Abstract
The frequencies of the active fundamental vibrations of 1–4 trans polybutadiene and of its symmetrical deutero-derivatives, viz. (CH 2CDCDCH 2) m , (CD 2CHCHCD 2) n and (CD 2CDCDCD 2) m , have been calculated by means of valence force constants derived from cyclo-olefins. The method for obtaining the kinetic and potential energy matrices for an isolated polymer chain is briefly discussed, and compared with a procedure previously presented in the literature. A detailed discussion of the i.r. spectrum of 1–4 trans polybutadiene, based on normal co-ordinate analysis, is given.
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