Polymers with high internal free volume

• US 20040170775A1
• Filed: 01/26/2004
• Published: 09/02/2004
• Est. Priority Date: 08/21/2000
• Status: Active Grant

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: Zhu, Zhengguo, Swager, Timothy M., Long, Timothy M.
• Granted Patent: US 7,494,698 B2
• Time in Patent Office: Days
• US Class Current: 428/1.1
• CPC Class Codes: C08G 61/02 Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes
• CPC Class Codes: C08G 61/10 only aromatic carbon atoms, e.g. polyphenylenes
• CPC Class Codes: C08G 61/12 Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
• CPC Class Codes: C08L 101/12 characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity liquid crystal materials or compositions C09K19/00
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 19/38 Polymers
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: H01B 1/12 organic substances organic macromolecular compounds or compositions C08
• CPC Class Codes: H01L 21/02118 carbon based polymeric organic or inorganic material, e.g. polyimides, poly cyclobutene or PVC polymers per se C08G, photoresist per se G03F
• CPC Class Codes: H01L 21/312 Organic layers, e.g. photoresist H01L21/3105, H01L21/32 take precedence; photoresists per se G03C
• CPC Class Codes: H10K 85/154 Ladder-type polymers
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/653 comprising only oxygen as heteroatom

Abstract

Shape-persistent organic materials, including polymers, with large degrees of interior free volume are described, along with behaviors and phenomena enabled by their unique properties. One class of such a material is built up from triptycene base moieties wherein three benzene rings are bridged together about a [2.2.2] tricyclic ring system. These units can be assembled into discreet molecules and polymers. These materials and/or formulations thereof with liquid crystals or polymers are useful for the complexation of chemicals and/or polymers; they have very low dielectric constants for use as coatings in dielectric circuits, they provide additional ordering mechanisms in liquid crystals, and they display unusual mechanical responses when subjected to electrochemical, chemical, or mechanical stimuli.

Claims

1. A composition comprising:

a ladder polymer or oligomer comprising an iptycene.

11. A composition as in claim 1, having a lowest energy state in which the polymer has a backbone the contains a plane.

12. A composition as in claim 11, including a plurality of aromatic rings that each align normal to the plane in the lowest energy state, and the polymer has a minimum dimension, measured as van der Waals contact dimensions, of 6.0 Å

.

13. A composition as in claim 1, the polymer including a backbone comprising backbone atoms bonded to other backbone atoms, wherein bonds involving the backbone atoms are not freely rotatable.

14. A composition as in claim 1, comprising a structure:

16. A composition as in claim 1 where in the backbone is composed of triptycene units.

23. A composition as in claim 1 comprising a dendritic structure.

24. A composition as in claim 1 wherein the polymer has cyclic sub-units.

25. A composition as in claim 1 which, in a solid state, has at least 30% free volume and a dielectric constant of about 1.9 or less.

26. A composition as in claim 1 which, in a solid state, has at least 50% free volume and a dielectric constant of about 1.7 or less.

27. A composition as in claim 1 which, in a solid state, has at least 70% free volume and a dielectric constant of about 1.5 or less.

28. A composition as in claim 1 which, in a solid state, has at least 90% free volume and a dielectric constant of about 1.2 or less.

30. A composition as in claim 1, comprising a first porous polymeric component and further comprising a second polymeric component forming an interpenetrating network permeating the pores of the first porous polymeric component.

2. A composition comprising an iptycene, having a molecular weight in excess of 2000 daltons, comprising a shape persistent molecule containing bridgehead atoms, with molecular structures radiating from the bridgehead atoms in three directions and extending outwardly therefrom such that each defines a van der Waals contact of furthest point from the bridgehead atoms of no less than 3.5 Å

.

