Objective
Direct fluorination (i.e. treatment with gaseous fluorine or fluorine-containing mixtures) is of significant importance for the surface modification of polymers. For example, this can lead to an enhancement of gas separation, barrier and adhesion properties of polymers. However, a fundamental understanding of the direct fluorination process remains scanty. Hence the main goal of the project is to develop the chemical-physical picture of the direct fluorination of glassy polymers and graft polymerization onto these fluorinated surfaces. The following glassy polymers will be studied:
polyvinyltrimethylsilane (PVTMS) and poly[1-(trimethylsilyl) propyne]
(PTMSP) and
poly(2,6-dimethyl-1,4-phenylene oxide) (poly(phenylene oxide) (PPO)) and
polyimide (PI). The research activities will be as follows:
preparation of starting polymeric samples: flat films and membranes (flat
and hollow fiber shape);
the modification of polymeric samples by direct fluorination and graft
polymerization;
the influence of treatment conditions (fluorination duration, composition
and partial pressures of the components of fluorinating mixture, nature of
the grafted monomer) will be investigated;
investigation of the physicochemical nature of fluorinated polymers by X-ray
photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry,
ultraviolet photoelectron spectroscopy, infrared spectroscopy, Raman
microscopy, and atomic force microscopy;
study of the dependence of the surface energy on treatment duration and on
composition and partial pressures of the components of the fluorinating
mixture;
investigation of the kinetics of the fluorinated layer formation and
evaluation of the thickness of the reaction zone between fluorinated and
untreated polymer layers;
measurement of the absorption spectra in the near UV and visible, specific
gravity and the dependence of the refraction index of PPO on wavenumber;
monitoring and identification of the radicals which are chain carriers and
development of the scheme of the elementary chain chemical reaction
pathways;
study of the kinetics of graft polymerization of monomers onto fluorinated
and oxyfluorinated polymers, and the resultant physico-chemical properties
of such grafted layers;
investigation of the influence of the direct fluorination on the
electrochemical properties of polymers when in contact with aprotic solvent;
investigation of the influence of
-(a) direct fluorination and
-(b) fluorination accompanied with graft polymerization on the gas
-transport properties (diffusivity, permeability, gas separation factor)
-of polymer membranes;
development of a theoretical model for the direct fluorination of polymers. Overall, a detailed mollar level understanding of the surface fluorination of glassy polymers is to be undertaken, which will then be applied to graft polymerization, gas separation membranes, and electrochemical behaviour.
Fields of science (EuroSciVoc)
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Coordinator
DURHAM
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.