Crosslink Density Determinations for Polymeric Materials

Chemical crosslinking of polymeric binders is possibly the most significantly factor affecting the mechanical behavior of unfilled and highly filled elastomers. There are basically two physical methods used by various investigators for experimentally determining the degree of crosslinking swelling method using Florys equation and the equilibrium stree-strain method. The procedure dicussed inthis report is recommended as a tentative standard procedure to be followed in the collection of equilibrium stress-strain data and in the use of these data in the determination of the effective crosslink density of polymeric binders and composite propellants.