double bond

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Related to Double bonds: conjugated double bonds

dou·ble bond

a covalent bond resulting from the sharing of two pairs of electrons, for example, H2C=CH2 (ethylene).

dou·ble bond

(dŭb'ĕl bond)
A covalent bond resulting from the sharing of two pairs of electrons.

double bond,

n a covalent bond in which two valence (outer) electrons are contributed by each participating atom. See also covalent bond.
References in periodicals archive ?
The analysis of acrylates and methacrylates by NIR spectroscopy is based on the band of the first overtone of the C-H stretching vibration of the (meth) acrylic double bonds, which appears at 1620 nm.
Small concentrations are already sufficient to allow a direct reaction with double bonds of elastomers, e.
1] in the GMO spectra is related to the double bond [14].
Fatty acids differ in their chain length, number, position, and geometry (c/'s or trans) of their double bonds.
The high double bond character of these bonds also affects the C-N stretching frequencies of the infrared spectrum, which were shifted considerable towards higher frequency from the normal C-N region.
This result indicates that the reactivity of the carbocationic species generated during the polymerization process, which includes the initiating carbocations and chain propagating carbocations, were reactive enough to polymerize the vinylether groups of the VESFA, but not so reactive that they add to double bonds of the fatty acid portion of VESFA.
All the collected polymer samples contained terminal double bonds.
However, the method of decreasing the polymerization rate to reduce the thermal front is very limited, because the heat produced during polymerization is mainly dependent on the amount of double bonds reacted in the system; meanwhile, a proper polymerization rate is necessary for the injectable materials.
For this purpose, four divinyl monomers whose double bonds had different polymerization reactivity were designed, and then properties were calculated based on density functional theory (DFT) using standard B3LYP/6 - 31g(d), B3LYP/6 - 31 + g(d,p), and B3Iyp/6-311 + g(3df,2pd) method and basis set combinations.
has been granted a patent for an aqueous composition useful as an adhesive comprised of at least one halogenated olefin polymer, at least one high-functionality epoxy resin, and at least one diacid-modified resin that is different from the halogenated olefin polymer; wherein the diacid-modified resin is made by reacting one or more resins that contain carbon-carbon double bonds with one or more diacid or diacid-derivative small molecules with carbon-carbon double bonds.
Two of the links in the chain are the more rigid double bonds.