3. A composition as in claim 2, comprising a linear polymer comprising an iptycene.

4. A composition as in claim 2, arranged as a dielectric material in an electronic component.

5. A composition as in claim 2, wherein the molecular structures that radiate from the bridgehead atoms extend outwardly therefrom such that each defines a van der Waals contact of furthest point from the bridgehead atoms of no less than 4.0 Å

.

6. A composition as in claim 2, wherein the molecular structures that radiate from the bridgehead atoms extend outwardly therefrom such that each defines a van der Waals contact of furthest point from the bridgehead atoms of no less than 4.5 Å

.

7. A composition as in claim 2, wherein the molecular structures that radiate from the bridgehead atoms extend outwardly therefrom such that each defines a van der Waals contact of furthest point from the bridgehead atoms of no less than 5.0 Å

.

8. A composition as in claim 2, wherein the molecular structures that radiate from the bridgehead atoms extend outwardly therefrom such that each defines a van der Waals contact of furthest point from the bridgehead atoms of no less than 5.5 Å

.

9. A composition as in claim 2, wherein the molecular structures that radiate from the bridgehead atoms extend outwardly therefrom such that each defines a van der Waals contact of furthest point from the bridgehead atoms of no less than 6.0 Å

.

10. A composition as in claim 2, wherein the molecular structures that radiate from the bridgehead atoms extend outwardly therefrom such that each defines a van der Waals contact of furthest point from the bridgehead atoms of no less than 6.2 Å

.

15. A composition as in claim 2, wherein the bridgehead atoms comprise carbon or nitrogen.

17. A composition as in claim 2 comprising a branched structure.

18. A composition as in claim 2 comprising a hyperbranched structure.

19. A composition as in claim 18, comprising polymer chain units comprising chemical functionality allowing formation of grafts.

20. A composition as in claim 18, comprising a grafted polymer including non-iptycene units grafted onto polymer chain units.

21. A composition as in claim 18, comprising a grafted polymer including iptycene units grafted onto polymer chain units.

22. A composition as in claim 18, comprising a polymer of monomer units each including two reactive sites, one of which has reacted with another monomer unit to form the polymer backbone, and another of which is available for grafting after formation of the polymer.

29. A composition as in claim 2 wherein the polymer has a backbone defined by non-iptycene units, and comprises iptycene units connected to the backbone.

31. A composition comprising a first component comprising a first, porous, shape persistent polymeric component and a second polymeric component forming an interpenetrating network permeating the pores of the first polymeric component.

32. A composition as in claim 32 wherein the second component is an elastomer.

33. A composition as in claim 32 wherein the second component is a conjugated polymer.

34. A composition as in claim 32 wherein the material shows a negative Poisson'"'"'s ratio when elongated.

35. A device comprising:

a chromophore comprising an iptycene, the device constructed and arranged to be capable of moving the chromophore from a first orientation to a second orientation upon application to the chromophore of a source of external energy.

36. A device as in claim 35, wherein the source of external energy is an electric, magnetic, optical, acoustic, electromagnetic, or mechanical field.

37. A device as in claim 35, wherein the device is constructed and arranged to change the polarization of the chromophore'"'"'s optical, magnetic, or dielectric absorptions upon application of the external energy source.

38. A device as in claim 35, constructed and arranged to display a change in color upon application of the external energy source.

39. A device as in claim 35, constructed and arranged to display a change in luminescence upon application of the external energy source.

40. A device as in claim 35, constructed and arranged to display a change in transmission of an optical signal upon application of the external energy source.

41. A device as in claim 35, wherein the chromophore bonded to the iptycene can be switched from a first low-energy, stable orientation to a second, low-energy, stable orientation upon application of the external energy source.

42. A device as in claim 35, constructed and arranged to impart polymerization to the iptycene upon application of the external energy source.

43. A device as in claim 35, constructed and arranged to display a signal recognizable to a human upon application of the external energy source.

44. A device as in claim 43, wherein the signal is a hologram.

45. A device as in claim 35, wherein application of the external energy source causes switching in a liquid crystal display.