidative degradation processes of bio-based PA11 nanocomposites containing montmorillonite (MMT) and the organo-modified Cloisite®30B were investigated to discriminate the influence of organo-modified components on the polymer durability. Indeed, despite the extensive studies reported, there are still ambiguous points to be clarified from the chemical point of view. To this aim, UV-aged materials were analyzed by Size Exclusion Chromatography (SEC), Inductively Coupled Plasma–Mass Spectrometry (ICP-MS) and Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS). This enabled determining changes in both chemical structure and Molar Masses (MMs) induced by light, heat and oxygen exposure. The addition of organo-modified nanoclays strongly affected the PA11 light durability, triggering the macromolecular chains scission due to the typical αH, Norrish I and II mechanisms. However, the main contribution in boosting the photo-oxidative degradation is induced by iron impurities contained into the clays. Conversely, thermo-oxidation process performed at 215 °C was unambiguously affected by the presence of the organo-modifiers, whose presence determined an enhancement of crosslinking reactions.

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