Strain Energy

In a molecule, strain energy is released when the constituent atoms are allowed to rearrange themselves in a chemical reaction or a change of chemical conformation in a way that:

  • angle strain,
  • torsional strain,
  • ring strain and/or steric strain,
  • Allylic strain, and
  • pentane interference

are reduced. The external work done on an elastic member in causing it to distort from its unstressed state is transformed into strain energy which is a form of potential energy. The strain energy in the form of elastic deformation is mostly recoverable in the form of mechanical work.

For example, the heat of combustion of cyclopropane (696 kJ/mol) is higher than that of propane (657 kJ/mol) per methylene unit. Compounds with unusually large strain energy include tetrahedranes, propellanes, cubanes, fenestranes and cyclophanes.

Other articles related to "strains, strain, energy, strain energy":

Diffusionless Transformation - Classification and Definitions
... transformations dominated by lattice-distortive strains and those where shuffles are of greater importance ... Homogeneous lattice-distortive strains, also known as Bain strains, are strains that transform one Bravais lattice into a different one ... This can be represented by a strain matrix S which transforms one vector, y, into a new vector, x This is homogeneous as straight lines are transformed to new straight lines ...
Stranski–Krastanov Growth - Modes of Thin-film Growth
... the bulk chemical potential of the adsorbate material, is the desorption energy of an adsorbate atom from a wetting layer of the same material, the desorption energy of an ... In the limit of small strains, the criterion for a film growth mode is dependent on ... differential μ, non-trivial amounts of strain energy accumulate in the deposited layers ...
Castigliano's Method
... of a linear-elastic system based on the partial derivatives of the Energy principle structures, he is known for his two theorems ... easy to understand by recalling that a change in energy is equal to the causing force times the resulting displacement ... Therefore, the causing force is equal to the change in energy divided by the resulting displacement ...
Spinodal Decomposition - Coherency Strains
... modulation, mechanical work has to be done in order to strain the rigid lattice structure ... We calculate the elastic strain energy for a cubic crystal by estimating the work required to deform a slice of material so that it can be added coherently to an existing slab of cross-sectional area ... after addition of the slab, it must be subjected to a strain δ in the z' and y' directions which is given by In the first step, the slice is deformed hydrostatically in order to ...

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    George Bernard Shaw (1856–1950)