Organic polymers with near-zero uniaxial thermal expansion coeff

Details Organic polymers with near-zero uniaxial thermal expansion coeff Organic polymers with near-zero uniaxial thermal expansion coeff

1974-12-30

1976-11-30

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

20415922, 260 96R, 260482B, 260482C, 260678, 260632Y, 260635Y, 428421, 526285, 526303, 526304, 526310, 526317, 526319, C08F 600, G08F 626

Patent

active

039948676

ABSTRACT:
There are provided processes and compositions for obtaining organic polymeric materials having near-zero uniaxial thermal expansion coefficients. According to one embodiment, an organic polymer having a negative uniaxial thermal expansion coefficient is treated by thermal processing under conditions sufficient to cause at least a portion of the polymer chains to become misaligned, thereby decreasing the magnitude of this thermal expansion coefficient to nearly zero. According to a second embodiment, one or more organic polymers having a negative uniaxial thermal expansion coefficient are combined with one or more materials having a positive thermal expansion coefficient to yield a composite material having a uniaxial thermal expansion coefficient which is nearly zero.
Useful in the practice of the invention are polyacetylenes having a negative macroscopic thermal expansion coefficient, which are obtained by the solid-state polymerization of crystalline monomers containing two or more conjugated acetylene groups.

REFERENCES:
patent: 2751628 (1956-06-01), Carpenter et al.
patent: 3852235 (1974-12-01), Krutchen
Polymer, 14 pp. 433-439 (1973).

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