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Organic polymers with near-zero uniaxial thermal expansion coefficients
Organic polymers with near-zero uniaxial thermal expansion coefficients
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机译:单轴热膨胀系数接近零的有机聚合物
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摘要
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.tbd.C--C.tbd.C-- grouping per molecule. Also provided are processes for producing the above-described composites.
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