US5122745A
Expired / Lapsed
US
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Method and apparatus for determining molecular dynamics of materials
Assignee: Dow Chemical Co
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Filing: 1989-07-28
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Granted: 1992-06-16
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Expires: 2009-07-28
Abstract
Abstract A method and apparatus for determining the effects of pressure and/or dissoved gas on the molecular dynamics in solids, such as glassy polymers, or gases sorbed by the solids, involves the use of nuclear magnetic resonance (NMR) spectroscopy wherein a pressure resistant sample cell is combined with an NMR probe which in turn is subjected to a magnetic field, a diffusion gas being injected into the sample cell under varying pressure with resultant NMR spectra being collected and correlated.
Inventors
- 👤 Patrick B. Smith
- 👤 David J. Moll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:41
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/30
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
109 words
Apparatus for use in determining pressure induced microscopic molecular dynamics in a material, said apparatus comprising: (a) a cell for accommodating therein a sample of said material; (b) means for obtaining NMR spectra of the material accommodated in said cell; (c) manifold means; (d) conduit means in communication with said cell and said manifold means; (e) a pressurized fluid source in communication with said manifold means; and (f) control means for placing said cell in communication with said fluid source, (g) said cell comprising an elbow having two arms, one of said arms being adapted for accommodation in an NMR probe, and being in communication with said conduit means.
Claim 2
Dependent Claim
109 words
Apparatus for use in determining pressure induced microscopic molecular dynamics in a material, said apparatus comprising: (a) a cell for accommodating therein a sample of said material; (b) means for obtaining NMR spectra of the material accommodated in said cell; (c) manifold means; (d) conduit means in communication with said cell and said manifold means; (e) a pressurized fluid source in communication with said manifold means; and (f) control means for placing said cell in communication with said fluid source, (g) said cell comprising an elbow having two arms, one of said arms being adapted for accommodation in an NMR probe, and being in communication with said conduit means.
Claim 3
Independent Claim
61 words
A method of determining molecular dynamics in a material, said method comprising: (a) enclosing a sample of said material in a pressure containment cell; (b) introducing a fluid under pressure into said cell; (c) subjecting said cell to a magnetic field of such intensity as to produce NMR spectra; (d) varying said pressure; and (e) collecting and correlating resultant NMR spectra.
Claim 4
Independent Claim
61 words
A method of determining molecular dynamics in a material, said method comprising: (a) enclosing a sample of said material in a pressure containment cell; (b) introducing a fluid under pressure into said cell; (c) subjecting said cell to a magnetic field of such intensity as to produce NMR spectra; (d) varying said pressure; and (e) collecting and correlating resultant NMR spectra.
Claim 5
Dependent Claim
18 words
The method of claim 2 including varying the temperature of said sample during the collection of said spectra.
Claim 6
Dependent Claim
15 words
The method of claim 2 including varying said pressure between about 0 and 50 atmospheres.
Claim 7
Dependent Claim
37 words
The method of claim 2 wherein said fluid is selected from the group of gas molecules having NMR active nuclei consisting essentially of 13 C , 1 H, 2 H, 29 Xe, 19 F, and 17 O.
Claim 8
Dependent Claim
25 words
The method of claim 2 wherein said material comprises a solid polymer in particulate form and wherein the NMR data are obtained on said polymer.
Claim 9
Dependent Claim
24 words
The method of claim 2 wherein said material is gas sorbed by said sample and the NMR data are obtained on said sorbed gas.
Claim 10
Dependent Claim
21 words
The method of claim 2 wherein said sample is plasticized with said fluid prior to the collection of said NMR spectra.
Claim 11
Independent Claim
69 words
A method of determining molecular dynamics in a material, said method comprising: (a) enclosing a sample of said material in a pressure containment cell; (b) inserting said cell in an NMR probe; (c) introducing a fluid under pressure into said cell; (d) subjecting said probe to a magnetic field of such intensity as to produce NMR spectra; (e) varying said pressure; and (f) collecting and correlating resultant NMR spectra.
Claim 12
Independent Claim
69 words
A method of determining molecular dynamics in a material, said method comprising: (a) enclosing a sample of said material in a pressure containment cell; (b) inserting said cell in an NMR probe; (c) introducing a fluid under pressure into said cell; (d) subjecting said probe to a magnetic field of such intensity as to produce NMR spectra; (e) varying said pressure; and (f) collecting and correlating resultant NMR spectra.
Claim 13
Dependent Claim
25 words
The method of claim 9 wherein said material is a solid polymer in particulate form and wherein the NMR data are obtained on said polymer.
Claim 14
Dependent Claim
24 words
The method of claim 9 wherein said material is gas sorbed by said sample and the NMR data are obtained on said sorbed gas.
Claim 15
Dependent Claim
11 words
The method of claim 9 wherein said probe contains deuterium nuclei.
Claim 16
Dependent Claim
14 words
The apparatus of claim 1 including pressure gauge means in communication with said cell.
Claim 17
Dependent Claim
11 words
The apparatus of claim 1 including shield means encircling said cell.
Claim 18
Dependent Claim
14 words
The apparatus of claim 1 including pressure gauge means in communication with said cell.
Claim 19
Dependent Claim
14 words
The apparatus of claim 1 wherein the pressure of said fluid source is variable.
Claim 20
Dependent Claim
18 words
The apparatus of claim 1 wherein said fluid source communicates with said conduit means externally of said bore.
Claim 21
Dependent Claim
12 words
The apparatus according to claim 1 wherein said fluid comprises a gas.
Claim 22
Dependent Claim
30 words
The apparatus of claim 1 including a vacuum source in communication with said manifold means, said control means being operable to place said cell in communication with said vacuum source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |