Abstract
The solid-state polymerization process of a diacetylene is investigated by neutron scattering. In contrast to x rays, neutrons do not induce polymerization and a detailed examination is possible in the autocatalytic region of the thermally activated polymerization process. In this region there appear diffuse sheets of diffracted intensity, split into doublets, which correspond to the one-dimensional propagation of the conversion. The Bragg reflections broaden, decrease, and also display multiple peaks. An Ising model for the limit of uncorrelated chains is compared to experiment. Above the 50%-conversion level the onset of chain interaction becomes visible. Preliminary data were obtained concerning the behavior of acoustic phonons and the structural phase transformation under the influence of polymerization.
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