Thermal Isomerization of Poly(triallyl cyanurate) using a Dynamic Mechanical Method

Abstract

WE wish to report a difference in thermo-mechanical behaviour between poly(triallyl cyanurate) and poly (triallyl isocyanurate). In this work a modified torsional pendulum was used in which the vertical specimen shaft consisted of a braid of glass fibres which was impregnated with the polymeric material under investigation. In principle any changes in the mechanical rigidity of this composite would be reflected by changes in frequency of the freely oscillating inertial mass of the pendulum. By expressing the calculated rigidity modulus, G, relative to some arbitrary value, G₀, in each experiment, a relative rigidity parameter, G/G₀, ensued. This parameter partially overcame the difficulties which were inherent in defining the geometry of the system. Experimentally, the relative rigidity reduces to P₀²/P², where P₀ and P are the periods of oscillation at the reference and measured conditions, respectively. The applicability of the measurement of the dynamic mechanical properties of supported polymers to the study of chemical and physical transformations has been demonstrated previously^1–3.