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1. WO2020109855 - FABRICATION DE COMPOSITES DE CARBURANTS THERMIQUES SOLAIRES POLYMÈRES APPLICABLES EN TANT QUE STFF, STFI, STEG, STFP

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Fabrication of polymeric solar thermal fuel composites applicable as STFF, STFI,

STEG, STFP

Claims

1 . Fabrication of polymeric solar thermal fuel composites applicable as STFF, STFI, STEG, STFP which is consisted of following components:

a. Fillers or Nano filler or micro filler

b. polymeric substrates

c. photoswitchable materials

2. photoswitchable materials such as modified azobenzene molecules are dispersed in polymeric substrates.

3. According to claims 2, photoswitchable materials such as azobenzene molecules are modified with filler or nanofillers.

4. According to claims 2, the loading of photoswitchable materials such as azobenzene molecules is carried out in two ways: polymer solution or melt mixing.

5. Given claims 2, photoswitchable materials such as azobenzene molecules are modified with filler or nanofillers by establishing a covalent bond in the esterification process.

6. According to claims 3, filler or nanofillers used for modifying photoswitchable materials such as azobenzene molecules are as follow:

a. Carbon materials such as nanotubes, Graphene, Graphite, Carbon Black

b. Calcium carbonate

c. Barium sulfate

d. Sodium sulfate

e. clays

7. According to claims 6, the fillers or nanofillers are characterized by a particle size between 5 pm and 5 nm.

8. According to claims 6, the fillers or nanofillers should be modified by carboxyl function group

9. Based on claims 7, weight percent of carboxyl groups on the filler or nanofiller ranges 1 % -5%

10. In confirmation of claims 3, nano-fillers so-called Multi-Walled Carbon Nanotubes (MWCNT) are used.

1 1 . According to claims 3, the purity of the multi-walled carbon nanotubes is 95%, and its length ranges 10-20 pm, and the average inside and outside diameter of the carbon nanotubes varies 7 nm to 13 nm.

12. According to claims 1 , the polymeric substrate consists of the combination of polymers with a glass transition temperature less than 10 ° C as follow:

a. Ethylene vinyl acetate,

b. Polymer & copolymer of propylene,

c. Polymer & copolymer of ethylene

d. Poly (styrene-butadiene-styrene)(SBS) & poly (styrene-ethylene-butylene- styrene)(SEBS)

e. Polyethylene glycol

f. Polybutadiene

g. Polyethylene terephthalate

h. TPU polymer (Thermoplastic polyurethane)

i. Polyisoprene

j. Polyurethane

k. Polyvinyl Chloride (PVC)

L. Polyvinylidene fluoride (PVDF)

m. Polychloroprene

n. Polyvinylpyrrolidone

p. Poly-Caprolactone

q. Polypropylene glycol

13. According to claims 1 , azobenzene molecules are functionalized with the hydroxyl group or organic photoswitchable materials such as Azobenzene molecules, spiropyran, Diarylethene, spirooxazine, Fulgid and all materials based on photoswitchable molecules can be used.

14. According to claims 3, Azobenzene molecule ( 4- (4-nitrophenylazoyl) -phenol ) is used as azobenzene molecule with the hydroxyl group, although the synthesis of other azobenzene molecules having a hydroxyl functional group in their structure is possible, so it falls within the scope of this invention.

15. According to claims 3, loading process of the azobenzene materials such as 4- (4-nitrophenylazoyl) -phenol molecule modified with multi-walled carbon nanotubes(MWCNT) was performed with polymer solution method, although loading azobenzene molecules modified with fillers or nanofillers by melt-mixing method falls within the scope of this invention.

16. According to claims 9 and 1 1 , in case of using multi-walled carbon nanotubes as an example of nanofillers, nanoparticles are dispersed in dimethylformamide (DMF) to open nanoparticulate multi-walled carbon nanotubes using an ultrasonic device at a frequency of 30 to 80 kHz.

17. According to claims 10,1 1 and 13, in case of using 4- (4-nitrophenylazoyl) -phenol as Azobenzene molecule and using multi-walled carbon nanotubes as nanofillers, 4- (4-nitrophenylazoyl) -phenol is dissolved in a DMF solvent with a purity of 95%, and then the DMF and Azobenzene solution are added to the multi-wall carbon nanotubes and sulfuric acid is added to the mixture with a purity of 98% as a catalyst.

18. According to claims 5, time period needed for esterification reactions is 1 -2 hours.

19. At the end of synthesis, Azobenzene materials modified by nano-fillers are separated by using a vacuum filtration set with a pore diameter of between 0.02 and 0.45 pm.

20. At the end of synthesis to remove exceeded azobenzene molecules, solvents such as methanol, acetone, ethanol, tetrahydrofuran, and preferably acetone, are used, and an additional amount of azobenzene molecule is separated using centrifuge in 8500 rpm for 10 minutes.

21 . According to claims 14, after dry-washing in an ultrasonic apparatus with a frequency of 30 to 80 kHz, multi-walled nanotubes functionalized with azobenzene molecule is dispersed in tetrahydrofuran (THF) solvent.

22. According to claims 14, the concentration of azobenzene modified with nano-filler in the solvent ranges 0.005 - 0.1 g/ ml and the polymeric substrates also are separately dissolved in the same solvent, and the polymer concentration is in the solvent is preferably 0.05 to 0.1 g/ml, and polymer is dissolved for 2 to 4 hours.

23. According to claims 22, the Azobenzene modified with nanofillers dispersed in the solvent is added to the polymeric solution and then Azobenzene modified with nanofillers and polymer is placed in the ultrasonic device for 1 to 2 hours. The solvent tetrahydrofuran (THF) in the Azobenzene modified with carbon nanotubes, dispersed in the polyethylene vinyl acetate, evaporated, and the nano-composite film is produced using a press machine as a uniform film.

24. According to claims 1 , in the present invention, the Internal mixing machine with 60RPM for the melt-mixing method is used to produce polymeric solar thermal composite.

25. According to claims 23, the composite can be utilized as film, sheet, paint, thermoelectric generator or fibers.

26. According to claim 25, final consumer products can be manufactured as STFP (solar thermal fuel paints) in this process, photoswitchable compounds should be mixed with polymeric substrates which can be solved in commercial solvents.

27. According to claim 25, final consumer products can be manufactured as STFFI (solar thermal fuel fibers) in this process, photoswitchable compounds should be mixed with polymeric substrates and be produced by fiber spinning methods.

28. According to claim 25, final consumer products can be manufactured as STFF (solar thermal fuel films or sheets) in this process, photoswitchable compounds should be mixed with polymeric substrates and be produced by conventional film blowing, film casting, and sheet producing methods.

29. According to claim 25, final consumer products can be manufactured as STEG (solar thermoelectric generator) in this process, photoswitchable compounds should be mixed with

polymeric substrates and be produced as n-type and p-type multilayers films in thermoelectric generators.