| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Ribitsch, Volker
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2018Optimization of the Catalyst and Membrane Performance by addition of various Additives for the alkaline Direct Ethanol Fuel Cell
- 2015Cellulose thin films from ionic liquid solutions
- 2013Functional patterning of biopolymer thin films using enzymes and lithographic methodscitations
- 2013Chitosan-Silane Sol-Gel Hybrid Thin Films with controllable Layer Thickness and Morphologycitations
- 2013Comparison study of TEMPO and phthalimide-N-oxyl (PINO) radicals on oxidation efficiency toward cellulosecitations
- 2013Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilizationcitations
- 2012Adsorption of carboxymethyl cellulose on polymer surfacescitations
- 2011Wettability and surface composition of partly and fully regenerated cellulose thin films from trimethylsilyl cellulosecitations
- 2011Deposition of silicon doped and pure hydrogenated amorphous carbon coatings on quartz crystal microbalance sensors for protein adsorption studiescitations
- 2009Electrokinetic properties of polypropylene-layered silicate Nanocomposite fiberscitations
- 2008Adsorption of chitosan on PET films monitored by quartz crystal microbalancecitations
- 2005Determination of the accessible carboxyl and amino end groups in structurally modified PA 6 using titration methods
- 2004Determination of dissociable groups in natural and regenerated cellulose fibers by different titration methodscitations
- 2004Determining the Surface Free Energy of Cellulose Materials with the Powder Contact Angle Methodcitations
- 2003Characterisation of modified polypropylene fibrescitations
- 2002Modifikacije PA 6 z NH3 plazmo
- 2000Analiza povrsine vlaken z mikroskopijo atomskih sil (AFM)
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article
Determination of the accessible carboxyl and amino end groups in structurally modified PA 6 using titration methods
Abstract
<p>Changes in fine structure of fiber-forming polymers influence the fiber morphology and consequently the surface properties which define their adsorption characteristics [ 10, 20, 22]. Another very important magnitude, which defines the adsorption behavior of the polymer, is the number of polymer accessible functional groups [10, 20]. In the present work, the adsorption characteristics of PA 6 fiber-forming polymers were structurally modified using temperature and phenol treatment. The influence of structural modifications on the content and accessibility of PA 6 end groups (-COOH, -NH2) was studied. The results of two titration techniques [19, 23] (potentiometric and complexometric titrations) and the standard iodine sorption method [12] are related to several characteristics of the fibers such as molecular mass, density, crystallinity and the amount of different structural modifications. It has to be noted that, to our knowledge, determining the correlation between the polymer fine structure and the accessibility of functional groups using titration methods is a new approach in the polymer research field. Results show an evidently good correlation between the PA 6 structural changes (degree of crystallinity, amount of crystallinity) and the quantity of accessible end groups. The quantity of accessible carboxyl and amino groups is decreased by an increase in the degree of crystallinity. Results of potentiometric titration were confirmed using a conventional "iodine-value" method. It can be concluded that the potentiometric titration is an appropriate tool for determining the influence of structural modifications on the content of accessible end groups of the PA 6 fibers. Unfortunately, the complexometric titration did not give good results due to the fact that PA 6 was not brought into the reactive - dissociable stage. The ion exchange reaction, on which this technique is based, was not possible.</p>