Abstract
AbstractThe lateral thermal motion of atoms in an inextensible polymer chain would cause a shortening along the chain direction. This effect could explain the observed negative thermal expansivity α along the chain direction of a polymer crystal. Using this idea, the expansivity α is calculated for a lattice of parallel linear chains. A value of −1.3 × 10−5 K is obtained for chains with a carbon backbone, in good agreement with data for polyethylene.
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