Material comprising polyazacycloalkanes grafted onto polypropylene fibres method for production thereof and method for removal of metal cations from a liquid
A polypropylene fiber, azacycloalkane technology, applied in the field of materials, can solve problems such as no suggestion
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0162] Preparation of new materials
[0163] According to the invention, the principle of grafting polyazamacrocyclic, in particular tetraazamacrocyclic, molecules onto polypropylene fibers is based on free-radical polymerization on the polypropylene surface.
[0164] After heating the pre-irradiated polypropylene fibers, the free radicals generated initiate the polymerization reaction. The monomers used to prepare the materials of the invention, whether of the first or second embodiment, have, for example, styrenic units. According to the present invention, corresponding to the materials and methods of the first embodiment and the second embodiment, there are two approaches for fixing polyazamacrocycles, such as tetraazamacrocycles, to polypropylene, which are respectively:
[0165] - "direct" grafting: by polymerizing an entity, such as a styrenic entity, bearing a macrocycle, such as a tetraazamacrocycle;
[0166] - grafting of spacer arms by polymerizing functional monom...
Embodiment 1
[0257] Example 1 : Effect of various parameters on grafting polychloromethylstyrene onto polypropylene fibers
[0258] In this example, the effect of various parameters on the grafting of polychloromethylstyrene onto polypropylene fibers will be investigated.
[0259] These polypropylene fibers were in nonwoven form and were supplied by the Institut Francais du Textile et de L'Habillement (French Textile and Clothing Institute) after irradiation.
[0260] It should first be noted that the quality of grafting can be assessed both by elemental analysis of chlorine atoms and by measuring the weight gain of the material during grafting. Both evaluations agree when the fibers do not disintegrate (lose weight) during the grafting process. The results of grafting are given below, expressed as a function of chlorine content by choice.
[0261] 1A. Selection of solvent
[0262] Various studies mention the use of solvents such as methanol when grafting styrene onto polypropylene ...
Embodiment 2
[0282] Example 2 : Formation of a charge transfer complex between maleic anhydride and chloromethylstyrene
[0283] Formation of a charge-transfer complex in solution between maleic anhydride and chloromethylstyrene was demonstrated by NMR spectroscopy ( Figure 5 ). After stirring the two reactants under reflux of acetone for one hour, the NMR spectrum of the reaction medium showed the appearance of new obscured ethylenic signals for those corresponding to the free monomers.
[0284] The equilibrium of this reaction (Scheme 8) is shifted towards the free monomer, however, it is not the small amount of complex and its favorable polymerization that allows grafting on the polypropylene surface of the alternating copolymer.
[0285]
[0286] Diagram 8
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More