although still a minor component chemically crosslinking pco also has a direct impact on the thermomechanical properties e g modulus versus temperature through the establishment of a permanent network and indirectly through the morphological transitions discussed above revealing such effects by the use of dma fig2 shows plots of the tensile storage modulus e u2032 versus temperature for cured pcos prepared with varying amounts of dcp all of the pco samples are characterized by a solid like storage modulus about 1 7 gpa for temperatures below t u2212 70 u00b0 c with this modulus value being invariant to the crosslinking density for temperatures above t u2212 70 u00b0 c the apparent onset of t g in the pco samples e u2032 begins to decrease gradually to a level that is dependent on crosslink density but spanning 0 05 to 0 5 gpa the decrease in modulus with crosslinking in this temperature region can be understood from the results of the dsc and waxs that showed crosslinking reduces the degree of crystallinity of pco it is to be expected that the crystalline phase will function as both the fixing mechanism for shape memory and a means of controlling room temperature modulus over a full order of magnitude for temperatures nearing t 62 u00b0 c close to the melting temperature measured by dsc the storage modulus of neat pco begins to decrease sharply to about 2 mpa at the completion of melting at 71 u00b0 c as found with dsc this transition temperature is observed mechanically to decrease with increasing degree of crosslinking for temperatures greater than t m the modulus of neat pco trace i continues.