2.3. Theoretical description of the poly-addition reaction
HTPB and IPDI react via polyaddition. The reaction can
be described by a second order reaction as the two NCO
groups of the di-isocyanates exhibit different reactivity
[16]. In [2], the reaction kinetics of PUR formation is also
described in detail for the reaction of di-isocyanates and
diols; this model is applied to our experiments while
adjusting the kinetic constants.