Polymer Materials Containing Dispersed Carbon Nanotubes

• US 20080207817A1
• Filed: 03/31/2005
• Published: 08/28/2008
• Est. Priority Date: 03/31/2005
• Status: Active Grant

• Current Assignee: Arkema France (Arkema), Centre National De La Recherche Scientifique
• Original Assignee: Arkema France (Arkema), Centre National De La Recherche Scientifique
• Inventors: El Bounia, Nour-Eddine
• Granted Patent: US 7,838,587 B2
• Time in Patent Office: Days
• US Class Current: 524/495
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 51/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C08L51/04, C08L51/06 take precedence
• CPC Class Codes: C08L 53/00 Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/139 Open-ended, self-supporting conduit, cylinder, or tube-type article
• CPC Class Codes: Y10T 428/24322 Composite web or sheet
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers

Abstract

The invention relates to a polymer material comprising 99 to 20 parts by weight of polymer(s), 0.1 to 80 parts by weight of carbon nanotubes, and 0.05 to 80 parts by weight of at least one type of dispersant selected from A-B-C, B-C and/or C-B-C block copolymers, wherein each block is bonded to the other by means of a covalent bond, C is a chemical and/or physical interaction with the polymer material and in preferably is miscible therwith, B is not miscible with the polymer material and with the block B and the glass transition temperature thereof. T_g is less than the polymer material use temperature, A is not miscible with the polymer material and with the blocks B and the block C and the T_g or the fusion temperature Tf is greater than the T_g of B.

Claims

1. Polymer material comprising:

99 to 20 parts by weight of polymers;

0.1 to 80 parts by weight of carbon nanotubes; and

0.05 to 80 parts by weight of at least one dispersant selected from A/B/C, B/C, C/B/C block copolymers or mixtures thereof in which;

each block is linked to another by means of a covalent bond or an intermediate molecule linked to one of the blocks via a covalent bond and to the other block via another covalent bond,

C provides an interaction of the chemical and/or physical type with the polymer material,

B is not miscible with the polymer material and with the block C, and its glass transition temperature T_g is below the usage temperature of the polymer material and

A is not miscible with the polymer material, the block B and the block C, and its T_g or its melting point T_m is above the T_g of B.

2. Material according to claim 1, in which the blocks C of the block copolymers are formed from PMMA syndiotactic to at least 60%.

3. Material according to claim 1, in which the blocks C of the block copolymers comprise reactive monomers.

4. Material according to claim 1, in which the T_g of the blocks B of the block copolymers is below 0°

C.

5. Material according to claim 4, in which the blocks B of the block copolymers comprise 1,4-polybutadiene.

6. Material according to claim 5, in which the dienes of the block B are hydrogenated.

7. Material according to claim 4, in which the block B consists of polybutyl acrylate.

8. Material according to claim 1, in which the T_g or the T_m of the blocks A is above 23°

C.

9. Material according to claim 8, in which A is polystyrene.

10. Material according to claim 1, in which the number-average molar mass of the dispersant is between 10 000 g/mol and 500 000 g/mol.

11. Material according to claim 1, in which the proportion of dispersant(s) is 1 to 35% per 99 to 65% of polymer respectively.

12. Material according to claim 1, in which the proportion of carbon nanotubes represents 0.1 to 30 parts by weight of the total mass of the polymer material.

13. Material according to claim 1, in which the carbon nanotubes have a diameter of between 0.4 and 50 nm and a length of between 100 and 100 000 times their diameter.

14. Material according to claim 1, in which the dispersant comprises at least one of the C/B/C or A/B/C block copolymers and at least one polymer selected from:

core-shell copolymers (E), functionalized elastomers, A/B block copolymers, ATBN or CTBN reactive rubbers.

15. Material according to claim 14, in which the dispersant includes at least one A/B/C block copolymer and at least one A/B block copolymer and/or at least one core-shell copolymer (E) and/or at least one ATBN or CTBN reactive rubbers and optionally an A/B block copolymer.

16. Material according to claim 1, in which all or part of the A/B/C triblock is replaced with a C/A/B/A/C and/or C/B/A/B/C pentablock.

18. Material according to claim 1, in which the polymer is selected from PA, PPE/PA, PS, ABS, PMMA, PC, epoxy-based polymers or PVDF-based polymers.

21. Material according to claim 1, in which C is miscible with said material.

22. Material according to claim 3, in which said reactive monomer is selected from glycidyl (meth)acrylate, tert-butyl(meth)acrylate or mixtures thereof.

23. Material according to claim 4, in which the T_g of the blocks B of the block copolymers is below −

20°

C.

24. Material according to claim 1, in which the T_g or the T_m of the blocks A is above 50°

C.

25. Material according to claim 1, in which the number-average molar mass of the dispersant is between 20 000 g/mol and 200 000 g/mol.

26. Material according to claim 1, in which the proportion of carbon nanotubes represents 0.5 to 20 parts by weight of the total mass of the polymer material.

27. Material according to claim 13, in which the carbon nanotubes comprise multi-walled nanotubes (MWNT) having a diameter being between 5 and 30 nm and their length being 0.3 μ

m or higher.

28. Material according to claim 13, in which the blocks A have a number-average molar mass between 10 000 g/mol and 500 000 g/mol.

17. (canceled)

19. (canceled)

20. (canceled)