MOLECULE-BASED MAGNETIC POLYMERS AND METHODS

• US 20120035330A1
• Filed: 10/12/2011
• Published: 02/09/2012
• Est. Priority Date: 09/07/2007
• Status: Active Grant

• Current Assignee: University of Akron
• Original Assignee: University of Akron
• Inventors: Han, Chang Dae, Huang, Wenyi
• Granted Patent: US 8,658,751 B2
• Time in Patent Office: Days
• US Class Current: 525/389
• CPC Class Codes: C08G 2261/1414 Unsaturated aliphatic units
• CPC Class Codes: C08G 2261/143 Side-chains containing nitrogen
• CPC Class Codes: C08G 2261/15 conjugated side-chains
• CPC Class Codes: C08G 2261/3422 conjugated, e.g. PPV-type
• CPC Class Codes: C08G 2261/344 containing heteroatoms
• CPC Class Codes: C08G 2261/376 of Fe, Co, Ni
• CPC Class Codes: C08G 61/12 Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
• CPC Class Codes: C08G 79/00 Macromolecular compounds obtained by reactions forming a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon with or without the latter elements in the main chain of the macromolecule
• CPC Class Codes: C08G 79/14 a linkage containing two or more elements other than carbon, oxygen, nitrogen, sulfur and silicon
• CPC Class Codes: C08G 83/00 Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
• CPC Class Codes: C08J 2300/206 Star polymers
• CPC Class Codes: C08L 65/00 Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain C08L7/00 - C08L57/00, C08L61/00 take precedence; Compositions of derivatives of such polymers

Abstract

Molecule-based magnetic polymers with reasonably high Curie temperature and methods of preparing are provided. In particular, magnetic polymers having repeating units of an organometallic monomer covalently bonded to a monomer having a plurality of unpaired electrons are disclosed. Intrinsically homogeneous magnetic fluids (liquid magnets) and methods of preparing are also provided.

Claims

1. A magnetic polymer of the formula:

2. The magnetic polymer of claim 1, wherein m is 4 and n is 6.

3. The magnetic polymer of claim 2, wherein M is iron.

4. The magnetic polymer of claim 1, further characterized in that the magnetic polymer is devoid of magnetic particles.

5. A method of preparing a magnetic polymer, the method comprising the steps of:

(a) preparing an organometallic monomer;

(b) preparing a monomer having a functional group that polymerizes with the organometallic monomer;

(c) reacting the organometallic monomer of (a) with the monomer of (b), to yield an electron-donating polymer; and

(d) reacting the electron-donating polymer of step (c) with an electron acceptor, thereby directly bonding the electron acceptor to the organometallic unit of the reaction product of step (c), thereby producing an electron donor-acceptor magnetic polymer.

6. The method claim 5, wherein the electron donor-acceptor magnetic polymer is devoid of magnetic particles.

7. The method of claim 5, wherein, in said step (a) the organometallic monomer contains a triple bond.

8. The method of claim 7, wherein, in said step (a) the organometallic monomer contains a metallocene.

9. The method of claim 8, wherein, in said step (a) the organometallic monomer contains flexible side chains.

10. The method of claim 9, wherein, in said step (a) the organometallic monomer contains an aldehyde (CHO) group.

11. The method of claim 10, wherein, in said step (b) the functional group of the monomer is an azide group, and the azide group reacts with the aldehyde group in step (c) such that electron-donating polymer contains a carbon-nitrogen double bond (C═

N).

12. The method of claim 11, wherein, in said step (a) the organometallic monomer contains a metallocene, and, in step (d), the electron acceptor is directly bonded to the metallocene.

13. The method of claim 12, wherein the electron acceptor is tetracyanoethylene (TCNE).

14. The method of claim 5, wherein, in said step (a) the organometallic monomer contains flexible side chains.

15. The method of claim 5, wherein, in said step (a) the organometallic monomer contains an aldehyde (CHO) group.

16. The method of claim 5, wherein, in said step (b) the functional group of the monomer is an azide group.

17. The method of claim 5, wherein, in said step (b) the functional group of the monomer is an azide group, and step (c) is achieved through the aza-Wittig reaction.