US4255535A
Expired / Lapsed
US
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Organic polymers with near-zero uniaxial thermal expansion coefficients
Assignee: Honeywell International Inc
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Filing: 1978-12-15
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Granted: 1981-03-10
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Expires: 1998-12-15
Abstract
Abstract There are provided composites having near-zero uniaxial thermal expansion coefficients. One or more polyacetylenes having a negative uniaxial thermal expansion coefficient are uniaxially or biaxially oriented within one or more solid matrix materials having a positive thermal expansion coefficient to yield a composite material having a uniaxial thermal expansion coefficient which is nearly zero. The polyacetylenes are obtained by the solid-state polymerization of crystals of monomers containing at least one -C 3BOND C-C 3BOND C- grouping per molecule. Also provided are processes for producing the above-described composites.
Inventors
- 👤 Ray H. Baughman
- 👤 Edith A. Turi
- 👤 Anthony F. Preziosi
- 👤 Kwok-Chun Yee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:57
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; C; C08; C08F; C08F38/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
A process for preparing a composite having a near-zero uniaxial thermal expansion coefficient comprising uniaxially or biaxially orienting at least one highly chain-aligned polyacetylene, possessing a negative uniaxial thermal expansion coefficient, within a solid matrix material possessing a positive thermal expansion coefficient, said chain-aligned polyacetylene having its negative uniaxial thermal expansion coefficient, α 1 , given by α 1 =a 1 +b 1 t and said matrix material having its positive thermal expansion coefficient, α 2 , given by α 2 =a 2 +b 2 t; each being selected such that the ratio a 1 /b 1 approximately equals the ratio a 2 /b 2 ; "t" being temperature in the region of interest in °C.; wherein said polyacetylene is obtained by solid state polymerization of crystals of 2,4-hexadiyn-1,6-diol-bisphenylurethane, and said solid matrix material is polyvinylidene fluoride polymer having its positive thermal expansion coefficient given by the expression α 2 =1.01×10 -4 ° C. -1 +8.0×10 -7 ° C. -2 t, where "t" is temperature in °C.
Claim 2
Dependent Claim
167 words
A process for preparing a composite having a near-zero uniaxial thermal expansion coefficient comprising uniaxially or biaxially orienting at least one highly chain-aligned polyacetylene, possessing a negative uniaxial thermal expansion coefficient, within a solid matrix material possessing a positive thermal expansion coefficient, said chain-aligned polyacetylene having its negative uniaxial thermal expansion coefficient, α 1 , given by α 1 =a 1 +b 1 t and said matrix material having its positive thermal expansion coefficient, α 2 , given by α 2 =a 2 +b 2 t; each being selected such that the ratio a 1 /b 1 approximately equals the ratio a 2 /b 2 ; "t" being temperature in the region of interest in °C.; wherein said polyacetylene is obtained by solid state polymerization of crystals of 2,4-hexadiyn-1,6-diol-bisphenylurethane, and said solid matrix material is polyvinylidene fluoride polymer having its positive thermal expansion coefficient given by the expression α 2 =1.01×10 -4 ° C. -1 +8.0×10 -7 ° C. -2 t, where "t" is temperature in °C.
Claim 3
Dependent Claim
164 words
A composite having a near-zero uniaxial thermal expansion coefficient comprising at least one highly chain-aligned polyacetylene, possessing a negative uniaxial thermal expansion coefficient, being uniaxially or biaxially oriented within a solid matrix material, possessing a positive thermal expansion coefficient, said chain-aligned polyacetylene having its negative uniaxial thermal expansion coefficient, α 1 , given by α 1 =a 1 +b 1 t and said matrix material having its positive thermal expansion coefficient, α 2 , given by α 2 =a 2 +b 2 t; each being selected such that the ratio a 1 /b 1 approximately equals the ratio a 2 /b 2 ; "t" being temperature in the region of interest in °C.; wherein said polyacetylene is the solid state polymerization product of crystals of 2,4-hexadiyn-1,6-diol-bisphenylurethane and said solid matrix material is polyvinylidene fluoride polymer having its positive thermal expansion coefficient given by the expression α 2 =1.01×10 -4 ° C. -1 +8.0×10 -7 ° C. -2 t, where "t" is temperature in °C.
Claim 4
Dependent Claim
164 words
A composite having a near-zero uniaxial thermal expansion coefficient comprising at least one highly chain-aligned polyacetylene, possessing a negative uniaxial thermal expansion coefficient, being uniaxially or biaxially oriented within a solid matrix material, possessing a positive thermal expansion coefficient, said chain-aligned polyacetylene having its negative uniaxial thermal expansion coefficient, α 1 , given by α 1 =a 1 +b 1 t and said matrix material having its positive thermal expansion coefficient, α 2 , given by α 2 =a 2 +b 2 t; each being selected such that the ratio a 1 /b 1 approximately equals the ratio a 2 /b 2 ; "t" being temperature in the region of interest in °C.; wherein said polyacetylene is the solid state polymerization product of crystals of 2,4-hexadiyn-1,6-diol-bisphenylurethane and said solid matrix material is polyvinylidene fluoride polymer having its positive thermal expansion coefficient given by the expression α 2 =1.01×10 -4 ° C. -1 +8.0×10 -7 ° C. -2 t, where "t" is temperature in °C.
References Cited (Backward Citations)
US1963074A
Cited
US2741625A
Cited
GB971170A
Cited
US3313787A
Cited
DE1940691U
Cited
US3852235A
Cited
US3926897A
Cited
US3923622A
Cited
US3994867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |