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US 12,735,815 B2Granted
Laser writing in ambient conditions for carbonization of synthetic polymers, including nanostructured polymers treated in alkaline media
AssigneesPolitecnico Di Torino 95%, Fondazione Istituto Italiano Di Technologia 5%
InventorsMarzia Quaglio, Giulia Massaglia, Eve Cecile J. Verpoorten, Candido Pirri
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Abstract
Synthetic polymers in membrane or film or bulk form (continuous or micro-/nanostructured, supported or self-standing), if exposed to solutions of alkali hydroxides, can be carbonised by CO2 laser writing under ambient conditions (without any inert gas in contact with the material), to obtain electrically conductive tracks and patterns.
Claims10
A process for carbonization of synthetic polymers which comprises:
- a) forming nano- or micro-structured films or fibres of said polymers;
- b) treating the fibres or films obtained in step a) with alkaline solutions of alkali hydroxides in C2-C4 alcohols with a treatment duration of from 10 minutes to 2 hours at room temperature;
- c) treating the fibres or films obtained in step b) with a CO2 laser in the presence of air, and at a temperature of about 20-25° C.;
- wherein the synthetic polymers are selected from polyvinyl chloride, polyvinyl alcohol, polyethylene, polyethylene terephthalate, polyethylene naphthalate, polystyrene, polypropylene, polycarbonates, nylon 6,6, polymethacrylates, urea-formaldehyde resins, melamine-formaldehyde resins, TEFLON, polylactate, polyurethanes, polyesters, fluorinated ethylene propylene copolymers, acrylonitrile butadiene styrene, polyacrylonitrile and polyvinylidene fluoride;
- and
- wherein the concentration of alkali hydroxides in the alkaline solutions of step b) ranges between 0.01 and 0.5M.
3 more elements
Dependencies are inferred from the claim text.