The crosslinkable or crosslinked polymer composition 20 wherein the monomeric or oligomeric polyene comprises at least one member selected from the group consisting of {HEAD ~ dicyclopentadiene}, tricyclopentadiene, {TAIL ~ norbornadiene}, norbornadiene dimer, hexahydronaphthalene and dimethanohexahydronaphthalene 
The crosslinkable or crosslinked polymer composition 20 wherein the monomeric or oligomeric polyene comprises at least one member selected from the group consisting of { HEAD ~ dicyclopentadiene } , tricyclopentadiene , { TAIL ~ norbornadiene } , norbornadiene dimer , hexahydronaphthalene and dimethanohexahydronaphthalene
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH