Abstract
Abstract I. The unit cell parameters of deuterated pTS have been measured by neutron diffraction from 200 to 300 K and as a function of polymer content X from ≃0 to >95%, and the evolution with X of the thermal expansion tensor α has been calculated. The data yield information on the side groups displacement depending on X, and on the anisotropy of matrix response to chain creation. αb does not decrease smoothly with X, and shows a secondary maximum just at the beginning of the autocatalytic range. The expansion in the (a,c) plane is maximum around X = 30% and the corresponding principal axes rotate by about 20° to become aligned with the perpendicular to the molecule long axis.
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